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Explosions at Boston Marathon

Boston Marathon Explosions A police officer and a Federal Bureau of Investigation agent run as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

Boston Marathon Shooting Investigators stand outside an apartment complex where a man was fatally shot when a team of FBI agents swarmed his home early Wednesday, May 22, 2013, in Orlando, Fla. The FBI says the man, being questioned by authorities in the Boston bombing probe, was fatally shot when he initiated a violent confrontation. (AP Photo/John Raoux)

Boston Marathon Shooting Police officers block the entrance to an apartment complex where man was fatally shot, Wednesday, May 22, 2013, in Orlando, Fla. The FBI says the man, being questioned by authorities in the Boston bombing probe, was fatally shot when he initiated a violent confrontation. (AP Photo/John Raoux)

Ibragim Todashev This May 4, 2013 police mug provided by the Orange County Corrections Department in Orlando, Fla., shows Ibragim Todashev after his arrest for aggravated battery in Orlando. Todashev, who was being questioned in Orlando by authorities in the Boston bombing probe, was fatally shot Wednesday, May 22, 2013 when he initiated a violent confrontation, FBI officials said. (AP Photo/Orange County Corrections Department)

Boston Marathon Explosions Flowers are placed on the alleged burial site of Boston Marathon bombing suspect Tamerlan Tsarnaev in Doswell, Va., Friday, May 10, 2013. Tsarnaev's uncle Ruslan Tsarni said Tsarnaev was buried in the cemetery in Doswell, near RichmondVa. Tsarnaev was killed April 19 in a getaway attempt after a gunbattle with police. His younger brother, Dzhokhar, was captured later and remains in custody. (AP Photo/Luis M. Alvarez)

Boston Marathon Explosions Flowers are placed on the alleged burial site of Boston Marathon bombing suspect Tamerlan Tsarnaev in Doswell, Va., Friday, May 10, 2013. Tsarnaev's uncle Ruslan Tsarni said Tsarnaev was buried in the cemetery in Doswell, near RichmondVa. Tsarnaev was killed April 19 in a getaway attempt after a gunbattle with police. His younger brother, Dzhokhar, was captured later and remains in custody. (AP Photo/Luis M. Alvarez)

Boston Marathon Explosions Flowers are placed on the alleged burial site of Boston Marathon bombing suspect Tamerlan Tsarnaev in Doswell, Va., Friday, May 10, 2013. Tsarnaev's uncle Ruslan Tsarni said Tsarnaev was buried in the cemetery in Doswell, near RichmondVa. Tsarnaev was killed April 19 in a getaway attempt after a gunbattle with police. His younger brother, Dzhokhar, was captured later and remains in custody. (AP Photo/Luis M. Alvarez)

Peter Stefan, Ruslan Tsarni Ruslan Tsarni, right, uncle of killed Boston Marathon bombing suspect Tamerlan Tsarnaev, prepares to speak with reporters in front of the Graham, Putnam, and Mahoney Funeral Parlors, in Worcester, Mass., as funeral director and owner Peter Stefan, left, stands nearby, Sunday, May 5, 2013. Stefan has pleaded for government officials to use their influence to convince a cemetery to bury Tsarnaev, but so far no state or federal authorities have stepped forward. (AP Photo/Steven Senne)

Ruslan Tsarni, Peter Stefan Ruslan Tsarni, left, uncle of killed Boston Marathon bombing suspect Tamerlan Tsarnaev, departs the Graham, Putnam, and Mahoney Funeral Parlors, in Worcester, Mass., as funeral director and owner Peter Stefan, right, walks him to his car, Sunday, May 5, 2013. Stefan has pleaded for government officials to use their influence to convince a cemetery to bury Tsarnaev, but so far no state or federal authorities have stepped forward. (AP Photo/Steven Senne)

Peter Stefan, Ruslan Tsarni Ruslan Tsarni, right, uncle of killed Boston Marathon bombing suspect Tamerlan Tsarnaev, approaches members of the media, not shown, in front of the Graham, Putnam, and Mahoney Funeral Parlors, in Worcester, Mass., as funeral director and owner Peter Stefan, center, walks with him Sunday, May 5, 2013. Stefan has pleaded for government officials to use their influence to convince a cemetery to bury Tsarnaev, but so far no state or federal authorities have stepped forward. (AP Photo/Steven Senne)

Dias Kadyrbayev, Azamat Tazhayakov This courtroom sketch signed by artist Jane Flavell Collins shows defendants Dias Kadyrbayev, left, and Azamat Tazhayakov appearing in front of Federal Magistrate Marianne Bowler at the Moakley Federal Courthouse in Boston, Mass., Wednesday, May 1, 2013. The two college friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev, and another man, were arrested and charged with removing a backpack containing hollowed-out fireworks from Tsarnaev's dorm room. (AP Photo/Jane Flavell Collins)

Boston Marathon Explosions This photo released May 1, 2013 by the U.S. Attorney's office in a federal criminal complaint, shows fireworks, which the complaint said federal agents recovered from inside a backpack belonging to Boston Marathon bombing suspect Dzhokhar Tsarnaeva, found in a landfill in New Bedford, Mass. Three men who attended the University of Massachusetts at Dartmouth with Tsarnaeva, were charged Wednesday, May 1, 2013, in connection with the case. (AP Photo/U.S. Attorney's Office)

Boston Marathon Explosions A Department of Homeland Security police officer patrols with his dog outside the Moakley Federal Courthouse in Boston, Mass., Wednesday, May 1, 2013. Three suspects were taken into custody in the Boston Marathon bombing case including two college friends of Dzhokhar Tsarneav, according to officials. (AP Photo/Charles Krupa)

Boston Marathon Explosions A van carrying three college friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev drives away from the Moakley Federal Courthouse in Boston, Mass., Wednesday, May 1, 2013. Dias Kadyrbayev, Azamat Tazhayakov and Robel Phillipos were arrested and charged with removing a backpack containing hollowed-out fireworks from Tsarnaev's dorm room. (AP Photo/Charles Krupa)

Robel Phillipos This courtroom sketch shows signed by artist Jane Flavell Collins defendant Robel Phillipos appearing in front of Federal Magistrate Marianne Bowler at the Moakley Federal Courthouse in Boston, Mass., Wednesday, May 1, 2013. The Phillipos, and two other college friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev, were arrested and charged with removing a backpack containing hollowed-out fireworks from Tsarnaev's dorm room. (AP Photo/Jane Flavell Collins)

Richard DesLauriers Special Agent in Charge of the FBI's Boston Field Office Richard DesLauriers departs after the arraignment of three college friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev at the Moakley Federal Courthouse in Boston, Mass., Wednesday, May 1, 2013. Dias Kadyrbayev, Azamat Tazhayakov and Robel Phillipos were arrested and charged with removing a backpack containing hollowed-out fireworks from Tsarnaev's dorm room. (AP Photo/Charles Krupa)

Anzor Tsarnaev The father of the two Boston bombing suspects, Anzor Tsarnaev speaks at a news conference in Makhachkala, the southern Russian province of Dagestan, Thursday, April 25, 2013. The father of the two Boston bombing suspects said Thursday that he is leaving Russia for the United States in the next day or two, but their mother said she was still thinking it over. (AP Photo/Musa Sadulayev)

Zubeidat Tsarnaeva, Anzor Tsarnaev The mother of the two Boston bombing suspects, Zubeidat Tsarnaeva, with the suspects' father Anzor Tsarnaev, left, speaks at a news conference in Makhachkala, the southern Russian province of Dagestan, Thursday, April 25, 2013. The father of the two Boston bombing suspects said Thursday that he is leaving Russia for the United States in the next day or two, but their mother said she was still thinking it over. (AP Photo/Musa Sadulayev)

Zubeidat Tsarnaeva, Anzor Tsarnaev The father of the two Boston bombing suspects, Anzor Tsarnaev, left, with the suspects' mother Zubeidat Tsarnaeva, center, speaks at a news conference in Makhachkala, the southern Russian province of Dagestan, Thursday, April 25, 2013. The father of the two Boston bombing suspects said Thursday that he is leaving Russia for the United States in the next day or two, but their mother said she was still thinking it over. At right is Tsarnaeva sister-in-law Maryam. (AP Photo/Sergei Rasulov, NewsTeam)

Zubeidat Tsarnaeva, Anzor Tsarnaev Zubeidat Tsarnaeva, the mother of the two Boston bombing suspects, speaks at a news conference as the suspects' father, Anzor Tsarnaev listens in Makhachkala, in the southern Russian province of Dagestan, Thursday, April 25, 2013. Anzor Tsarnaev said Thursday that he is leaving Russia for the United States in the next day or two, but their mother said she was still thinking it over. (AP Photo/Musa Sadulayev)

Zubeidat Tsarnaeva Zubeidat Tsarnaeva, the mother of the two Boston bombing suspects, speaks at a news conference as her sister-in-law, Maryam, listens in Makhachkala, in the southern Russian province of Dagestan, Thursday, April 25, 2013. The suspects' father, Anzor Tsarnaev, said Thursday that he is leaving Russia for the United States in the next day or two, but their mother said she was still thinking it over. (AP Photo/Musa Sadulayev)

Boston Marathon US Muslims Men read the Koran before a prayer service at the Islamic Society of Boston mosque in Cambridge, Mass. on Friday, April 26, 2013. Leaders of the Islamic Society of Boston said bombing suspect Tamerlan Tsarnaev occasionally attended Friday prayers, but had protested the community's moderate approach. (AP Photo/Robert F. Bukaty)

Boston Marathon US Muslims A man bows during a prayer service at the Islamic Society of Boston mosque in Cambridge, Mass. on Friday, April 26, 2013. Leaders of the Islamic Society of Boston said bombing suspect Tamerlan Tsarnaev occasionally attended Friday prayers, but had protested the community's moderate approach. (AP Photo/Robert F. Bukaty)

Azamat Tazhayakov, Dias Kadyrbayev, Dzhokhar Tsarnaev This undated photo added on April 18, 2013 to the VK page of Dias Kadyrbayev shows, from left, Azamat Tazhayakov and Dias Kadyrbayev, from Kazakhstan, with Boston Marathon bombing suspect Dzhokhar Tsarnaev in Times Square in New York. Kadyrbayev and Tazhayakov, two college buddies of Tsarnaev, were jailed by immigration authorities the day after Tsarnaev's capture. They are not suspects, but are being held for violating their student visas by not regularly attending classes, Kadyrbayev's lawyer, Robert Stahl said. They are being detained at a county jail in Boston. (AP Photo/VK)

Dias Kadyrbayev, Dzhokhar Tsarnaev This undated photo found on the VK page of Dias Kadyrbayev shows Kadyrbayev, left, with Boston Marathon bombing suspect Dzhokhar Tsarnaev, at an unknown location. Kadyrbayev and Azamat Tazhayakov, two college buddies of Tsarnaev from Kazakhstan, were jailed by immigration authorities the day after Tsarnaev's capture. They are not suspects, but are being held for violating their student visas by not regularly attending classes, Kadyrbayev's lawyer, Robert Stahl said. They are being detained at a county jail in Boston. (AP Photo/VK)

Boston Marathon Congress In this Saturday, April 27, 2013 file photo, visitors pause at a makeshift memorial in Copley Square for victims of the Boston Marathon bombings, in Boston. Rep. Michael McCaul, the chairman of the House Homeland Security Committee, says he believes the Boston Marathon bombing suspects had some training in carrying out their attack. McCaul is citing the type of device used in the attack, the shrapnel-packed pressure-cooker bombs, and the weapons' sophistication as signs of training. (AP Photo/Robert F. Bukaty, File)

Ron Brassard, Robert Wheeler Ron Brassard, who was injured in the Boston Marathon bombings, applauds Robert Wheeler as he is honored as the "Hero Among Us" during a break in Game 4 of a first-round NBA basketball playoff series between the Boston Celtics and the New York Knicks in Boston, Sunday, April 28, 2013. Minutes after Wheeler completed the 26.2 mile race on April 15, he heard two loud explosions erupt nearby. He rushed to the scene and came to the aid of Brassard whose leg had been struck by shrapnel and immediately used his shirt to stop the bleeding. (AP Photo/Elise Amendola)

Marathon Fire In this image taken from a video, an undated family photo provided by Patimat Suleimanova, the aunt of USA Boston bomb suspects, shows Anzor Tsarnaev left, Zubeidat Tsarnaev holding Tamerlan Tsarnaev and Anzor's brother Mukhammad Tsarnaev. Now known as the angry and grieving mother of the Boston Marathon bombing suspects, Zubeidat Tsarnaev is drawing increased attention after federal officials say Russian authorities intercepted her phone calls, including one in which she vaguely discussed jihad with her elder son. In another, she was recorded talking to someone in southern Russia who is under FBI investigation in an unrelated case, U.S. officials said. (AP Photo/Patimat Suleimanova)

Boston Marathon Suspects Sister A car backs into a driveway next to the apartment building where Ailina Tsarnaev lives Monday, April 22, 2013, in West New York, N.J. Tsarnaev, 22, a sister of the Boston Marathon bombing suspects plans to release a statement, possibly on Tuesday, according to attorney Joseph Ginarte, who said he represents the family. (AP Photo/Mel Evans)

Joseph Ginarte Attorney Joseph Ginarte answers questions as he leaves the apartment of Ailina Tsarnaev in West New York, N.J., Monday, April 22, 2013. Ginarte said Tsarnaev, 22, a sister of the Boston Marathon bombing suspects, plans to release a statement, possibly on Tuesday. Ginarte says it's a very difficult time for the family and "you can imagine what they are going through." He declined further comment. (AP Photo/Mel Evans)

APTOPIX Boston Marathon Bombings Massachusetts Institute of Technology student Hajar Boughoula of Bizerte, Tunisia, writes a message on the ground with chalk near a makeshift memorial for fallen MIT police officer Sean Collier on the school's campus in Cambridge, Mass., Monday, April 22, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were responsible. (AP Photo/Steven Senne)

Boston Marathon Wife In this Sunday, April 21, 2013 photo, Katherine Russell Tsarnaev, center, wife of killed Boston Marathon bombing suspect Tamerlan Tsarnaev, exits a car at the home of her parents in North Kingstown, R.I. At left is her father, Warren Russell. Federal authorities have asked to speak with her, and her lawyer said he is discussing with them how to proceed. (AP Photo/Katie Zezima)

Boston Marathon Lives Saved FILE - In this Thursday, April 18, 2013 file photo provided by the Hern family, first lady Michelle Obama, right, visits with Aaron Hern, lower left, his parents Alan and Katherine, and sister Abby, all of Martinez, Calif., at Massachusetts General Hospital in Boston. The 11-year-old boy was one of more than 180 people injured in Monday's explosions at the finish line of the Boston Marathon. One week after the bombings, all of the people injured in the blasts who made it to a hospital alive now seem likely to survive. The remarkable, universal survival of those injured is a testimonial to fast care at the scene, on the way to hospitals, then in emergency and operating rooms. (AP Photo/Hern Family, File)

Barbara J. Cole People, including Barbara J. Cole, center, chant during a vigil for the victims of the Boston Marathon bombing, Saturday, April 20, 2013, in Watertown, Mass. Suspected bomber Dzhokhar Tsarnaev is hospitalized in serious condition with unspecified injuries after he was captured in an all day manhunt the day before. (AP Photo/Julio Cortez)

Brandon O'Neill Watertown Police officer Brandon O'Neill holds a flag during a vigil for the victims of the Boston Marathon bombing, Saturday, April 20, 2013, in Watertown, Mass. Suspected bomber Dzhokhar Tsarnaev is hospitalized in serious condition with unspecified injuries after he was captured in an all day manhunt the day before. (AP Photo/Julio Cortez)

Annie Packard Annie Packard, 13, sings during Trinity Episcopal Church Sunday service at Temple Israel, which allowed the Trinity congregation hold service, Sunday, April 21, 2013, in Boston. Trinity is within the blocked-off area near the finish line of the Boston Marathon, where earlier in the week two bombs exploded. Packard was in the grandstands when the first bomb exploded and ran away in the direction of the second bomb, which went off 10 seconds later. (AP Photo/Julio Cortez)

Boston Marathon Explosions Members of Trinity Episcopal Church in Boston listen to a sermon at Temple Israel, which allowed the Trinity congregation hold Sunday service, Sunday, April 21, 2013, in Boston. Trinity is within the blocked off area near the finish line of the Boston Marathon, where earlier in the week two bombs exploded. (AP Photo/Julio Cortez)

Boston Marathon Explosions An interfaith service is held near a makeshift memorial on Boylston Street, near the finish line of the Boston Marathon, Sunday, April 21, 2013, in Boston. The city is coping in the aftermath of the marathon bombing. (AP Photo/Julio Cortez)

Royals Red Sox Baseball A group of first responders to the Boston Marathon bombings hug on the dugout as the crowd applauds during a tribute in the fifth inning of the first game of a baseball doubleheader between the Boston Red Sox and the Kansas City Royals in Boston, Sunday, April 21, 2013. (AP Photo/Michael Dwyer)

Run for Boston Runners wearing items in support of the city of Boston run though New York's Central Park Sunday, April 21, 2013, in the wake of the bombings at the Boston Marathon. Thousands of New Yorkers donned "I Run for Boston" bibs during a 4-mile run Sunday in Central Park, one of a number of races held around the world in support of the victims of the marathon bombings. (AP Photo/Craig Ruttle)

Run for Boston A group of runners who gather to show support for the city of Boston stand for a moment of silence Sunday, April 21, 2013, in New York's Central Park in the wake of the bombings at the Boston Marathon. (AP Photo/Craig Ruttle)

Boston Marathon Explosions Investigators work near the location, on Saturday, April 20, 2013, in Watertown, Mass., where the previous night a suspect in the Boston Marathon bombings was arrested. Police captured Dzhokhar Tsarnaev, 19, the surviving Boston Marathon bombing suspect, in a backyard boat after a wild car chase and gun battle earlier in the day left his older brother dead. (AP Photo/Katie Zezima)

The Massachusetts State Police released this image taken from a police helicopter as police surrounded the marathon bombing suspect in Watertown, Mass., Friday evening. (Massachusetts State Police)

The Massachusetts State Police released this image taken from a police helicopter as police surrounded the marathon bombing suspect in Watertown, Mass., Friday evening. (Massachusetts State Police)

Boston Marathon Explosions In this Friday, April 19, 2013 photo obtained by The Associated Press and authenticated by a member of the Bureau of Alcohol, Tobacco, Firearms and Explosives, ATF and FBI agents check suspect Dzhokhar Tsarnaev for explosives and also give him medical attention after he was apprehended in Watertown, Mass., at the end of a tense day that began with his older brother, Tamerlan, dying in a getaway attempt. Tsarnaev lay hospitalized in serious condition under heavy guard Saturday as investigators continue piecing together the who and why of the two brothers involved in the deadly Boston Marathon bombings. (AP Photo)

The Massachusetts State Police released this image taken from a police helicopter as police surrounded the marathon bombing suspect in Watertown, Mass., Friday evening. (Massachusetts State Police)

Richard Donohue Jr., Sean Collier In this 2010 photo provided by the Massachusetts Bay Transportation Authority, Richard Donohue Jr., left, and Sean Collier pose together for a photo at their graduation from the Municipal Police Officers' Academy. On Thursday, April 18, 2013, Massachusetts Institute of Technology Police Officer Collier was fatally shot on the MIT campus, and transit police officer Donohue was shot and critically wounded. Authorities allege that Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were responsible. (AP Photo/Massachusetts Bay Transportation Authority)

Joseph Eli Libby Joseph Eli Libby, 20, of Boston, carries a flag near a makeshift memorial on Boylston Street, near the finish line of the Boston Marathon, Friday, April 19, 2013, in Boston. Boston Marathon bombing suspect Dzhokhar Tsarnaev was captured in Watertown, Mass. The 19-year-old college student wanted in the bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Julio Cortez)

APTOPIX Police Converge Mass A police officer reacts to news of the arrest of one of the Boston Marathon bombing suspects, Friday, April 19, 2013, in Boston. Boston Marathon bombing suspect Dzhokhar Tsarnaev was captured in Watertown, Mass. The 19-year-old college student wanted in the bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Julio Cortez)

Lisa Mara, Heather Buda Lisa Mara, 27, left, and her best friend Heather Buda, 26, embrace each other while paying respects at a makeshift memorial on Boylston Street near the finish line of the Boston Marathon, Friday, April 19, 2013, in Boston. Marathon bombing suspect Dzhokhar Tsarnaev was captured in Watertown, Mass. The 19-year-old college student wanted in the bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Julio Cortez)

Andre Savazoni Andre Savazoni, 38, of Brazil, who participated in his second Boston Marathon this week, takes a photo of a crowd gathered at Boston Common after the final suspect in the Boston Marathon bombing was arrested, Friday, April 19, 2013, in Boston. Marathon bombing suspect Dzhokhar Tsarnaev was captured in Watertown, Mass. The 19-year-old college student wanted in the bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Julio Cortez)

Police Converge-Mass A crowd gathers at Boston Common after the final suspect in the Boston Marathon bombing was arrested, Friday, April 19, 2013, in Boston. Marathon bombing suspect Dzhokhar Tsarnaev was captured in Watertown, Mass. The 19-year-old college student wanted in the bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Julio Cortez)

Police Converge Mass The Longfellow Bridge is deserted at 10:00 AM, Friday, April 19, 2013, during a call for "shelter-in-place" for Boston and some area communities. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Antonio Regalado)

Police Converge-Mass A crowd gathers at Boston Common after the final suspect in the Boston Marathon bombing was arrested, Friday, April 19, 2013, in Boston. Marathon bombing suspect Dzhokhar Tsarnaev was captured in Watertown, Mass. The 19-year-old college student wanted in the bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Julio Cortez)

APTOPIX Boston Marathon Explosions This still frame from video shows Boston Marathon bombing suspect Dzhokhar Tsarnaev visible through an ambulance after he was captured in Watertown, Mass., Friday, April 19, 2013. The 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Robert Ray)

Dzhokhar Tsarnaev This updated wanted poster was released by the FBI Friday evening, April 19, 2013, showing Dzhokhar Tsarnaev, the suspect the FBI originally called suspect number 2 in the bombings at the Boston Marathon. The 19-year-old Massachusetts college student wanted in the Boston Marathon bombing was captured hiding in a boat parked in a backyard Friday night. (AP Photo/FBI)

Police Converge Mass People cheer passing police after the arrest of a suspect of the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt. (AP Photo/Matt Rourke)

Police Converge Mass A police cruiser drives by as people react to news of the arrest of one of the Boston Marathon bombing suspects, Friday, April 19, 2013, in Boston. Boston Marathon bombing suspect Dzhokhar Tsarnaev was captured in Watertown, Mass. The 19-year-old college student wanted in the bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Julio Cortez)

Police Converge Mass Police officers smile to fellow officers as they leave the scene after the arrest of a suspect of the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. A 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Matt Rourke)

Barack Obama President Barack Obama arrives to speak in the Brady Press Briefing at the White House in Washington, Friday, April 19, 2013, regarding the Boston Marathon bombing. (AP Photo/Manuel Balce Ceneta)

Deval Patrick, Massachusetts Governor Deval Patrick, at podium, speaks during a news conference, after the arrest of a suspect of the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. A 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Matt Rourke)

Police Converge Mass A police officer reacts to news of the arrest of one of the Boston Marathon bombing suspects, Friday, April 19, 2013, in Boston. Boston Marathon bombing suspect Dzhokhar Tsarnaev was captured in Watertown, Mass. The 19-year-old college student wanted in the bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Julio Cortez)

Boston Marathon Suspects FILE - In this May 4, 2009 file photo, Tamerlan Tsameav, left, fights Lamar Fenner of Chicago, in the 201 weight class, during the 2009 Golden Gloves National Boxing Tournament at the Salt Palace, Monday, May 4, 2009. Tsameav was identified as a suspect in the Boston Marathon bombings. Tsarnaev, who had been known to the FBI as Suspect No. 1 and was seen in surveillance footage in a black baseball cap, was killed overnight Thursday during a getaway attempt, officials said. On Friday, April 19, 2013, thousands of officers were swarming the streets in and around Boston hunting for Tsarnaev's younger brother, Dzhokhar Tsarnaev, 19. (AP Photo/The Salt Lake Tribune, Rick Egan) DESERET NEWS OUT; LOCAL TV OUT; MAGS OUT

Boston Marathon Suspects FILE - In this May 4, 2009 file photo, Tamerlan Tsameav, left, fights Lamar Fenner of Chicago, in the 201 weight class, during the 2009 Golden Gloves National Boxing Tournament at the Salt Palace, Monday, May 4, 2009. Tsameav was identified as a suspect in the Boston Marathon bombings. Tsarnaev, who had been known to the FBI as Suspect No. 1 and was seen in surveillance footage in a black baseball cap, was killed overnight Thursday during a getaway attempt, officials said. On Friday, April 19, 2013, thousands of officers were swarming the streets in and around Boston hunting for Tsarnaev's younger brother, Dzhokhar Tsarnaev, 19. (AP Photo/The Salt Lake Tribune, Rick Egan) DESERET NEWS OUT; LOCAL TV OUT; MAGS OUT

Boston Marathon Suspects FILE - In this May 4, 2009 file photo, Tamerlan Tsameav, left, fights Lamar Fenner of Chicago, in the 201 weight class, during the 2009 Golden Gloves National Boxing Tournament at the Salt Palace, Monday, May 4, 2009. Tsameav was identified as a suspect in the Boston Marathon bombings. Tsarnaev, who had been known to the FBI as Suspect No. 1 and was seen in surveillance footage in a black baseball cap, was killed overnight Thursday during a getaway attempt, officials said. On Friday, April 19, 2013, thousands of officers were swarming the streets in and around Boston hunting for Tsarnaev's younger brother, Dzhokhar Tsarnaev, 19. (AP Photo/The Salt Lake Tribune, Rick Egan) DESERET NEWS OUT; LOCAL TV OUT; MAGS OUT

Boston Marathon Suspects FILE - In this May 4, 2009 file photo, Tamerlan Tsameav, left, fights Lamar Fenner of Chicago, in the 201 weight class, during the 2009 Golden Gloves National Boxing Tournament at the Salt Palace, Monday, May 4, 2009. Tsameav was identified as a suspect in the Boston Marathon bombings. Tsarnaev, who had been known to the FBI as Suspect No. 1 and was seen in surveillance footage in a black baseball cap, was killed overnight Thursday during a getaway attempt, officials said. On Friday, April 19, 2013, thousands of officers were swarming the streets in and around Boston hunting for Tsarnaev's younger brother, Dzhokhar Tsarnaev, 19. (AP Photo/The Salt Lake Tribune, Rick Egan) DESERET NEWS OUT; LOCAL TV OUT; MAGS OUT

Police Converge Mass Heavily armed police officers do house to house searches in the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

Police Converge Mass A heavily armed police officer walks along a street during house to house searches in the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

Police Converge Mass Heavily armed police officers do house to house searches the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

Police Converge Mass People and a pet gather outside a home as heavily armed police officers did house to house search on a street in Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

Police Converge Mass Heavily armed police officers do house to house searches the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

Police Converge Mass Heavily armed police officers do house to house searches in the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

Police Converge Mass Investigators carry boxes into a building on Norfolk Street as the search for one of the Boston Marathon bombing suspects continues in Cambridge, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Michael Dwyer)

Police Converge Mass A SWAT team drives through a neighborhood while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa)

Police Converge Mass A girl looks out the window of her family's home as a SWAT team drives through her neighborhood while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa)

Police Converge Mass Heavily armed police officers do house to house searches in the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

The FBI released this 'Wanted' poster Friday afternoon of the second suspect in marathon bombings.

<> on April 19, 2013 in Cambridge, Massachusetts. Members of a SWAT team search for 19-year-old bombing suspect Dzhokhar A. Tsarnaev on April 19, 2013 in Watertown, Mass. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning April 19, and a manhunt is underway for his brother and second suspect, 19-year-old suspect Dzhokhar A. Tsarnaev. The two men, reportedly Chechen of origin, are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. (Photo by Mario Tama/Getty Images)

Ruslan Tsarni Ruslan Tsarni, the uncle of the Boston Marathon bombing suspects, walks into his home in Montgomery Village in Md. Friday, April, 19, 2013. The brothers, who came from a Russian region near Chechnya, lived together on Norfolk Street in Cambridge, Mass. They had been in the country for about a decade, according to an uncle, Ruslan Tsarni of Montgomery Village, Md. (AP Photo/Jose Luis Magana)

Ruslan Tsarni Ruslan Tsarni, the uncle of the Boston Marathon bombing suspect, speaks with the media outside his home in Montgomery Village in Md. Friday, April, 19, 2013. Tsarni urged his nephew to turn himself in. (AP Photo/Jose Luis Magana)

Ruslan Tsarni FBI agents escort Ruslan Tsarni, uncle of the Boston Marathon bombing suspects, second from right, into his home in Montgomery Village in Md. Friday, April, 19, 2013. The brothers, who came from a Russian region near Chechnya, lived together on Norfolk Street in Cambridge, Mass. They had been in the country for about a decade, according to an uncle, Ruslan Tsarni of Montgomery Village, Md. (AP Photo/Jose Luis Magana)

Boston Marathon Suspects A Montgomery County, Md. police officer pushes the media back from in front of the house of the uncle of the Boston Marathon bombing suspects, Friday, April 19, 2013, in Montgomery Village in Md. The uncle, Ruslan Tsarni of Montgomery Village, Md., told The Associated Press that the men lived together near Boston and have been in the US for about a decade. They came from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars. (AP Photo/Jose Luis Magana)

Boston Marathon Suspects Montgomery County, Md. police officers stretch a police line around the house of the uncle of the suspects in the Boston Marathon bombing, Friday April, 19, 2013, in Montgomery Village in Md. The uncle, Ruslan Tsarni of Montgomery Village, Md., told The Associated Press that the men lived together near Boston and have been in the US for about a decade. They came from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars. (AP Photo/Jose Luis Magana)

Boston Marathon Suspects Montgomery County, Md. police officers stretch a police line around the house of the uncle of the suspects in the Boston Marathon bombing, Friday April, 19, 2013, in Montgomery Village in Md. The uncle, Ruslan Tsarni of Montgomery Village, Md., told The Associated Press that the men lived together near Boston and have been in the US for about a decade. They came from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars. (AP Photo/Jose Luis Magana)

Police Converge Mass Residents view police in tactical gear as law enforcement conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

Police Converge Mass A resident views police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke)

Police Converge Mass A resident evacuates as police go door-to-door on Norfolk Street in search of a suspect in the Boston Marathon bombings in Cambridge, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Michael Dwyer)

Police Converge Mass A resident views police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke)

Boston Marathon Explosion In this undated photo provided by Robin Young, Dzhokhar A. Tsarnaev, left, and Here & Now host Robin Young's nephew, right, pose for a photo after graduating from Cambridge Rindge and Latin High School. Tsarnaev has been identified as the surviving suspect in the marathon bombings. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, April 19, 2013. (AP Photo/Robin Young)

Boston Marathon Explosions A police officer and a Federal Bureau of Investigation agent run as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

Boston Marathon Explosions A police officer with is weapon drawn conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

Boston Marathon Explosions A message calling for citizens of Boston to "Shelter in Place" flashes on a sign on I-93 near the Zakim Bridge in Boston Friday, April 18, 2013. The Boston area was all but paralyzed as a manhunt continued for Dzhokhar Tsarnaev, one of the two suspects in the Boston Marathon bombing who authorities say killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left his brother, Tamerian Tsarnaev, dead. (AP Photo/Elise Amendola)

Police Converge Mass A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke)

Police Converge Mass A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

Police Converge Mass A police officer signals for people to get back as they conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke)

Police Converge Mass Police run with their weapons drawn as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

Police Converge Mass Heavily armed police continue to patrol the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as they continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

Police Converge Mass Heavily armed police enter a building in Watertown, Mass. Friday, April 19, 2013, as law enforcement officials continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

Boston Marathon Explosions A police officer and a Federal Bureau of Investigation agent run as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

Boston Marathon Explosions A message calling for citizens of Boston to "Shelter in Place" flashes on a sign on I-93 near the Zakim Bridge in Boston Friday, April 18, 2013. The Boston area was all but paralyzed as a manhunt continued for Dzhokhar Tsarnaev, one of the two suspects in the Boston Marathon bombing who authorities say killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left his brother, Tamerian Tsarnaev, dead. (AP Photo/Elise Amendola)

Dzhokhar Tsarnaev This undated photo provided by the vkontakte website shows Dzhokhar Tsarnaev. Dzhokhar Tsarnaev has been on the run, described as "armed and dangerous" and suspected of the Boston Marathon bombing. His brother, Tamerlan, was killed during a violent police chase. The two ethnic Chechen brothers came from Dagestan, a Russian republic bordering the province of Chechnya. (AP Photo/vk.com)

Boston Marathon Explosions, Sean Collier This undated photo provided by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, 26, of Somerville, Mass., who was shot to death Thursday, April 18, 2013 on the school campus in Cambridge, Mass. Authorities said surveillance tape recorded late Thursday showed one of the Boston Marathon bombing suspects during a robbery of a nearby convenience store before Collier was shot to death while responding to a report of a disturbance. (AP Photo/Middlesex District Attorney's Office)

Police Converge Mass Heavily armed FBI agents are on the scene on Norfolk Street in Cambridge, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Michael Dwyer)

Police Converge Mass A barefooted woman runs for cover as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa)

Boston Marathion Explosions This photo released Friday, April 19, 2013 by the Federal Bureau of Investigation shows a suspect that officials identified as Dzhokhar Tsarnaev, being sought by police in the Boston Marathon bombings Monday. (AP Photo/Federal Bureau of Investigation)

Police Converge Mass Police cover as they surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa)

Police Converge Mass Police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa)

Police Converge Mass A man walks out of his home in a bath robe as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday.(AP Photo/Charles Krupa)

Police Converge Mass A sign along I-93 in Medford, Mass. announces no MBTA service Friday, April 18, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Elise Amendola)

Police Converge Mass Law enforcement officials stand guard while searching for an individual believed to be involved in the Boston Marathon explosions in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Julio Cortez)

Police Converge Mass Commuters are turned away at Malden Center station in Malden, Mass. Friday, April 18, 2013 as area MBTA commuter trains are suspended. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Elise Amendola)

Police Converge Mass Residents are seen near a window, top, as an official wearing tactical gear stands guard while searching for an individual believed to be involved in the Boston Marathon explosions in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)

Police Converge Mass An MBTA transit official closes a door at Malden Center station in Malden, Mass. Friday, April 18, 2013 as area MBTA commuter trains are suspended. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Elise Amendola)

Police Converge Mass A woman heads away from a building in Cambridge, Mass., after being evacuated by police from her home next door, Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Michael Dwyer)

Police Converge Mass An unidentified resident of Norfolk Street in Cambridge, Mass., talks with police, Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Michael Dwyer)

Police Converge Mass An FBI agent interviews two unidentified residents of Norfolk Street in Cambridge, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Michael Dwyer)

Police Converge Mass This combo of photos released by the Federal Bureau of Investigation early Friday April 19, 2013, shows what the FBI is calling suspects number 1, left, and suspect number 2, right, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

Boston Marathon Explosions This image provided by the Boston Regional Intelligence Center shows Dzhokhar A. Tsarnaev, one of the suspects in the Boston Marathon bombings. Authorities say Tsarnaev is still at large after he and another suspect — both identified to The Associated Press as coming from the Russian region near Chechnya — killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence into the early hours of Friday, April 19, 2013. The second suspect, who has not yet been identified, was killed in a shootout with police. (AP Photo/Boston Regional Intelligence Center)

Boston Marathon Explosions This image provided by the Boston Regional Intelligence Center shows Dzhokhar A. Tsarnaev, identified by the FBI as suspect number 2, in the Boston Marathon bombings. Authorities say Tsarnaev is still at large after he and another suspect — both identified to The Associated Press as coming from the Russian region near Chechnya — killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence into the early hours of Friday, April 19, 2013. The second suspect, who has not yet been identified, was killed in a shootout with police. (AP Photo/Boston Regional Intelligence Center)

Boston Marathon Explosions This image provided by the Boston Regional Intelligence Center shows Dzhokhar A. Tsarnaev, identified by the FBI as suspect number 2, in the Boston Marathon bombings. Authorities say Tsarnaev is still at large after he and another suspect — both identified to The Associated Press as coming from the Russian region near Chechnya — killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence into the early hours of Friday, April 19, 2013. The second suspect, who has not yet been identified, was killed in a shootout with police. (AP Photo/Boston Regional Intelligence Center)

Boston Marathon Explosions Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. All residents of Boston were ordered to stay in their homes Friday morning as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Charles Krupa)

Police Converge Mass Police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. All residents of Boston were ordered to stay in their homes Friday morning as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Matt Rourke)

Police Converge Mass Information is seen on a computer inside a Boston Police vehicle as officials searched an apartment building in Watertown, Mass., Friday, April 19, 2013. Dozens of officers and National Guard members are in Watertown, where gunfire and explosions were heard early Friday morning. All residents of Boston were ordered to stay in their homes, as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Julio Cortez)

Boston Marathon Explosions A police official inspects an object that was picked up by a remote control device, left, following a shootout with suspects in the Boston Marathon bombings early Friday, April 19, 2013, in Watertown, Mass. (AP Photo/Craig Ruttle)

APTOPIX Police Converge Mass Police officers aim their weapons Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke)

Police Converge Mass Police officers aim their weapons Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke)

Police Converge Mass Police work a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke)

Boston Marathon Explosions Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. All residents of Boston were ordered to stay in their homes Friday morning as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Charles Krupa)

APTOPIX Police Converge Mass Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke)

Police Converge Mass Information is seen on a computer inside a Boston Police vehicle as officials searched an apartment building in Watertown, Mass., Friday, April 19, 2013. Dozens of officers and National Guard members are in Watertown, where gunfire and explosions were heard early Friday morning. All residents of Boston were ordered to stay in their homes, as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Julio Cortez)

Police Converge Mass Police patrol through a neighborhood in Watertown, Mass., while searching for a suspect in the Boston Marathon bombings, Friday, April 19, 2013. All residents of Boston were ordered to stay in their homes Friday morning as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Charles Krupa)

Police Converge Mass This surveillance photo released via Twitter Friday, April 19, 2013 by the Boston Police Department shows a suspect entering a convenience store that police are pursuing in Watertown, Mass. Police say he is one of two suspects in the fatal shooting of an MIT police officer and tied to the Boston Marathon bombing. (AP Photo/Boston Police Department)

(AP Photo/Boston Police Department)

APTOPIX Police Converge Mass This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling the suspects together, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

Police Converge Mass A police officers rides in the back of a van with his weapons out Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke)

Police Converge Mass This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling suspect number 2 behind a lady, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

Police Converge Mass Police officers with their weapons out search for a suspect Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke)

Police Converge Mass A vehicle carrying officers in tactical gear arrives at the Watertown neighborhood of Boston, Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez)

Police Converge Mass Officials address the media during a news conference in Watertown, Mass., Friday, April 19, 2013. Officials are urging residents of Watertown and surrounding towns to stay indoors. One of two suspects in the Boston Marathon bombing is dead after the killing of a university officer and a shootout with police, and a massive manhunt is underway for the other, authorities said early Friday. (AP Photo/Julio Cortez)

A close-up photo of a suspect released but the Federal Bureau of Investigation. (FBI)

A close-up photo of a suspect released but the Federal Bureau of Investigation. (FBI)

The FBI released this profile image of a man identified as suspect No. 2 in Monday's marathon bombing. Police are asking for the public's help to identify the two men. (FBI)

(FBI)

The FBI released this image highlighting the face of a man dubbed suspect No. 2. Police are trying to identify the man and believe he was involved in Monday's marathon bombing. (FBI)

The FBI released these images of a man named as suspect No. 2 in Monday's Boston Marathon bombing. (FBI)

The FBI released this screen grab of the two men identified as suspects in Monday's marathon bombing. The men were captured walking together through the crowd by a surveillance camera. (FBI)

The FBI released this surveillance video showing two men identified as suspects in the Boston Marathon bombing. Investigators are asking for the public's help in identifying the men. Call 1-800-call-fbi or visit bostonmarathontips.fbi.gov.(FBI)

The FBI released this image of a man in a dark hat identified as a suspect in Monday's marathon bombing. He is seen here in a screen grab from a video walking among the crowd at the marathon. (WTOP/CBS NEWS)

The FBI released this image of the man identified as suspect No. 2 walking through the crowds at the Boston Marathon Monday. (WTOP/CBS News)

Barack Obama President Barack Obama attends an interfaith healing service at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013, for victims of Monday's Boston Marathon explosions. (AP Photo/Charles Krupa)

Barack Obama, Michelle Obama President Obama and first lady Michelle Obama arrive for an interfaith healing service at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013, for victims of Monday's Boston Marathon explosions. (AP Photo/Charles Krupa)

Boston Marathon Explosions Investigators inspect the roof of a building across the street from the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the roof of a building adjacent to the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the roof of a building across the street from the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the roof of a building adjacent to the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the roof of a building adjacent to the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions at the marathon. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the roof of a building adjacent to the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions at the marathon. (AP Photo/Julio Cortez)

Boston Marathon Explosions People gather ahead of an interfaith service with President Barack Obama at Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

Boston Marathon Explosions Lizzie Lee of Lynnwood, Wash., pauses near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. Lee said she almost completed the marathon before the blasts. (AP Photo/Matt Rourke)

Boston Marathon Explosions Marathon runner Nathan Finney of Boston and his daughter Mckenna, 5, gather with others ahead of an interfaith service with President Barack Obama at Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

Barack Obama, Edward Markey, Edward davis President Barack Obama hugs Rep. Edward Markey, D-Mass., after arriving at Boston's Logan International Airport, Thursday, April 18, 2013. The Obama's are attending the "Healing Our City: An Interfaith Service," dedicated to those who were gravely wounded or killed in Monday's bombing near the finish line of the Boston Marathon. Boston Police Commissioner Edward Davis is at left. (AP Photo/Susan Walsh)

Boston Marathon Explosions Investigators inspect the area between the two blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the area between the two blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common. (AP Photo/Julio Cortez)

Boston Marathon Explosions A line of investigators is form as they enter a building adjacent to one of the blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common. (AP Photo/Julio Cortez)

Britain London Marathon Workers put up fencing in the Mall near Buckingham Palace as preparations begin for the London Marathon, Thursday, April 18, 2013. The London Marathon will go ahead on Sunday despite security fears in the wake of the bomb blasts in the Boston race that killed at least three people and injured many more.(AP Photo/Alastair Grant)

Barack Obama, Michelle Obama President Barack Obama, accompanied by first lady Michelle Obama, waves to media as they leave the White House in Washington, Thursday, April 18, 2013, to board the Marine One helicopter, en route to Andrews Air Force Base and onto Boston where they will attend a service dedicated to those who were gravely wounded or killed in the bombing near the finish line of the Boston Marathon. (AP Photo/Carolyn Kaster)

Boston Marathon Explosions A message is written on a volunteer's jacket near running shoes at a makeshift memorial on Boylston Street near the blast site of the Boston Marathon explosions, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

Boston Marathon Explosions Officials congregate near the blast site of the Boston Marathon explosions, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

Boston Marathon Explosions A woman cries at a makeshift memorial on Boylston Street in Boston, near the blast site of the Boston Marathon explosions, Thursday, April 18, 2013. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

Boston Marathon Explosions A foam finger stands at a makeshift memorial on Boylston Street in Boston, near the blast site of the Boston Marathon explosions, Thursday, April 18, 2013. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the area between the two blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common. (AP Photo/Julio Cortez)

Barack Obama, Michelle Obama President Barack Obama and first lady Michelle Obama walk down the steps of Air Force One upon their arrival at Boston's Logan International Airport, Thursday, April 18, 2013. The Obama's are attending the "Healing Our City: An Interfaith Service," dedicated to those who were gravely wounded or killed in Monday's bombing near the finish line of the Boston Marathon.(AP Photo/Susan Walsh)

Boston Marathon Explosions Marathon runner Nathan Finney of Boston and his daughter Mckenna, 5, gather with others ahead of an interfaith service with President Barack Obama at Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

Boston Marathon Explosions People gather ahead of an interfaith service with President Barack Obama at Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

Boston Marathon Explosions An investigator inspects the roof of a building adjacent to the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions at the marathon. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the roof of a building adjacent to the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues. (AP Photo/Julio Cortez)

Boston Marathon Explosions Investigators inspect the roof of a building across the street from the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues. (AP Photo/Julio Cortez)

Boston Marathon Explosions This Monday April 15, 2013 photo provided by Ben Thorndike shows the scene following an explosion at the 2013 Boston Marathon in Boston. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/Ben Thorndike)

Boston Marathon Explosions This Monday April 15, 2013 photo provided by Ben Thorndike shows the scene following an explosion at the 2013 Boston Marathon in Boston. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/Ben Thorndike)

Boston Marathon Explosions This Monday April 15, 2013 photo provided by Ben Thorndike shows the scene following an explosion at the 2013 Boston Marathon in Boston. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/Ben Thorndike)

Boston Marathon Explosions Two theology students embrace following a vigil for Boston University student Lingzi Lu, who was killed in the Boston Marathon explosions, outside the school's Marsh Chapel, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon, which claimed three lives. (AP Photo/Julio Cortez)

Boston Marathon Explosions A photograph of Boston University student Lingzi Lu, who was killed in the Boston Marathon explosions, sits on a table as a student writes a message on a board outside the school's Marsh Chapel before a vigil, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon, which claimed three lives. (AP Photo/Julio Cortez)

Boston Marathon Explosions A woman reflects in front of a makeshift memorial honoring Boston University student Lingzi Lu, who was killed in the Boston Marathon explosions, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon, which claimed three lives. (AP Photo/Julio Cortez)

Boston Marathon Explosions In this Thursday, April 16, 2013 file photo, a bracket holding a security camera on a building, bottom, is visible as investigators across Boylston Street examine the scene of the second bombing near the finish line of the Boston Marathon. Boston City Council President Stephen Murphy, who said Wednesday, April 17, 2013, he was briefed by Boston police, said investigators saw the image on surveillance footage they got from a department store near the finish line, and matched the findings with witness descriptions of someone leaving the scene. (AP Photo/Elise Amendola, File)

Boston Marathon Victims A worshiper bows his head during a memorial service for Boston Marathon bombing victim Krystle Campbell at Grace Episcopal Church in Medford, Mass., Wednesday, April 17, 2013. (AP Photo/Michael Dwyer)

Boston Marathon Explosions A mourner reacts during a candlelight vigil in the aftermath of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, at City Hall in Cambridge, Mass. (AP Photo/Matt Rourke)

Boston Marathon Explosions Mourners attend a candlelight vigil in the aftermath of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, at City Hall in Cambridge, Mass. (AP Photo/Matt Rourke)

Boston Marathon Victims John Reilly, right, watches as his son John, Jr., lights a candle during a memorial service for Boston Marathon bombing victim Krystle Campbell at Grace Episcopal Church in Medford, Mass., Wednesday, April 17, 2013. Reilly, Sr., is brother to Patty Campbell, Krystle's mother. (AP Photo/Michael Dwyer)

Marathon Explosions The Wilmington Roadrunners, a group that meets weekly to run in downtown Wilmington, N.C., wear special pennants and hold hands in prayer on Tuesday, April 16, 2013 to show their respect for the victims of the Monday bombings at the Boston Marathon. Prior to their run they held hands in a prayer. (AP Photo/The Star-News, Laura Greene)

Tigers Mariners Baseball Marathon Explosuons Detroit Tigers' fan Tab Waterman, of Portland, Ore., holds a sign in honor of the victims of the Monday bombings at the Boston Marathon as he stands outside the Seattle Mariners' ballpark before a baseball game against the Tigers Tuesday, April 16, 2013, in Seattle. Waterman is dressed as Tigers manager Jim Leyland. (AP Photo/Elaine Thompson)

APTOPIX Boston Marathon Explosions A woman jogs near a statue of George Washington at Boston Common, Tuesday, April 16, 2013, one day after bombs exploded at the finish line of the Boston Marathon. A vigil is expected at Boston Common later in the day to honor the victims of the two bombs that blew up within about 10 seconds and about 100 yards apart Monday near the finish line of the race. (AP Photo/Julio Cortez)

Boston Marathon Explosions A sign is posted on the door of a Victoria's Secret store, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the Boston Marathon. (AP Photo/Julio Cortez)

BOSTON-BOMBAS-ESTUDIANTE U.S. flags hang from a barricade as Massachusetts National Guard members keep watch of Boylston Street near the site where a day earlier explosions near the Boston Marathon finish line killed three and injured more than 170 in Boston, Tuesday, April 16, 2013. The bombs that blew up seconds apart at the finish line of one of the world's most storied races left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Julio Cortez)

Boston Marathon Explosions A sign hangs from a barricade on Boylston Street near the finish line of the Boston Marathon, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

Boston Marathon Rivalry Empathy Two fans embrace while singing "Sweet Caroline" as a tribute to the victims of the Boston Marathon explosions after the third inning of a baseball game between the New York Yankees and the Arizona Diamondbacks at Yankee Stadium in New York, Tuesday, April 16, 2013. The song by Neil Diamond has been a longtime fixture as a fan sing-along during the bottom of the eighth inning of Boston Red Sox games. In big ways and small, New York is putting aside its heated and historical rivalry with Boston in a show of support after the Boston Marathon explosions. (AP Photo/Kathy Willens)

China Boston Marathon Chinese Victim A Chinese man walks past a huge screen which reports Boston Marathon bombings that killed three and wounded more than 170 people, in Beijing, China Wednesday, April 17, 2013. A state-run Chinese newspaper says the third person killed in the Boston Marathon bombings is a Chinese graduate student at Boston University originally from China's northeastern city of Shenyang. (AP Photo/Andy Wong)

China Boston Marathon Chinese Victim Chinese newspapers with the headlines of Boston Marathon bombings that killed three and wounded more than 170 people, are sold at a newsstand in Beijing, China Wednesday, April 17, 2013. A state-run Chinese newspaper says the third person killed in the Boston Marathon bombings is a Chinese graduate student at Boston University originally from China's northeastern city of Shenyang. (AP Photo/Andy Wong)

Boston Marathon Explosions Mourners attend candlelight vigil for Martin Richard at Garvey Park, near Richard's home in the Dorchester section of Boston, on Tuesday, April 16, 2013. Martin is the 8-year-old boy killed in the Boston Marathon bombing. (AP Photo/The New York Times, Josh Haner)

Lizzie Lee Lizzie Lee, 56, of Lynwood, Wash., who was participating in her first Boston Marathon and 11th overall, holds a candle and a flower at Boston Common during a vigil for the victims of the Boston Marathon explosions, Tuesday, April 16, 2013. (AP Photo/Julio Cortez)

Boston Marathon Explosions Bridget Wood, 18, of Boston, holds candles during a vigil the victims of the Boston Marathon explosions at Boston Common, Tuesday, April 16, 2013. (AP Photo/Julio Cortez)

Boston Bombings The Los Angeles Clippers pause for a moment of silence for the victims of the bombings at the Boston Marathon before their NBA basketball game against the Portland Trail Blazers in Los Angeles Tuesday, April 16, 2013. (AP Photo/Reed Saxon)

Boston Bombings Security A Los Angeles Police Bomb Squad patrol car is parked outside Staples Center before an NBA basketball game between the Portland Trail Blazers and the Los Angeles Clippers in Los Angeles Tuesday, April 16, 2013. Security measures have been increased in Los Angeles and elsewhere in light of Monday's bombings at the Boston Marathon. (AP Photo/Reed Saxon)

Lizzie Lee Lizzie Lee, 56, of Lynwood, Wash., who was participating in her first Boston Marathon and 11th overall, holds a candle and a flower at Boston Common during a vigil for the victims of the Boston Marathon explosions, Tuesday, April 16, 2013, one day after bombs exploded at the finish line of the Boston Marathon. (AP Photo/Julio Cortez)

Boston Marathon Bomb Photos This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press, shows the remains of a black backpack that the FBI says contained one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs that exploded in the Boston Marathon was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)

Boston Marathon Bomb Photos This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press, shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)

Boston Marathon Explosions The U.S. and Washington state flags fly at half-staff, Tuesday, April 16, 2013, next to the Space Needle in Seattle. Flags across the state were at half-staff in memory of the victims of the explosions Monday at the Boston Marathon. (AP Photo/Ted S. Warren)

Kirsten Feil, Tim Phillips Kirsten Feil, of New Orleans, arrives at Louis Armstrong International Airport with her boyfriend Tim Phillips, after returning from competing in the Boston Marathon, in Kenner, La., Tuesday, April 16, 2013. She recalled a scene of bloodshed and terror after bombs went off there Monday. Feil said she and her boyfriend already are talking about running next year and said she doesn't want a terrorist act to change her behavior. It was the 14th time Feil had run the Boston Marathon, and it was an event she called "a Feil family tradition" that family members have come to love. (AP Photo/Gerald Herbert)

Ben Revere Philadelphia Phillies center fielder Ben Revere runs off the field with tape on his glove that says 'Pray for Boston,' for the victims of the Monday bombings at the Boston Marathon, in the fifth inning of a baseball game against the Cincinnati Reds, Tuesday, April 16, 2013, in Cincinnati. (AP Photo/Al Behrman)

Three heavily armed U.S. Park Police officers patrol Constitution Avenue between the Washington Monument and the White House Tuesday. The bombings in Boston triggered the visible show of force and security in Washington. The officers could be seen checking parked vehicles and utility boxes. (WTOP/Dick Uliano)

Three heavily armed U.S. Park Police officers patrol Constitution Avenue between the Washington Monument and the White House Tuesday just one day after the bombings in Boston. The officers checked parked vehicles and utility boxes. (WTOP/Dick Uliano)

Boston Marathon Explosions Peace is written on the sidewalk in front of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

Boston Marathon Explosions Tammy Lynch, right, comforts her daughter Kaytlyn, 8, after leaving flowers and some balloons at the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Kaytlyn was paying her respects to her friend, 8-year old Martin Richard who was killed in Monday's bombings at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

Boston Marathon Explosions Runner Megan Cloke pauses after placing flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston,Tuesday, April 16, 2013. Martin Richard,8, was killed in Mondays' bombings at the finish line of the Boston Marathon. The boy’s mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer)

Boston Marathon Explosions Two women leave after placing flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in the Mondays bombings at the finish line of the Boston Marathon. The boy’s mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer)

Boston Marathon Explosions Two women place flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in the Mondays bombings at the finish line of the Boston Marathon. The boy’s mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer)

Boston Marathon Explosions Jacqueline Myers and her daughter Amira, 10, depart after leaving flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston,Tuesday, April 16, 2013. Martin Richard, 8, was killed in Mondays bombing at the finish line of the Boston Marathon.(AP Photo/Michael Dwyer)

Boston Marathon Explosions Neighbors hug outside the home of the Richard family in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Mondays bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

Boston Marathon Explosions Neighbors come to pay their respects at the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombings at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

APTOPIX Boston Marathon Explosions Neighbors hug outside the home of the Richard family in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

Boston Marathon Explosions A Boston Marathon runner leaves the course crying near Copley Square following an explosion at the finish line in Boston on Monday, April 15, 2013. (AP Photo/Winslow Townson)

Police and federal officials exit an apartment complex at 364 Ocean Avenue with a possible connection to the earlier explosions during the Boston Marathon on April 15, 2013 in Revere, Massachusetts. Three people are confirmed dead and at least 141 injured after two explosions went off near the finish line to the marathon. (Photo by Darren McCollester/Getty Images)

Police and federal officials exit an apartment complex at 364 Ocean Avenue with a possible connection to the earlier explosions during the Boston Marathon on April 15, 2013 in Revere, Massachusetts. Three people are confirmed dead and at least 141 injured after two explosions went off near the finish line to the marathon. (Photo by Darren McCollester/Getty Images)

Boston Marathon Explosions Two police officers have rifles and watch from the roof of the Lenox Hotel overlooking the finish area of the 2013 Boston Marathon in Boston Monday, April 15, 2013. Two bombs exploded earlier in the packed streets near the finish line of the Boston Marathon killing two people and injuring more than 80 others. (AP Photo/Elise Amendola)

Boston Marathon Explosions S.W.A.T. team members stand guard on the campus of Massachusetts General Hospital following an explosion at the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Michael Dwyer)

Boston Marathon-Explosions A SWAT team enters a hotel close to the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Winslow Townson)

Shane Magness Shane Magness, a student at Oklahoma Christian University, bows his head in prayer for the victims of the Boston Marathon bombing, at the Oklahoma City National Memorial in Oklahoma City, Monday, April 15, 2013. On Friday, Oklahoma City will observe the 18th anniversary of the April 19, 1995, bombing of the Alfred P. Murrah Federal building that killed 168 people and injured hundreds more. (AP Photo/Sue Ogrocki)

Boston Marathon Explosions In this image from video provided by Ryan Hoyme, the second explosion can be seen in the distance as smoke from the first explosion surrounds spectators exiting the stands during the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Ryan Hoyme)

Boston Marathon Explosions Investigators shine flashlights at one of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon in the wake of two blasts in Boston Monday, April 15, 2013. (AP Photo/Elise Amendola)

MIT's Green Building is lit up like the American Flag. (Via @BostonTweet on Twitter.)

Ed Davis, Deval Patrick Boston Police Commissioner Ed Davis speaks as Massachusetts Gov. Deval Patrick listens, second from left, at a news conference in Boston Monday, April 15, 2013 regarding two bombs which exploded in the street near the finish line of the Boston Marathon on Monday, killing three people and injuring more than 130. (AP Photo/Elise Amendola)

Troy Riggs Public Safety Director Troy Riggs talks about security for the upcoming Mini Marathon and Indianapolis 500 as he makes a statement to the media about the bombings at the Boston Marathon in Indianapolis, Monday, April 15, 2013. The Mini Marathon is the nation’s largest half-marathon, with 35,000 participants and is run on May 4 this year. (AP Photo/Michael Conroy)

Boston Marathon Explosions The flag on the East Front of the U.S. Capitol is lowered to half-staff on Capitol Hill, Monday, April 15, 2013, in Washington, after the explosions at the Boston Marathon. (AP Photo/Alex Brandon)

APTOPIX Boston Marathon-Explosions Injured people and debris lie on the sidewalk near the Boston Marathon finish line following an explosion in Boston, Monday, April 15, 2013. MANDATORY CREDIT(AP Photo/MetroWest Daily News, Ken McGagh)

Knicks Bobcats Basketball Marathon Explosions Reax New York Knicks players and children bow their heads in a moment of silence for the victims of the explosions at the Boston Marathon before an NBA basketball game against the Charlotte Bobcats in Charlotte, N.C., Monday, April 15, 2013. (AP Photo/Chuck Burton)

Tobias Harris, Andrew Nicholson, Al Harrington, Nikola Vucevic, Kyle O'Quinn and Maurice Harkless From right, Orlando Magic's Tobias Harris, Andrew Nicholson, Al Harrington, Nikola Vucevic, Kyle O'Quinn and Maurice Harkless observe a moment of silence for the victims of the Boston Marathon explosions before an NBA basketball game against the Chicago Bulls, Monday, April 15, 2013, in Orlando, Fla. (AP Photo/John Raoux)

Marathon Expolsions Security Los Angeles Amtrak Police officers arrest a man outside Union Station in Los Angeles Monday, April 15, 2013. The city increased security following bomb explosions in Boston that killed two people and injured more than 80 near the crowded finish line of the Boston Marathon. (AP Photo/Damian Dovarganes)

APTOPIX Boston Marathon Explosions People react as an explosion goes off near the finish line of the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions went off at the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. MANDATORY CREDIT(AP Photo/The Boston Globe, David L Ryan)

APTOPIX Boston Marathon Explosions People react to a second explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Boston Globe, John Tlumacki)

APTOPIX Boston Marathon Explosions Medical workers aid an injured woman at the finish line of the 2013 Boston Marathon following two explosions there, Monday, April 15, 2013 in Boston. Two bombs exploded near the finish of the Boston Marathon on Monday, killing at least two people, injuring at least 23 others and sending authorities rushing to aid wounded spectators. (AP Photo/Charles Krupa)

Deval Patrick, Ed Davis, Richard DesLauriers Massachusetts Gov. Deval Patrick speaks as Boston Police Commissioner Ed Davis, middle, and FBI Special Agent in Charge Richard DesLauriers, far right, listen at a news conference in Boston Monday, April 15, 2013 regarding two bombs which exploded in the street near the finish line of the Boston Marathon on Monday, killing three people and injuring more than 130. (AP Photo/Elise Amendola)

Boston Marathon Explosions A runner retrieves his belongings from a Boston Athletics Association worker at a sorting area near the site of an explosion at the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Michael Dwyer)

Boston Marathon Explosions An injured woman is tended to at the finish line of the Boston Marathon, in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Boston Globe, John Tlumacki)

Marathon Explosions Seattle Lori McConnell shows off a sign combining a Boston Red Sox logo with a yellow ribbon to other runners Monday, April 15, 2013, in Seattle. McConnell's running supply store hosted a group run early Monday evening to bring local athletes together to honor fellow runners affected by explosions earlier in the day at the finish line of the Boston Marathon. McConnell has run the race twice. (AP Photo/Elaine Thompson)

Teddy, Kenneth Wolf Amtrak Explosive Detection K-9 officer Kenneth Wolf and his dog Teddy patrol the station tunnels at Union Station in Los Angeles, Monday, April 15, 2013. The city increased security following bomb explosions in Boston that killed two people and injured more than 80 near the crowded finish line of the Boston Marathon. (AP Photo/Damian Dovarganes)

Two bombs exploded near the finish of the Boston Marathon on Monday. (AP)

About two hours after the winners crossed the line, there was a loud explosion on the north side of Boylston Street. (AP)

A third explosion was heard about an hour after the first two after authorities warned spectators to expect a loud noise from a water cannon. (AP)

Competitors and race volunteers were crying as they fled the chaos. (AP)

Bloody spectators were being carried to the medical tent that had been set up to care for fatigued runners. (AP)

Smoke rose from the blasts, fluttering through the national flags lining the route of the world's oldest and most prestigious marathon. (AP)

The Boston Marathon said that bombs caused the two explosions and that organizers were working with authorities to determine what happened. (AP)

Authorities went onto the course to carry away the injured while stragglers in the 26.2-mile race were rerouted away from the smoking site. (AP)

Runners who had not finished the race were diverted straight down Commonwealth Avenue and into a family meeting area, according to an emergency plan that had been in place. (AP)

"There are a lot of people down," said one man, whose bib No. 17528 identified him as Frank Deruyter of North Carolina. (AP)

"There are people who are really, really bloody," said one runner. (AP)

iframe code:

(AP)

A victim of the first explosion is helped on the sidewalk of Boylston Street, after two explosions went off near the finish line of the 117th Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)

Boston police race to the scene of several explosions which rocked the finish of the Boston Marathon on April 15, 2013 in Boston, Massachusetts. (Photo credit should read JOHN MOTTERN/AFP/Getty Images)

President Barack Obama talks on the phone with FBI Director Robert Mueller to receive an update on the Boston Marathon bombings. (Courtesy of White House)

Two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. (Photo by David L. Ryan/The Boston Globe via Getty Images)

Police clear the bleachers after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. (Photo by David L. Ryan/The Boston Globe via Getty Images)

Emergency personnel aid the injured on the sidewalk at the scene of the first explosion near the finish line of the Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)

Emergency personnel respond to the scene after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. (Photo by David L. Ryan/The Boston Globe via Getty Images)

U.S. Secret Service and U.S. Park Police officers stand guard on Pennsylvania Avenue in front of the White House April 15, 2013 in Washington, DC. Security around the White House was tightened after two people are confirmed dead and at least 28 injured after at least two explosions went off near the finish line of the Boston Marathon. (Photo by Alex Wong/Getty Images)

Boston Police look at blown out windows at the scene of the first explosion on Boylston Street near the finish line of the Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)

A man comforts an injured woman on the sidewalk at the scene of the first explosion on Boylston Street near the finish line of the Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)

Bystanders help an injured woman at the scene of the first explosion on Boylston Street near the finish line of the 117th Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)

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