Remembering Sept. 11 — 16 years later

WASHINGTON — Sixteen years have passed since the 9/11 attacks. See how the nation observes the day.

Flowers lay over the names of the victims of the 9/11 terrorist attacks before a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims' relatives marked the anniversary of the attacks at ground zero on Monday with a solemn and personal ceremony. (AP Photo/Seth Wenig) — Flowers lay over the names of the victims of the 9/11 terrorist attacks before a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims’ relatives marked the anniversary of the attacks at ground zero on Monday with a solemn and personal ceremony. (AP Photo/Seth Wenig)

West Virginia National Guard Staff Sgt. Sean Ruth, center, mourns the loss of his father, Army Chief Warrant Officer 4 William Ruth, who died in the September 11 attack on the Pentagon, while at the September 11th Pentagon Memorial on the 16th anniversary at the Pentagon, Monday, Sept. 11, 2017. (AP Photo/Jacquelyn Martin)

James Taormina, whose brother Dennis Taormina was killed during the Sept. 11 attacks stands by the side of the north waterfall pool before the a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims' relatives marked the anniversary of the attacks with a solemn and personal ceremony. (AP Photo/Seth Wenig) — James Taormina, whose brother Dennis Taormina was killed during the Sept. 11 attacks stands by the side of the north waterfall pool before the a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims’ relatives marked the anniversary of the attacks with a solemn and personal ceremony. (AP Photo/Seth Wenig)

U.S. and NATO soldiers stand guard during a ceremony to commemorate the Sept. 11, 2001 terrorist attack on the World Trade Center in New York, in Resolute Support headquarters, in Kabul, Afghanistan, Monday, Sept. 11, 2017. (AP Photos/Rahmat Gul)

A woman wipes away tears as she holds up a picture during a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims’ relatives marked the anniversary of the attacks at ground zero with a solemn and personal ceremony. (AP Photo/Seth Wenig)

AP Photo/Seth Wenig

A man places flowers at the edge of the north waterfall pool during a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims' relatives marked the anniversary of the attacks at ground with a solemn and personal ceremony. (AP Photo/Seth Wenig) — A man places flowers at the edge of the north waterfall pool during a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims’ relatives marked the anniversary of the attacks at ground with a solemn and personal ceremony. (AP Photo/Seth Wenig)

A civilian contractor cries during a ceremony to commemorate the Sept. 11, 2001 terrorist attack on the World Trade Center in New York, in Resolute Support headquarters, in Kabul, Afghanistan, Monday, Sept. 11, 2017. (AP Photos/Rahmat Gul)

An American flag stands over the names of the victims of the 9/11 terrorist attacks before a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims' relatives marked the anniversary of the attacks at ground zero on Monday with a solemn and personal ceremony. (AP Photo/Seth Wenig) — An American flag stands over the names of the victims of the 9/11 terrorist attacks before a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims’ relatives marked the anniversary of the attacks at ground zero on Monday with a solemn and personal ceremony. (AP Photo/Seth Wenig)

Traders on the floor of the New York Stock Exchange pause for a moment of silence on the 16th anniversary of the attacks on the World Trade Center, Monday, Sept. 11, 2017. (AP Photo/Richard Drew)

AP Photo/Richard Drew

The podium awaits the arrival of President Donald Trump as a U.S. flag is unfurled at the Pentagon on the 16th anniversary of the September 11th attacks Monday, Sept. 11, 2017. (AP Photo/Jacquelyn Martin)

AP Photo/Jacquelyn Martin

A U.S. flag is unfurled at the Pentagon on the 16th anniversary of the September 11th attacks Monday, Sept. 11, 2017. (AP Photo/Jacquelyn Martin)

AP Photo/Jacquelyn Martin

President Donald Trump stands for the national anthem during a ceremony to mark the anniversary of the Sept. 11 terrorist attacks, Monday, Sept. 11, 2017, at the Pentagon. (AP Photo/Evan Vucci)

People hold up signs with the names and pictures of victims of the 9/11 terrorist attacks during a ceremony at ground zero in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims’ relatives marked the anniversary of the attacks at ground zero with a solemn and personal ceremony. (AP Photo/Seth Wenig)

AP Photo/Seth Wenig

The National September 11 Memorial and Museum are set for a memorial service, Monday, Sept. 11, 2017, in New York. Thousands of 9/11 victims’ relatives, survivors, rescuers and others are expected to gather Monday at the World Trade Center to remember the deadliest terror attack on American soil. Nearly 3,000 people died when hijacked planes slammed into the trade center, the Pentagon and a field near Shanksville, Pa., on Sept. 11, 2001. (AP Photo/Mark Lennihan)

AP Photo/Mark Lennihan

A man stands at the edge of a waterfall pool at ground zero during a ceremony on the 16th anniversary of the 9/11 attacks in New York, Monday, Sept. 11, 2017. Holding photos and reading names of loved ones lost 16 years ago, 9/11 victims’ relatives marked the anniversary of the attacks with a solemn and personal ceremony. (AP Photo/Seth Wenig)

AP Photo/Seth Wenig

President Donald Trump and first lady Melania Trump stand for a moment of silence to mark the anniversary of the Sept. 11 terrorist attacks, on the South Lawn of the White House, Monday, Sept. 11, 2017, in Washington. (AP Photo/Evan Vucci)

AP Photo/Evan Vucci

SHANKSVILLE, PA - SEPTEMBER 10: Family and friends of the victims carry candles at Flight 93 National MemorialÕs annual Luminaria on the eve of 16th Anniversary ceremony of the September 11th terrorist attacks, September 10, 2017 in Shanksville, PA. United Airlines Flight 93 crashed into a field outside Shanksville, PA with 40 passengers and 4 hijackers aboard on September 11, 2001. (Photo by Jeff Swensen/Getty Images) — Family and friends of the victims carry candles at Flight 93 National Memorial’s annual Luminaria on the eve of 16th Anniversary ceremony of the terrorist attacks of Sept. 11, 2001, Sept. 10, 2017 in Shanksville, PA. United Airlines Flight 93 crashed into a field outside Shanksville, PA with 40 passengers and 4 hijackers aboard on Sept. 11, 2001. (Photo by Jeff Swensen/Getty Images)

SHANKSVILLE, PA - SEPTEMBER 10: Visitors unfurl a commemorative flag at the Flight 93 National Memorial on the 16th Anniversary ceremony of the September 11th terrorist attacks, September 10, 2017 in Shanksville, PA. United Airlines Flight 93 crashed into a field outside Shanksville, PA with 40 passengers and 4 hijackers aboard on September 11, 2001. (Photo by Jeff Swensen/Getty Images) — Visitors unfurl a commemorative flag at the Flight 93 National Memorial on the 16th Anniversary ceremony of the terrorist attacks of Sept. 11, 2001, Sept. 10, 2017 in Shanksville, PA. United Airlines Flight 93 crashed into a field outside Shanksville, PA with 40 passengers and 4 hijackers aboard on Sept. 11, 2001. (Photo by Jeff Swensen/Getty Images)

SHANKSVILLE, PA - SEPTEMBER 10: A man pauses before a name on the wall during the Flight 93 National MemorialÕs annual Luminaria on the eve of 16th Anniversary ceremony of the September 11th terrorist attacks, September 10, 2017 in Shanksville, PA. United Airlines Flight 93 crashed into a field outside Shanksville, PA with 40 passengers and 4 hijackers aboard on September 11, 2001. (Photo by Jeff Swensen/Getty Images) — A man pauses before a name on the wall during the Flight 93 National Memorial’s annual Luminaria on the eve of 16th Anniversary ceremony of the terrorist attacks of Sept. 11, 2001, Sept. 10, 2017 in Shanksville, PA. United Airlines Flight 93 crashed into a field outside Shanksville, PA with 40 passengers and 4 hijackers aboard on Sept. 11, 2001. (Photo by Jeff Swensen/Getty Images)

SHANKSVILLE, PA - SEPTEMBER 10: Visitors listen to speakers at the groundbreaking of the Tower Of Voices at the Flight 93 National Memorial on the 16th Anniversary ceremony of the September 11th terrorist attacks, September 10, 2017 in Shanksville, PA. United Airlines Flight 93 crashed into a field outside Shanksville, PA with 40 passengers and 4 hijackers aboard on September 11, 2001. (Photo by Jeff Swensen/Getty Images) — Visitors listen to speakers at the groundbreaking of the Tower Of Voices at the Flight 93 National Memorial on the 16th Anniversary ceremony of the terrorist attacks of Sept. 11, 2001, Sept. 10, 2017 in Shanksville, PA. United Airlines Flight 93 crashed into a field outside Shanksville, PA with 40 passengers and 4 hijackers aboard on Sept. 11, 2001. (Photo by Jeff Swensen/Getty Images)

The Tribute in Light rises above the lower Manhattan skyline, Sunday, Sept. 10, 2017, in New York. The two blue pillars of light provide a visual reminder of how the Twin Towers, destroyed in the terrorist attacks of Sept. 11, 2001, once stood above the city skyline. (AP Photo/Mark Lennihan)

A couple embraces on the Brooklyn Promenade as the Tribute in Light rises above the lower Manhattan skyline Sunday, Sept. 10, 2017, in New York. The two blue pillars of light provide a visual reminder of how the Twin Towers, destroyed in the terrorist attacks of Sept. 11, 2001, once stood above the city skyline. (AP Photo/Mark Lennihan)

In this Friday, Sept. 8, 2017 photo, One World Trade Center overlooks the north reflecting pool of the National September 11 Memorial in New York. Monday will mark the sixteenth anniversary of the terrorist attacks. (AP Photo/Mark Lennihan)

In this Friday, Sept. 8, 2017 photo, the St. Nicholas National Shrine is under construction at the World trade Center in New York. The Greek Orthodox church will glow at night like a marble beacon when it opens sometime next year. It also will mark another step in the long rebuilding of New York's ground zero.(AP Photo/Mark Lennihan) — In this Friday, Sept. 8, 2017 photo, the St. Nicholas National Shrine is under construction at the World trade Center in New York. The Greek Orthodox church will glow at night like a marble beacon when it opens sometime next year. It also will mark another step in the long rebuilding of New York’s ground zero. (AP Photo/Mark Lennihan)

In this Friday, Sept. 8, 2017 photo, the National September 11 Memorial and Museum, bottom, is surrounded by high-rise towers in New York. The new towers are: WTC 1, second from left, WTC 7, third from left, WTC 3, second from right, and WTC 4, right. Monday will mark the sixteenth anniversary of the terrorist attacks. (AP Photo/Mark Lennihan) — In this Friday, Sept. 8, 2017 photo, the National September 11 Memorial and Museum, bottom, is surrounded by high-rise towers in New York. The new towers are: WTC 1, second from left, WTC 7, third from left, WTC 3, second from right, and WTC 4, right. Monday marks the sixteenth anniversary of the terrorist attacks. (AP Photo/Mark Lennihan)

NEW YORK, NY - SEPTEMBER 8: A commemorative wreath hangs along the Brooklyn Promenade with Lower Manhattan and One World Trade Center in the background, September 8, 2017 in New York City. New York City is preparing to mark the 16th anniversary of the September 11th terrorist attacks that struck New York City and Washington, DC in 2001. (Photo by Drew Angerer/Getty Images) — A commemorative wreath hangs along the Brooklyn Promenade with Lower Manhattan and One World Trade Center in the background, Sept. 8, 2017 in New York City. (Photo by Drew Angerer/Getty Images)

NEW YORK, NY - SEPTEMBER 8: A visitor pauses at the National September 11 Memorial, September 8, 2017 in New York City. New York City is preparing to mark the 16th anniversary of the September 11th terrorist attacks that struck New York City and Washington, DC in 2001. (Photo by Drew Angerer/Getty Images) — A visitor pauses at the National September 11 Memorial, Sept. 8, 2017 in New York City. (Photo by Drew Angerer/Getty Images)

NEW YORK, NY - SEPTEMBER 8: Visitors pause at the National September 11 Memorial, September 8, 2017 in New York City. New York City is preparing to mark the 16th anniversary of the September 11th terrorist attacks that struck New York City and Washington, DC in 2001. (Photo by Drew Angerer/Getty Images) — Visitors pause at the National September 11 Memorial, Sept. 8, 2017 in New York City. (Photo by Drew Angerer/Getty Images)

ANNAPOLIS, MD - SEPTEMBER 09: Navy Midshipmen stand arm and arm during a 9-11 tribute during the Navy and Tulane Green Wave game at Navy-Marine Corp Memorial Stadium on September 9, 2017 in Annapolis, Maryland. (Photo by Rob Carr/Getty Images) — Navy Midshipmen stand arm and arm during a 9/11 tribute during the Navy and Tulane Green Wave game at Navy-Marine Corp Memorial Stadium on Sept. 9, 2017 in Annapolis, Maryland. (Photo by Rob Carr/Getty Images)

President Barack Obama, First Lady Michelle Obama and Vice President Joe Biden join White House staff on the South Lawn of the White House to observe a moment of silence marking the 13th anniversary of the 9/11 attacks, Sept. 11, 2014. (Official White House Photo by Chuck Kennedy)

This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House. — President Barack Obama, First Lady Michelle Obama and Vice President Joe Biden join White House staff on the South Lawn of the White House to observe a moment of silence marking the 13th anniversary of the 9/11 attacks, Sept. 11, 2014. (Official White House Photo by Chuck Kennedy) This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House. (The White House/Chuck Kennedy)

This Sept. 3, 2016 photo shows a beam from the destroyed World Trade Center buildings, part of the 9/11 Memorial near the Veterans’ Pavilion at the Fulton County Fair, in Wauseon, Ohio. “We just don’t know where the events of 9/11 have lead us,” said Rick Sluder, fire chief in Wauseon, Ohio, which obtained the beam and, together with neighboring departments built the memorial. “A lot of people are looking at this as, is this point of downfall or the point at which we rose above the rest, the point of resiliency?” Sluder said. “I don’t think that’s been determined yet.” (Jetta Fraser/The Columbus Dispatch via AP)

Jetta Fraser/The Columbus Dispatch via AP

The names of 22 Prince William County residents who died on 9/11 are inscribed on the wall of the Pentagon shaped pool. (WTOP/Kathy Stewart)

Firefighters and volunteers gathered near the Pentagon Memorial on Saturday, August 27, 2016. They took a photo to honor the 15-year anniversary of the 9/11 attack on the Pentagon. (WTOP/Kathy Stewart)

In this Friday, Sept. 11, 2015 file photo, Landon Cole reaches out to touch steel beams from the World Trade Center on display at the The George W. Bush Presidential Library and Museum in Dallas. “They are the relics of the destruction and they have the same power in the same way as medieval relics that have the power of the saints,” said Harriet Senie, a professor of art history at the City University of New York and author of “Memorials to Shattered Myths: Vietnam to 9/11.” (AP Photo/LM Otero)

AP Photo/LM Otero

In this Friday, Aug. 26, 2016 photo, pedestrians walk by artist Heath Satow’s sculpture “Reflect,” made with a damaged, rusted I-beam from the collapsed World Trade Center buildings, outside the Rosemead, Calif., city hall plaza. The 9/11 memorial sculpture has 2,976 interlocking birds representing individual victims from the 2001 attacks. (AP Photo/Damian Dovarganes)

AP Photo/Damian Dovarganes

In this Friday, Sept. 11, 2009 file photo, a firefighter stands in the bucket of a telescopic ladder truck in Christchurch, New Zealand, over a memorial built from steel from the World Trade Center to mark eight years since the 9/11 attacks. More than 2,600 artifacts have gone to 1,585 fire and police departments, schools and museums, and other nonprofit organizations in every state and at least eight other countries. (AP Photo/Wayne Hamilton)

AP Photo/Wayne Hamilton

In this Wednesday, March 23, 2011 file photo, twisted beams and other remains from the attacks at the World Trade Center sit in Hangar 17 at New York’s John F. Kennedy International Airport. “They are the relics of the destruction and they have the same power in the same way as medieval relics that have the power of the saints,” says Harriet Senie, a professor of art history at the City University of New York and author of “Memorials to Shattered Myths: Vietnam to 9/11.” (AP Photo/Richard Drew)

AP Photo/Richard Drew

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