Photos: World reacts to Brussels terror attacks

The Eiffel Tower is illuminated with the Belgium national colors black, yellow and red in honor of the victims of the today's attacks at the airport and the metro station in Brussels, in Paris, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and its subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Thibault Camus)
The Eiffel Tower is illuminated with the Belgium national colors black, yellow and red in honor of the victims of the today’s attacks at the airport and the metro station in Brussels, in Paris, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and its subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Thibault Camus) (AP/Thibault Camus)
The Belgian flag is projected on Rome's historical Trevi Fountain to honor the victims of the deadly attacks at Brussels airport and subway, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and its subway system prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Andrew Medichini)
The Belgian flag is projected on Rome’s historical Trevi Fountain to honor the victims of the deadly attacks at Brussels airport and subway, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and its subway system prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Andrew Medichini) (AP)
The Brandenburg Gate is illuminated with the Belgium national flag in reaction to the Brussels attacks, in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
The Brandenburg Gate is illuminated with the Belgium national flag in reaction to the Brussels attacks, in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber) (AP)
The Belgian Embassy in Washington, D.C. (WTOP/Matt Ritter)
The Belgian Embassy in Washington, D.C. (WTOP/Matt Ritter) (WTOP/Matt Ritter)
Flowers left at the base of the flagpole at the Belgian Embassy in Washington, D.C. (WTOP/Matt Ritter)
Flowers left at the base of the flagpole at the Belgian Embassy in Washington, D.C. (WTOP/Matt Ritter) (WTOP/Matt Ritter)
Chairman of the Danish Parliament, Pia Kjaersgaard, with flowers for the victims of the Brussels attacks, at the Belgium Embassy in Copenhagen Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding dozens of people, as a European capital was again locked down amid heightened security threats. The Islamic State group claimed responsibility for the attacks. (Philip Davali/POLFOTO via AP)  DENMARK OUT
Chairman of the Danish Parliament, Pia Kjaersgaard, with flowers for the victims of the Brussels attacks, at the Belgium Embassy in Copenhagen Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city’s metro stations Tuesday, killing and wounding dozens of people, as a European capital was again locked down amid heightened security threats. The Islamic State group claimed responsibility for the attacks. (Philip Davali/POLFOTO via AP) DENMARK OUT (AP/Davali Philip)
After  attacks in Brussels, a candle wrapped in a ribbon in the colors of the Belgium national flag and flowers are  placed on a table inside the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
After attacks in Brussels, a candle wrapped in a ribbon in the colors of the Belgium national flag and flowers are placed on a table inside the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber) (AP/Markus Schreiber)
The Belgian Embassy in central  London, with the country's national flag and the flag of the European Union at half staff following the attacks in Brussels, Tuesday, March, 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alastair Grant)
The Belgian Embassy in central London, with the country’s national flag and the flag of the European Union at half staff following the attacks in Brussels, Tuesday, March, 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alastair Grant) (AP/Alastair Grant)
The European and the Belgian national flag set on half staff  after terrorist attacks in Brussels in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
The European and the Belgian national flag set on half staff after terrorist attacks in Brussels in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber) (AP/Markus Schreiber)
Flowers, a candle and a letter with the words "The culture of freedom will survival your hate" placed after terrorist attacks in Brussels in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
Flowers, a candle and a letter with the words “The culture of freedom will survival your hate” placed after terrorist attacks in Brussels in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber) (AP/Markus Schreiber)
A woman lays flowers in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016, after Tuesday's terrorist attacks in Brussels. (AP Photo/Markus Schreiber)
A woman lays flowers in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016, after Tuesday’s terrorist attacks in Brussels. (AP Photo/Markus Schreiber) (AP/Markus Schreiber)
Flowers, a candle and a letter with the words 'Defy Terror' - ' Preserve Freedom' are  placed in front of the Belgian Embassy in Berlin, Germany, Tuesday, March 22, 2016 after the attacks in Brussels . Deadly attacks Tuesday at the Brussels airport and a metro station in the city are the latest in a string of attacks in Europe in recent years. (AP Photo/Markus Schreiber)
Flowers, a candle and a letter with the words ‘Defy Terror’ – ‘ Preserve Freedom’ are placed in front of the Belgian Embassy in Berlin, Germany, Tuesday, March 22, 2016 after the attacks in Brussels . Deadly attacks Tuesday at the Brussels airport and a metro station in the city are the latest in a string of attacks in Europe in recent years. (AP Photo/Markus Schreiber) (AP/Markus Schreiber)
Police officers perform security checks at Fiumicino airport, near Rome, Tuesday, March 22, 2016. The Italian Interior Ministry announced heightened security measures at major Italian airports following explosions at the Brussels airport and the subway system earlier Tuesday. (Telenews/ANSA via AP) ITALY OUT
Police officers perform security checks at Fiumicino airport, near Rome, Tuesday, March 22, 2016. The Italian Interior Ministry announced heightened security measures at major Italian airports following explosions at the Brussels airport and the subway system earlier Tuesday. (Telenews/ANSA via AP) ITALY OUT (AP)
French soldiers patrol in Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
French soldiers patrol in Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori) (AP)
An Israeli airport security guard patrols with a dog in Ben Gurion airport near Tel Aviv, Israel, Tuesday, March 22, 2016. After the Brussels attacks, Israel briefly announced that all Israeli flights from Europe were canceled, then reinstated the flights, Israel Airports Authority spokesman Ofer Leffler said. Pini Schiff, former director of security at Ben-Gurion Airport, said the attack in the Brussels airport was “a colossal failure” of Belgian security, and he said “the chances are very low” that such a bombing could take place in Israel’s airport. Israel's Ben-Gurion Airport is considered among the most secure in the world, an outcome stemming from several Palestinian attacks on Israeli planes and travelers in the 1970s. (AP Photo/Ariel Schalit)
An Israeli airport security guard patrols with a dog in Ben Gurion airport near Tel Aviv, Israel, Tuesday, March 22, 2016. After the Brussels attacks, Israel briefly announced that all Israeli flights from Europe were canceled, then reinstated the flights, Israel Airports Authority spokesman Ofer Leffler said. Pini Schiff, former director of security at Ben-Gurion Airport, said the attack in the Brussels airport was “a colossal failure” of Belgian security, and he said “the chances are very low” that such a bombing could take place in Israel’s airport. Israel’s Ben-Gurion Airport is considered among the most secure in the world, an outcome stemming from several Palestinian attacks on Israeli planes and travelers in the 1970s. (AP Photo/Ariel Schalit) (AP)
A member of the Counter Terrorism Centre (TEK) patrols the area in front of the Parliament in downtown Budapest, Hungary, Tuesday, March 22, 2016. Hungary raised its terrorism awareness level to grade 2 after a series of attacks in Brussels. (Zoltan Balogh/MTI via AP)
A member of the Counter Terrorism Centre (TEK) patrols the area in front of the Parliament in downtown Budapest, Hungary, Tuesday, March 22, 2016. Hungary raised its terrorism awareness level to grade 2 after a series of attacks in Brussels. (Zoltan Balogh/MTI via AP) (AP)
Barack Obama
President Barack Obama pauses as he speaks about the events in Brussels attack before addressing Cubans at El Gran Teatro de Havana, Tuesday, March 22, 2016, in Havana, Cuba. (AP Photo/Pablo Martinez Monsivais) (AP)
German Chancellor Angela Merkel arrives for a statement on the  attacks in Brussels at the chancellery in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
German Chancellor Angela Merkel arrives for a statement on the attacks in Brussels at the chancellery in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber) (AP/Markus Schreiber)
France's President Francois Hollande, center, addresses the medias while Belgium Ambassador to France Vincent Mertens de Wilmars, left, and French foreign minister Jean-Marc Ayrault look on, outside the Belgian embassy, in Paris, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding dozens of people, as a European capital was again locked down amid heightened security threats.  (AP Photo/Thibault Camus)
France’s President Francois Hollande, center, addresses the medias while Belgium Ambassador to France Vincent Mertens de Wilmars, left, and French foreign minister Jean-Marc Ayrault look on, outside the Belgian embassy, in Paris, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city’s metro stations Tuesday, killing and wounding dozens of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Thibault Camus) (AP)
U.S. Capitol Police officers stand guard outside at the entrance to the House of Representatives on Capitol Hill in Washington, Tuesday, March 22, 2016. Deadly explosions ripped through the Brussels airport and a subway station Tuesday during the morning rush hour, only days after the prime suspect in the Paris terror attacks Salah Abdeslam was arrested in Brussels.  (AP Photo/J. Scott Applewhite)
U.S. Capitol Police officers stand guard outside at the entrance to the House of Representatives on Capitol Hill in Washington, Tuesday, March 22, 2016. Deadly explosions ripped through the Brussels airport and a subway station Tuesday during the morning rush hour, only days after the prime suspect in the Paris terror attacks Salah Abdeslam was arrested in Brussels. (AP Photo/J. Scott Applewhite) (AP/J. Scott Applewhite)
French soldiers check unattended boxes left on the platform at Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
French soldiers check unattended boxes left on the platform at Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori) (AP/Francois Mori)
After deadly attacks on the Brussels airport and its subway system, a boy places a candle in front of the Belgian  Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
After deadly attacks on the Brussels airport and its subway system, a boy places a candle in front of the Belgian Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber) (AP/Markus Schreiber)
New York Army National Guard Staff Sgt. Rueter, foreground, of Joint Task Force Empire Shield, patrols the lower concourse of Grand Central Terminal, in New York,  Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels.  (AP Photo/Richard Drew)
New York Army National Guard Staff Sgt. Rueter, foreground, of Joint Task Force Empire Shield, patrols the lower concourse of Grand Central Terminal, in New York, Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels. (AP Photo/Richard Drew) (AP/Richard Drew)
A pair of Metro-North Railroad Police officers patrol in New York's Grand Central Terminal, Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels. (AP Photo/Richard Drew)
A pair of Metro-North Railroad Police officers patrol in New York’s Grand Central Terminal, Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels. (AP Photo/Richard Drew) (AP/Richard Drew)
Metro-North Railroad police officers patrol Grand Central Terminal, in New York,  Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels.  (AP Photo/Richard Drew)
Metro-North Railroad police officers patrol Grand Central Terminal, in New York, Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels. (AP Photo/Richard Drew) (AP/Richard Drew)
A pair of New York City Police Transit officers patrol in New York the subway station in Times Square,  Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels.  (AP Photo/Richard Drew)
A pair of New York City Police Transit officers patrol in New York the subway station in Times Square, Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels. (AP Photo/Richard Drew) (AP/Richard Drew)
European Union Foreign Policy Chief Federica Mogherini, reacts to the latest news on the Brussels attacks, during a news conference with Jordanian Foreign Minister Nasser Judeh in Amman, Jordan, Tuesday, March 22, 2016. Mogherini, fighting back tears, has stopped short a news conference in Jordan after saying that “today is a difficult day,” in reference to the Brussels attacks. (AP Photo)
European Union Foreign Policy Chief Federica Mogherini, reacts to the latest news on the Brussels attacks, during a news conference with Jordanian Foreign Minister Nasser Judeh in Amman, Jordan, Tuesday, March 22, 2016. Mogherini, fighting back tears, has stopped short a news conference in Jordan after saying that “today is a difficult day,” in reference to the Brussels attacks. (AP Photo) (AP/STR)
French soldiers patrol in Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
French soldiers patrol in Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori) (AP/Francois Mori)
French soldiers patrol in the subway entrance station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
French soldiers patrol in the subway entrance station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori) (AP/Francois Mori)
German police officers guard  a terminal of the airportthe  in Frankfurt, Germany, during tighter security measures  Tuesday, March 22, 2016, when various explosions hit the  Belgian capital  Brussels killing several people. (AP Photo/Michael Probst)
German police officers guard a terminal of the airportthe in Frankfurt, Germany, during tighter security measures Tuesday, March 22, 2016, when various explosions hit the Belgian capital Brussels killing several people. (AP Photo/Michael Probst) (AP/Michael Probst)
An armed British policeman stands on duty outside Horse Guards parade in central London, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alastair Grant)
An armed British policeman stands on duty outside Horse Guards parade in central London, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alastair Grant) (AP/Alastair Grant)
The Belgium and British flag fly at half staff above Downing Street in London, following the attacks in Brussels, Tuesday, March, 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Kirsty Wigglesworth)
The Belgium and British flag fly at half staff above Downing Street in London, following the attacks in Brussels, Tuesday, March, 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Kirsty Wigglesworth) (AP/Kirsty Wigglesworth)
Flowers are placed outside the embassy of Belgium, in Moscow, Russia, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Pavel Golovkin)
Flowers are placed outside the embassy of Belgium, in Moscow, Russia, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Pavel Golovkin) (AP/Pavel Golovkin)
Tourist police officers patrol the Red Square in Moscow, Russia, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/ Pavel Golovkin)
Tourist police officers patrol the Red Square in Moscow, Russia, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/ Pavel Golovkin) (AP/Pavel Golovkin)
Two soldiers from the Belgian Army patrol outside EU headquarters as EU flags fly at half mast after an explosion in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Virginia Mayo)
Two soldiers from the Belgian Army patrol outside EU headquarters as EU flags fly at half mast after an explosion in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Virginia Mayo) (AP/Virginia Mayo)
A Eurostar representative gives advice to a traveler after services were suspended on the Brussels Eurostar train route because of the attacks in Belgium, at St Pancras international railway station in London, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Matt Dunham)
A Eurostar representative gives advice to a traveler after services were suspended on the Brussels Eurostar train route because of the attacks in Belgium, at St Pancras international railway station in London, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Matt Dunham) (AP/Matt Dunham)
A Italian police dog sniffs passengers' luggage at Leonardo Da Vinci airport in Fiumicino, near Rome, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alessandra Tarantino)
A Italian police dog sniffs passengers’ luggage at Leonardo Da Vinci airport in Fiumicino, near Rome, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alessandra Tarantino) (AP/Alessandra Tarantino)
A woman places candles in the shape of a heart outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
A woman places candles in the shape of a heart outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert) (AP)
Japanese Prime Minister Shinzo Abe speaks to reporters condemning the terror attacks in Belgium, at Abe's official residence in Tokyo, Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said.(Franck Robichon/Pool Photo via AP)
Japanese Prime Minister Shinzo Abe speaks to reporters condemning the terror attacks in Belgium, at Abe’s official residence in Tokyo, Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said.(Franck Robichon/Pool Photo via AP) (AP/Franck Robichon)
A man looks at flowers and messages outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
A man looks at flowers and messages outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert) (AP/Geert Vanden Wijngaert)
Solidarity messages are written in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
Solidarity messages are written in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert) (AP/Geert Vanden Wijngaert)
Activists of Pakistani civil society chant slogans during a rally to condemn the Brussels attack, in Multan, Pakistan, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lock down of the Belgian capital and heightened security across Europe. Placard at left reads, "we want peace in the world." (AP Photo/Asim Tanveer)
Activists of Pakistani civil society chant slogans during a rally to condemn the Brussels attack, in Multan, Pakistan, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lock down of the Belgian capital and heightened security across Europe. Placard at left reads, “we want peace in the world.” (AP Photo/Asim Tanveer) (AP/Asim Tanveer)
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The Eiffel Tower is illuminated with the Belgium national colors black, yellow and red in honor of the victims of the today's attacks at the airport and the metro station in Brussels, in Paris, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and its subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Thibault Camus)
The Belgian flag is projected on Rome's historical Trevi Fountain to honor the victims of the deadly attacks at Brussels airport and subway, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and its subway system prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Andrew Medichini)
The Brandenburg Gate is illuminated with the Belgium national flag in reaction to the Brussels attacks, in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
The Belgian Embassy in Washington, D.C. (WTOP/Matt Ritter)
Flowers left at the base of the flagpole at the Belgian Embassy in Washington, D.C. (WTOP/Matt Ritter)
Chairman of the Danish Parliament, Pia Kjaersgaard, with flowers for the victims of the Brussels attacks, at the Belgium Embassy in Copenhagen Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding dozens of people, as a European capital was again locked down amid heightened security threats. The Islamic State group claimed responsibility for the attacks. (Philip Davali/POLFOTO via AP)  DENMARK OUT
After  attacks in Brussels, a candle wrapped in a ribbon in the colors of the Belgium national flag and flowers are  placed on a table inside the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
The Belgian Embassy in central  London, with the country's national flag and the flag of the European Union at half staff following the attacks in Brussels, Tuesday, March, 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alastair Grant)
The European and the Belgian national flag set on half staff  after terrorist attacks in Brussels in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
Flowers, a candle and a letter with the words "The culture of freedom will survival your hate" placed after terrorist attacks in Brussels in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
A woman lays flowers in front of the Belgium Embassy in Berlin, Germany, Tuesday, March 22, 2016, after Tuesday's terrorist attacks in Brussels. (AP Photo/Markus Schreiber)
Flowers, a candle and a letter with the words 'Defy Terror' - ' Preserve Freedom' are  placed in front of the Belgian Embassy in Berlin, Germany, Tuesday, March 22, 2016 after the attacks in Brussels . Deadly attacks Tuesday at the Brussels airport and a metro station in the city are the latest in a string of attacks in Europe in recent years. (AP Photo/Markus Schreiber)
Police officers perform security checks at Fiumicino airport, near Rome, Tuesday, March 22, 2016. The Italian Interior Ministry announced heightened security measures at major Italian airports following explosions at the Brussels airport and the subway system earlier Tuesday. (Telenews/ANSA via AP) ITALY OUT
French soldiers patrol in Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
An Israeli airport security guard patrols with a dog in Ben Gurion airport near Tel Aviv, Israel, Tuesday, March 22, 2016. After the Brussels attacks, Israel briefly announced that all Israeli flights from Europe were canceled, then reinstated the flights, Israel Airports Authority spokesman Ofer Leffler said. Pini Schiff, former director of security at Ben-Gurion Airport, said the attack in the Brussels airport was “a colossal failure” of Belgian security, and he said “the chances are very low” that such a bombing could take place in Israel’s airport. Israel's Ben-Gurion Airport is considered among the most secure in the world, an outcome stemming from several Palestinian attacks on Israeli planes and travelers in the 1970s. (AP Photo/Ariel Schalit)
A member of the Counter Terrorism Centre (TEK) patrols the area in front of the Parliament in downtown Budapest, Hungary, Tuesday, March 22, 2016. Hungary raised its terrorism awareness level to grade 2 after a series of attacks in Brussels. (Zoltan Balogh/MTI via AP)
Barack Obama
German Chancellor Angela Merkel arrives for a statement on the  attacks in Brussels at the chancellery in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
France's President Francois Hollande, center, addresses the medias while Belgium Ambassador to France Vincent Mertens de Wilmars, left, and French foreign minister Jean-Marc Ayrault look on, outside the Belgian embassy, in Paris, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding dozens of people, as a European capital was again locked down amid heightened security threats.  (AP Photo/Thibault Camus)
U.S. Capitol Police officers stand guard outside at the entrance to the House of Representatives on Capitol Hill in Washington, Tuesday, March 22, 2016. Deadly explosions ripped through the Brussels airport and a subway station Tuesday during the morning rush hour, only days after the prime suspect in the Paris terror attacks Salah Abdeslam was arrested in Brussels.  (AP Photo/J. Scott Applewhite)
French soldiers check unattended boxes left on the platform at Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
After deadly attacks on the Brussels airport and its subway system, a boy places a candle in front of the Belgian  Embassy in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
New York Army National Guard Staff Sgt. Rueter, foreground, of Joint Task Force Empire Shield, patrols the lower concourse of Grand Central Terminal, in New York,  Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels.  (AP Photo/Richard Drew)
A pair of Metro-North Railroad Police officers patrol in New York's Grand Central Terminal, Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels. (AP Photo/Richard Drew)
Metro-North Railroad police officers patrol Grand Central Terminal, in New York,  Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels.  (AP Photo/Richard Drew)
A pair of New York City Police Transit officers patrol in New York the subway station in Times Square,  Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels.  (AP Photo/Richard Drew)
European Union Foreign Policy Chief Federica Mogherini, reacts to the latest news on the Brussels attacks, during a news conference with Jordanian Foreign Minister Nasser Judeh in Amman, Jordan, Tuesday, March 22, 2016. Mogherini, fighting back tears, has stopped short a news conference in Jordan after saying that “today is a difficult day,” in reference to the Brussels attacks. (AP Photo)
French soldiers patrol in Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
French soldiers patrol in the subway entrance station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
German police officers guard  a terminal of the airportthe  in Frankfurt, Germany, during tighter security measures  Tuesday, March 22, 2016, when various explosions hit the  Belgian capital  Brussels killing several people. (AP Photo/Michael Probst)
An armed British policeman stands on duty outside Horse Guards parade in central London, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alastair Grant)
The Belgium and British flag fly at half staff above Downing Street in London, following the attacks in Brussels, Tuesday, March, 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Kirsty Wigglesworth)
Flowers are placed outside the embassy of Belgium, in Moscow, Russia, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Pavel Golovkin)
Tourist police officers patrol the Red Square in Moscow, Russia, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/ Pavel Golovkin)
Two soldiers from the Belgian Army patrol outside EU headquarters as EU flags fly at half mast after an explosion in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Virginia Mayo)
A Eurostar representative gives advice to a traveler after services were suspended on the Brussels Eurostar train route because of the attacks in Belgium, at St Pancras international railway station in London, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Matt Dunham)
A Italian police dog sniffs passengers' luggage at Leonardo Da Vinci airport in Fiumicino, near Rome, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alessandra Tarantino)
A woman places candles in the shape of a heart outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
Japanese Prime Minister Shinzo Abe speaks to reporters condemning the terror attacks in Belgium, at Abe's official residence in Tokyo, Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said.(Franck Robichon/Pool Photo via AP)
A man looks at flowers and messages outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
Solidarity messages are written in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
Activists of Pakistani civil society chant slogans during a rally to condemn the Brussels attack, in Multan, Pakistan, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lock down of the Belgian capital and heightened security across Europe. Placard at left reads, "we want peace in the world." (AP Photo/Asim Tanveer)

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