BRUSSELS, BELGIUM - MARCH 22: People light candles at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People gather to sing songs as a mark of solidarity at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People gather to leave tributes at the Place de la Bourse following today's terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Sylvain Lefevre/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: A message which says Love BXL is written on the ground as people leave tributes at the Place de la Bourse as people leave tributes at the Place de la Bourse following today's terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Sylvain Lefevre/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: A sign which reads "we need blood, make a donation" is displayed on the ground near sign as mark of solidarity as people leave tributes at the Place de la Bourse following today's terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Sylvain Lefevre/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: A man lights a candle as people gather to leave tributes at the Place de la Bourse following today's terrorist attacks on March 22, 2016 in Brussels, Belgium. (Photo by Sylvain Lefevre/Getty Images)
Brussels Airport And Metro Rocked By Explosions
Candles are lit in the shape of a heart as people gather to leave tributes at the Place de la Bourse following the attacks in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People light candles at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: A woman and a young girl embrace as people gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: A woman lights a candle as people gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: A message is written on a wall following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: Flowers are placed into the mouth of a lion statue as people gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People applaud as they gather around tributes left at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: Two people embrace at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: Two young boys look on as people gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
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<> on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels.
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: Messages are written on the floor as people leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: Messages are written on the floor at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: People leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: A young boy helps light a candle as people leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: A young boy helps light a candle as people leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Brussels Airport And Metro Rocked By Explosions
BRUSSELS, BELGIUM - MARCH 22: Tributes are left at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Increased Police Presence At Penn Station After Brussels Attacks
At least 34 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Credit: Getty Images)
Attack In Brussels
Passengers evacuate the Brussels Airport, in Zaventem, on March 22, 2016, after a string of explosions rocked Brussels airport and a city metro station. (Photo: DIRK WAEM/AFP/Getty Images)
Attack In Brussels
A Belgian soldier stands guard outside the Maalbeek metro station in Brussels on March 22, 2016 after a blast at this station located near the EU institutions.
(Photo: CEDRIC SIMON/AFP/Getty Images)
Attack In Brussels
People are evacuated from Brussels airport in Zaventem on March 22, 2016 following twin blasts.
(Photo: DIRK WAEM/AFP/Getty Images)
Merkel Gives Statement Following Brussels Terror Attacks
German Chancellor Angela Merkel gives a statement to the media following today's terrorist attacks in Brussels on March 22, 2016 in Berlin, Germany. (Photo by Sean Gallup/Getty Images)
Attack In Brussels
This picture shows the airport board panel at the Frankfurt Airport, with a canceled flight to Brussels, on March 22, 2016, in Frankfurt, western Germany.
(Photo: BORIS ROESSLER/AFP/Getty Images)
Attack In Brussels
A picture taken on March 22, 2016 shows Belgian police and emergency staff arriving in the Wetstraat - Rue de la Loi, which has been evacuated after an explosion at the Maelbeek metro station in Brussels.(LAURIE DIEFFEMBACQ/AFP/Getty Images)
Attack In Brussels
(LtoR) Federal Prosecutor Frederic Van Leeuw, Belgian Prime Minister Charles Michel and Vice-Prime Minister and Interior Minister Jan Jambon give a press conference after the multiple explosions in Brussels at the airport and in the Brussels' metro, on March 22, 2016 in Brussels.
(Photo: NICOLAS MAETERLINCK/AFP/Getty Images)
Brussels Airport And Metro Rocked By Explosions
Police forensic officers attend Maelbeek metro station following todays attack on March 22, 2016 in Brussels, Belgium. (Photo by Carl Court/Getty Images)
Attack In Brussels
Passengers wait, on March 22, 2016 near Brussels airport in Zaventem, following its evacuation after twin blasts rocked the main terminal of Brussels airport. (Photo: JOHN THYS/AFP/Getty Images)
Attack In Brussels
Passengers are evacuated from Brussels airport, on March 22, 2016 in Zaventem, after at least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport.AFP PHOTO / JOHN THYS / AFP / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
Attack In Brussels
Passengers are evacuated from Brussels airport, on March 22, 2016 in Zaventem(JOHN THYS/AFP/Getty Images)
Attack In Brussels
A picture shows the shattered glass facade of the departure hall of Brussels Airport in Zaventem following twin blasts on March 22, 2016. (Photo: JOHN THYS/AFP/Getty Images)
Attack In Brussels
Passengers are evacuated from Brussels airport, on March 22, 2016 in Zaventem(JOHN THYS/AFP/Getty Images)
Attack In Brussels
Policemen speak at a security perimeter near Maalbeek metro station, on March 22, 2016 in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. (EMMANUEL DUNAND/AFP/Getty Images)
Attack In Brussels
Firefighters arrive at a security perimeter set near Maalbeek metro station, on March 22, 2016 in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. ( EMMANUEL DUNAND/AFP/Getty Images)
Increased Police Presence At Penn Station After Brussels Attacks
Increase police presence at Penn Station after Brussels attacks on March 22, 2016. (credit: Marla Diamond/WCBS 880)
Attack In Brussels
A victim receives first aid by rescuers, on March 22, 2016 near Maalbeek metro station in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. ( EMMANUEL DUNAND/AFP/Getty Images)
Attack In Brussels
Passengers are evacuated from Brussels airport, on March 22, 2016 in Zaventem. (JOHN THYS/AFP/Getty Images)
Attack In Brussels
People are evacuated from Brussels Airport, in Zaventem, on March 22, 2016 after two explosions in a hall of the airport.
(Credit: Getty Images)
Attack In Brussels
Belgium policemen stand guards at a security perimeter near Maalbeek metro station, on March 22, 2016 in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. ( EMMANUEL DUNAND/AFP/Getty Images)
Attack In Brussels
Passengers are evacuated from Brussels airport, on March 22, 2016 in Zaventem(JOHN THYS/AFP/Getty Images)
Attack In Brussels
Crew and passengers are evacuated by bus from Zaventem Bruxelles International Airport after terrorist attacks on March 22, 2016 in Brussels, Belgium. (Photo by Sylvain Lefevre/Getty Images)
Attack In Brussels
A policeman gestures near a security perimeter set in the Rue de la Loi near the Maalbeek subway station, in Brussels, on March 22, 2016. (NICOLAS MAETERLINCK/AFP/Getty Images)
Attack In Brussels
A picture taken on March 22, 2016 shows damage to the front of Brussels airport in Zaventem. (Photo: DIRK WAEM/AFP/Getty Images)
Attack In Brussels
People are evacuated from Brussels Airport, in Zaventem, on March 22, 2016. (VIRGINIE LEFOUR/AFP/Getty Images)
Brussels Airport And Metro Rocked By Explosions
The European Union flag flies at half mast outside EU Commission Headquarters following todays attack on March 22, 2016 in Brussels, Belgium. (Photo by Carl Court/Getty Images)
Attack In Brussels
Passengers are evacuated from Brussels airport, on March 22, 2016 in Zaventem. (JOHN THYS/AFP/Getty Images)
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Crews are evacuated from Zaventem Bruxelles International Airport after terrorist attcks on March 22, 2016 in Brussels, Belgium. (Photo by Sylvain Lefevre/Getty Images)
Attack In Brussels
The military police carries extra patrols at Schiphol Airport in Amsterdam, on March 22, 2016 in response to the attacks in the departure hall of Brussels Airport and at a Brussels metro station. (EVERT ELZINGA/AFP/Getty Images)
Attack In Brussels
A victim receives first aid by rescuers, on March 22, 2016 near Maalbeek metro station in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. (EMMANUEL DUNAND/AFP/Getty Images)
Brussels Airport And Metro Rocked By Explosions
Alert Level Orange sign is seen on an EU Commission building following todays attack on March 22, 2016 in Brussels, Belgium.(Photo by Carl Court/Getty Images)
Attack In Brussels
Passengers are evacuated from Brussels airport, on March 22, 2016 in Zaventem, after twin blasts rocked the main terminal of Brussels airport. (Photo: JOHN THYS/AFP/Getty Images)