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Open Image ModalPeople stand in front of the Brandenburg Gate, in Berlin, Germany, which is illuminated in black, yellow and red in the colors of the Belgian flag, in tribute to victims of the Brussels attacks on March 22, 2016. (credit:Fabrizio Bensch/Reuters)
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Open Image ModalThe black, yellow, and red colors of the Belgian flag are projected on the Trevi fountain in Rome, Italy, in tribute to the victims of Brussels\' bomb attacks March 22, 2016. (credit:Stefano Rellandini/Reuters)
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Open Image ModalThe black, yellow, and red colors of the Belgian flag are projected on the courthouse in Lyon, France, in tribute to the victims of today\'s Brussels bomb attacks, March 22, 2016. (credit:Robert Pratta/Reuters)
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Open Image ModalTwo people write solidarity messages in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016. (credit:Geert Vanden Wijngaert/AP)
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Open Image ModalA man walks by solidarity messages written in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016, following the deadly explosions. (credit:Geert Vanden Wijngaert/AP)
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Open Image ModalA man looks at flowers and messages outside the stock exchange in Brussels on Tuesday, March 22, 2016. (credit:Geert Vanden Wijngaert/AP)
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Open Image ModalPeople leave candles and flowers in tribute to victims of triple bomb attacks in front of the stock exchange building in the city center of Brussels on March 22, 2016. (credit:NICOLAS MAETERLINCK/AFP/Getty Images)
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Open Image ModalPeople write messages on the ground at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. (credit:KENZO TRIBOUILLARD/AFP/Getty Images)
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Open Image ModalPeople walk over messages written on the ground at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. (credit:KENZO TRIBOUILLARD/AFP/Getty Images)
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Open Image ModalActivists of the Azov civil corp commemorate the victims of Tuesday\'s Brussels attacks near the Belgian embassy in Kiev, Ukraine, March 22, 2016. (credit:Valentyn Ogirenko/Reuters)
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Open Image ModalAfter 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. (credit:Markus Schreiber/AP)
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Open Image ModalFlowers and candles for the victims of today\'s Brussels attacks, are placed on the steps of the Belgian embassy in Berlin, Germany, March 22, 2016. (credit:Fabrizio Bensch/Reuters)
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Open Image ModalThe sign by these flowers outside the Belgium embassy in Berlin reads, \"Defy terror, protect freedom.\" (credit:ODD ANDERSEN/AFP/Getty Images)
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Open Image ModalFrench deputies hold a minute of silence for the Brussels victims at the start of a questions session in France\'s government on March 22, 2016, in Paris. (credit:ERIC FEFERBERG/AFP/Getty Images)
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Open Image ModalPeople place flowers for the victims of the Brussels attacks, in front of the Belgian embassy in Moscow, Russia, March 22, 2016. (credit:Maxim Zmeyev/Reuters)
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Open Image ModalAn embassy worker moves the Belgian flag to half mast in tribute to victims of the Brussels attacks, at the Belgian embassy in Moscow, Russia, March 22, 2016. (credit:Maxim Zmeyev/Reuters)
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Open Image ModalA European Union flag flies at half mast on the roof of the European Parliament information office in Helsinki, Finland, 22 March, 2016. (credit:Aku Hayrynen/Lehtikuva/Reuters)
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Open Image ModalA European Union flag flies at half mast in commemoration of the victims of today\'s Brussels attacks,on top of Parliament in Vienna, Austria. (credit:Leonhard Foeger/Reuters)
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Open Image ModalA woman leaves a bouquet of flowers in the Belgian national colors next to a French national flag with the lettering \'Paris - Brussels - Solidarity\' at the fence of the Belgian embassy in Paris on March 22, 2016. (credit:THOMAS SAMSON/AFP/Getty Images)
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Open Image ModalA motorcyclist lays flowers at the steps of the Belgian Embassy following the terrorist attacks in Brussels on March 22, 2016 in Berlin, Germany. (credit:Sean Gallup/Getty Images)
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Open Image ModalActivists of Pakistani civil society chant slogans during a rally to condemn the Brussels attack, in Multan, Pakistan, Tuesday, March 22, 2016. (credit:Asim Tanveer/AP)
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Open Image ModalAn Austrian national flag flies at half mast in commemoration of the victims of today\'s Brussels attacks, on top of Parliament in Vienna, Austria, March 22, 2016. (credit:Leonhard Foeger/Reuters)
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Open Image ModalA European Union flag and an Austrian national flag fly at half mast in commemoration of the victims of the Brussels attacks, on top of the Presidential office in Vienna, Austria, March 22, 2016. (credit:Leonhard Foeger/Reuters)
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Open Image ModalThe Belgian national flag is raised as a mark of respect at Downing Street on March 22, 2016, in London, England. (credit:Ben Pruchnie/Getty Images)
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Open Image ModalPeople take part in a rally on the Palazzo di Citta square in Turin, Italy, in memory of the victims of the attacks in Brussels on March 22, 2016. (credit:MARCO BERTORELLO/AFP/Getty Images)
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Open Image ModalDanish Prime Minister, Lars Lokke Rasmussen, pays his respects with the Belgian Ambassador Pol De Witte at the Belgium Embassy in Copenhagen on Tuesday, March 22, 2016. (credit:Philip Davali/POLFOTO/AP)
Hungary Belgium Attacks(27 of43)
Open Image ModalNagyardei Stadium is illuminated with the Belgian national colours in Debrecen, 226 kms east of Budapest, Hungary, Tuesday, March 22, 2016 to pay tribute to victims of the terrorist attacks committed earlier Tuesday in Brussels, the capital of Belgium. Dozens of people were killed and more than 200 injured when bombs were detonated at Brussel\'s Zaventem international airport and at a metro station of the city. (Balazs Mohai/MTI via AP) (credit:ASSOCIATED PRESS)
Belgium Attacks(28 of43)
Open Image ModalWriting on the asphalt reads \"More stars in Brussel\'s heaven\" at Place de la Bourse in the center of Brussels, where people write hundreds of messages on the ground to remember the victims of todays attack, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city\'s metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner) (credit:ASSOCIATED PRESS)
Belgium Attacks(29 of43)
Open Image ModalPeople put the Brussel\'s mascot statue with a Belgian flag to mourn for the victims at Place de la Bourse in the center of Brussels, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city\'s metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner) (credit:ASSOCIATED PRESS)
People lay flowers at Belgian Embassy in Paris(30 of43)
Open Image ModalPARIS, FRANCE - MARCH 22: French people leave French flag and flowers to pay respect to Belgium after Brussels Terror attack, at the Belgian Embassy in Paris, France on March 22, 2016. (Photo by Geoffroy Van der Hasselt/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Parisians Gather At Hotel de Ville As A Show Of Solidarity Following Brussels Attacks(31 of43)
Open Image ModalPARIS, FRANCE - MARCH 22: (FRANCE OUT) People leave candle messages on the front of the Hotel de Ville to pay tribute to the victims of the terrorists attacks in Belgium on March 22, 2016 in Paris, France. 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 Nicolas Kovarik/IP3/Getty Images) (credit:Nicolas Kovarik/IP3 via Getty Images)
Parisians Gather At Hotel de Ville As A Show Of Solidarity Following Brussels Attacks(32 of43)
Open Image ModalPARIS, FRANCE - MARCH 22: (FRANCE OUT) People leave chalk messages in front of the Hotel de Ville to pay tribute to the victims of the terrorists attacks in Belgium on March 22, 2016 in Paris, France. 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 Nicolas Kovarik/IP3/Getty Images) (credit:Nicolas Kovarik/IP3 via Getty Images)
Brussels Airport And Metro Rocked By Explosions(33 of43)
Open Image ModalBRUSSELS, 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) (credit:Sylvain Lefevre via Getty Images)
Brussels Airport And Metro Rocked By Explosions(34 of43)
Open Image ModalBRUSSELS, 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) (credit:Sylvain Lefevre via Getty Images)
Brussels Airport And Metro Rocked By Explosions(35 of43)
Open Image ModalBRUSSELS, 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) (credit:Sylvain Lefevre via Getty Images)
Brussels Airport And Metro Rocked By Explosions(36 of43)
Open Image ModalBRUSSELS, 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) (credit:Sylvain Lefevre via Getty Images)
Parisians Gather At Hotel de Ville As A Show Of Solidarity Following Brussels Attacks(37 of43)
Open Image ModalPARIS, FRANCE - MARCH 22: (FRANCE OUT) People gather on the front of the Hotel de Ville to pay tribute to the victims of the terrorists attacks in Belgium on March 22, 2016 in Paris, France. 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 Nicolas Kovarik/IP3/Getty Images) (credit:Nicolas Kovarik/IP3 via Getty Images)
Parisians Gather At Hotel de Ville As A Show Of Solidarity Following Brussels Attacks(38 of43)
Open Image ModalPARIS, FRANCE - MARCH 22: (FRANCE OUT) People gather on the front of the Hotel de Ville to pay tribute to the victims of the terrorists attacks in Belgium on March 22, 2016 in Paris, France. 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 Nicolas Kovarik/IP3/Getty Images) (credit:Nicolas Kovarik/IP3 via Getty Images)
Parisians Gather At Hotel de Ville As A Show Of Solidarity Following Brussels Attacks(39 of43)
Open Image ModalPARIS, FRANCE - MARCH 22: (FRANCE OUT) People leave chalk messages outside of the Hotel de Ville to pay tribute to the victims of the terrorists attacks in Belgium on March 22, 2016 in Paris, France. 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 Nicolas Kovarik/IP3/Getty Images) (credit:Nicolas Kovarik/IP3 via Getty Images)
Zaventem Airport And Brussels Metro Station Targeted By Deadly Bomb Blasts(40 of43)
Open Image ModalMessages of condolence and support sit chalked at Beursplein square in Brussels, Belgium, on Tuesday, March 22, 2016. Explosions ripped through the Brussels airport departure hall and a downtown subway station on Tuesday morning, causing deaths and injuries and spurring fears of imminent follow-up attacks in the capital of the European Union. Photographer: Jasper Juinen/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
Zaventem Airport And Brussels Metro Station Targeted By Deadly Bomb Blasts(41 of43)
Open Image ModalMessages of condolence and support sit chalked at Beursplein square in Brussels, Belgium, on Tuesday, March 22, 2016. Explosions ripped through the Brussels airport departure hall and a downtown subway station on Tuesday morning, causing deaths and injuries and spurring fears of imminent follow-up attacks in the capital of the European Union. Photographer: Jasper Juinen/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
Zaventem Airport And Brussels Metro Station Targeted By Deadly Bomb Blasts(42 of43)
Open Image ModalMessages of condolence and support sit chalked at Beursplein square in Brussels, Belgium, on Tuesday, March 22, 2016. Explosions ripped through the Brussels airport departure hall and a downtown subway station on Tuesday morning, causing deaths and injuries and spurring fears of imminent follow-up attacks in the capital of the European Union. Photographer: Jasper Juinen/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
Zaventem Airport And Brussels Metro Station Targeted By Deadly Bomb Blasts(43 of43)
Open Image ModalMessages of condolence and support sit chalked at Beursplein square in Brussels, Belgium, on Tuesday, March 22, 2016. Explosions ripped through the Brussels airport departure hall and a downtown subway station on Tuesday morning, causing deaths and injuries and spurring fears of imminent follow-up attacks in the capital of the European Union. Photographer: Jasper Juinen/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)