A string of explosions hit the airport and a nearby metro station in Brussels, Belgium, on March 22, killing at least 32 people, a figure which doesn't include the three dead attackers, and injuring scores more. The attacks came days after the capture of Salah Abdeslam, a key terror suspect in the Paris attacks earlier this year. The world has mourned victims of the attacks.
Sonia (surname withheld) embraces her children Mateo and Alessia at the Place de la Bourse as she pays her respects to victims following terrorist attacks on March 23, 2016 in Brussels, Belgium. Belgium observed three days of national mourning after at least 32 people were killed in a twin suicide blast at Zaventem Airport and a further bomb attack at Maelbeek Metro Station.
Riot police attend a memorial site during a protest by right wing demonstrators at the Place de la Bourse in Brussels, Sunday, March 27, 2016.
People observe a one minute silence at the Place De La Bourse on March 23, 2016, in honor of the victims of the terror attacks in Brussels, Belgium.
Police guard a check point during a police raid in the suburb of Schaerbeek in Brussels, Friday, March, 25, 2016. Belgium's prime minister refused to accept the resignations of his justice and interior ministers Thursday despite increasing evidence of intelligence and law enforcement failures to prevent suicide bombings by Islamic militants.
Police officers guard a cordoned-off area during a raid off of Place General Meiser in the Schaarbeek district on March 25, 2016, in Brussels, Belgium. Explosions from police flash grenades and bomb disposal units were heard by neighbors and a suspect was shot in the leg and taken into custody during the operation, which was related to the arrest of 34-year-old Reda Kriket in Paris, who had been found with explosives and weapons in his apartment expected to be used for a foiled terrorist plot. Earlier in the week in the same neighborhood as the raid, police discovered bomb-making material in an apartment used by the suicide bombers carrying out the attacks at Brussels Zaventem airport and Maelbeek/Maalbeek train station that killed at least 31 people and injured over 200.
Belgium soldiers patrol around the main court building where Salah Abdeslam, the top suspect in last year's deadly Paris attacks, was expected to appear before a judge in Brussels, Belgium, Thursday, March 24, 2016, days after attacks struck the Belgian capitol. The Islamic State group has trained at least 400 fighters to target Europe in deadly waves of attacks, deploying interlocking terror cells like the ones that struck Brussels and Paris with orders to choose the time, place and method for maximum carnage.
A man looks down as he stands at a memorial site located at the old stock exchange in Brussels on Wednesday, March 23, 2016.
Belgian Federal Police via AP
Three men who are suspected of taking part in the attacks at Belgium's Zaventem Airport and are being sought by police. The man on the right was yet unidentified, but the two men on the left were identified by the Federal Prosecutors office on brothers Khalid and Ibrahim El Bakraoui.
A woman looks at a poster of a missing person at a memorial for victims of attacks in Brussels on Wednesday, March 23, 2016.
AP Photo/Frederic Sierakowski, Pool
Belgium's King Philippe, center left, and Belgium's King Philippe, center right, lay a wreath with firefighters in front of the damaged Zaventem Airport terminal in Brussels on Wednesday, March 23, 2016. Belgian authorities were searching Wednesday for a top suspect in the country's deadliest attacks in decades, as the European Union's capital awoke under guard and with limited public transport after scores were killed and injured in bombings on the Brussels airport and a subway station.
A woman covers her face near Maelbeek metro station on March 23, 2016 in Brussels, Belgium, the day after terrorist bombers struck that station and the airport.
A man reacts as people gather to observe a minute of silence in memory of the victims of the Brussels airport and metro bombings, on the Place de la Bourse in central Brussels, on March 23, 2016, a day after the triple blasts killed left around 250 injured. World leaders united in condemning the carnage in Brussels and vowed to combat terrorism, after Islamic State bombers killed at least 31 people at the symbolic heart of the EU.
Armed soldiers guard the entrance to Brussels Central Station after yesterday's terrorist attacks on March 23, 2016 in Brussels, Belgium.
Belgian Army soldiers patrol at Zaventem Airport in Brussels on Wednesday, March 23, 2016.
Secretary of State John Kerry participates in wreath-laying with a firefighter at Brussels Airport in Brussels, Belgium, Friday, March 25, 2016.
People chalk messages of support on the walls of the Bourse De Brussels building in the Place de la Bourse a day after terrorists attacks hit Brussels, Belgium, on March 23, 2016.
Police and other emergency workers stand in front of the damaged Zaventem Airport terminal in Brussels on Wednesday, March 23, 2016.
A woman and a young girl embrace as people gather to leave tributes at the Place de la Bourse on Tuesday in Brussels, Belgium.
People hold up a banner as a mark of solidarity at the Place de la Bourse on March 22, 2016 in Brussels, Belgium.
A small girl sits among candles set up at a memorial site located at the old stock exchange in Brussels on Wednesday, March 23, 2016.
A man plays the cello as people gather at a makeshift memorial at Place de la Bourse (Beursplein) following the attacks in Brussels on Tuesday.
A woman holding flowers cries outside the Maalbeek metro station in Brussels, Belgium on March 23, 2016.
Two young boys look on as people gather to leave tributes at the Place de la Bourse following the attacks on Tuesday, March 22, 2016, in Brussels, Belgium.
An emergency responder holds his face in his hands as he returns from the Maalbeek metro station in Brussels, Belgium, on March 23, 2016.
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." People around the world rallied in solidarity with the city of Brussels following terrorist attacks there.
Madrid's mayor, Manuela Carmena and leader of left-wing party Podemos, Pablo Iglesias observe a minute of silence for the attacks in Brussels, in front of Madrid's city-hall at the Cibeles square in Madrid on March 22, 2016.
A woman arrives with flowers at a cordoned-off area near Maelbeek - Maalbeek subway station in Brussels on March 23, 2016, a day after triple bomb attacks in the Belgian capital killed at least 31 people and left more than 200 people wounded.
Police search passenger bags at the Central Station in Brussels on Wednesday, March 23, 2016.
A police tape is placed across the closed Schuman metro station outside EU headquarters in Brussels on Wednesday, March 23, 2016.
Official White House Photo by Pete Souza
President Barack Obama and National Security Advisor Susan E. Rice receive updates on the attacks in Brussels on the phone. Obama and Rice made the call from the residence of the U.S. Chief of Mission in Havana, Cuba, March 22, 2016.
Rescue teams evacuate wounded people outside the Maalbeek metro station in Brussels on March 22, 2016 after a blast at the station, located near the EU headquarters.
A victim receives first aid by rescuers on Tuesday, March 22, 2016, near the Maalbeek metro station in Brussels, after a blast at the station caused deaths and injuries.
A man with blood stains on his sweater leaves Brussels airport in Zaventem on March 22, 2016, following twin blasts.
People are evacuated from Brussels Airport, in Zaventem, on March 22, 2016.
In this photo provided by Georgian Public Broadcaster and photographed by Ketevan Kardava, two women sit wounded in Brussels Airport after explosions were heard Tuesday, March 22, 2016.
The Military Hospital in northern Brussels handed out an X-ray image of a person injured during the Brussels terror attacks on March 22, 2016, who seems to have a nail or screw in their chest. Authorities found an unexploded bomb in raids following the attacks that contained nails and glass as shrapnel.
Firefighters arrive at a security perimeter set in the Rue de la Loi near the Maalbeek subway station in Brussels on March 22, 2016, after an explosion.
People react outside Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016.
Broken glass and blood is seen outside an entrance to Maelbeek metro station following an attack on March 22, 2016, in Brussels, Belgium.
An injured man lies amongst debris following a suicide bombing at Brussels Zaventem airport on March 22, 2016, in Brussels, Belgium. Georgian journalist Ketevan Kardava, special correspondent for the Georgian Public Broadcaster, was travelling to Geneva when the attack took place, she was knocked to the floor and began to take photographs in the moments that followed.
People stand near Brussels airport after being evacuated, Brussels, Belgium, Tuesday March 22, 2016. Authorities in Brussels locked down the Belgian capital after explosions rocked the airport and subway system, killing at least 31 people and injuring many more.
People react as they walk away from Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016.
Photo courtesy of Jef Versele
Debris is seen at the check-in zone of Brussels Airport Tuesday, March 22, 2016, after twin explosions went off in a terrorist attack claimed by the Islamic State.