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Airport workers and their relatives in Brussels, Belgium, hold a candlelight vigil Wednesday, March 23, to pay tribute to those who were killed in terrorist attacks the day before. On Tuesday, explosions rocked the city's airport and a subway station. PHILIPPE HUGUEN/AFP/Getty Images
Belgian national flags are projected onto the National Gallery in London's Trafalgar Square on March 23. Matt Dunham/AP
A woman in Brussels pauses after people observed a minute of silence at the Place de la Bourse on March 23. Christopher Furlong/Getty Images
Teresa Mancheno, a maintenance worker at Newark Liberty International Airport, attends a vigil in Newark, New Jersey, on March 23. Julio Cortez/AP
European Union flags fly at half-staff outside the European Commission in Brussels on March 23. PATRIK STOLLARZ/AFP/Getty Images
A young girl lights a candle at the Place de la Bourse in Brussels on Tuesday, March 22. Carl Court/Getty Images
An image of the Belgian flag is displayed on the Trevi Fountain in Rome on March 22. GABRIEL BOUYS/AFP/Getty Images
The Eiffel Tower is lit up with the colors of the Belgian flag on March 22. Marc Piasecki/Getty Images
Servicemen with Azov, a Ukrainian volunteer battalion, hold torches during a tribute ceremony at the Belgian Embassy in Kiev, Ukraine, on March 22. ANATOLII STEPANOV/AFP/Getty Images
U.S. President Barack Obama and his family observe a moment of silence as they attend a baseball game in Havana, Cuba, with Cuban President Raul Castro, right, on March 22. Ismael Francisco/Cubadebate via AP
A woman reads messages written on the ground at Brussels' Place de la Bourse on March 22. KENZO TRIBOUILLARD/AFP/Getty Images
A New York City church holds Mass for victims of the Brussels attacks on March 22. Spencer Platt/Getty Images
A man places flowers outside the Belgian Embassy in Moscow on March 22. KIRILL KUDRYAVTSEV/AFP/Getty Images
A man looks at flowers and messages outside the stock exchange in Brussels on March 22. Geert Vanden Wijngaert/AP
Democratic presidential candidate Hillary Clinton, center, stands for a moment of silence during a roundtable with tribal leaders in Puyallup, Washington, on March 22. Carolyn Kaster/AP
A woman leaves a bouquet of flowers at the base of the Belgium and European Union flags, which were flying at half-staff March 22 at the Belgian Embassy in Washington. Al Drago/CQ Roll Call/getty images
Activists in Multan, Pakistan, condemn the Brussels attack on March 22. Asim Tanveer/AP
A woman lays flowers at the steps of the Belgian Embassy in Berlin on March 22. Sean Gallup/Getty Images
A boy at a makeshift migrant camp shows support for the victims near the village of Idomeni, Greece, on March 22. ANDREJ ISAKOVIC/AFP/Getty Images
Mayors of Istanbul districts walk with consuls from various countries, including Belgium, during a protest condemning terrorism on March 22. Islam Yakut/Anadolu Agency/Getty Images
People in Turin, Italy, take part in a rally to remember the victims on March 22. MARCO BERTORELLO/AFP/Getty Images
France's Parliament observes a minute of silence on March 22. ERIC FEFERBERG/AFP/Getty Images
Members of Quebec's National Assembly have a moment of silence on March 22. Jacques Boissinot/The Canadian Press via AP
