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Belgian military personnel and police stand guard around the central Station in Brussels on March 22, 2016 as people are allowed in small group of ten, to reach the station in order to take their commuter trains, following co-ordinated attacks at the Airport serving the Belgian capital and its Metro system. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bombs blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. / AFP / EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)

Belgian military personnel and police stand guard around the central Station in Brussels on March 22, 2016 as people are allowed in small group of ten, to reach the station in order to take their commuter trains, following co-ordinated attacks at the Airport serving the Belgian capital and its Metro system.   
Airlines cancelled hundreds of flights and European railways froze links with Brussels  after a series of bombs blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. / AFP / EMMANUEL DUNAND        (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)