Queen Paola of Belgium and King Albert II of Belgium arrive for a royal remembrance service at the Royal Palace in Brussels, on May 22, 2016 in tribute to the victims of Brussels' attacks of March 22.
Two bombers blew themselves up at the check-in area of Brussels airport, while a third detonated his explosives at Maalbeek - Maelbeek metro station near the EU headquarters on March 22 leaving 31 people dead and hundreds of injured. Islamic State group (IS) claimed responsibility for the attacks. / AFP / POOL / DANNY GYS / Belgium OUT        (Photo credit should read DANNY GYS/AFP/Getty Images)