BRUSSELS, BELGIUM - MARCH 23: A heavily-armed Belgian police officer stands guard outside the De Brouckere metro station on March 23, 2016 in Brussels, Belgium. Belgium is observing three days of national mourning after 34 people were killed in a twin suicide blast at Zaventem Airport and a further bomb attack at Maelbeek metro station. Two brothers are thought to have carried out the airport attack and an international manhunt is underway for a third suspect. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Adam Berry/Getty Images)
Getty Images

Getty Images News Adam Berry