The blown out facade of the terminal is seen at Zaventem airport, one of the sites of two deadly attacks in Brussels, Belgium, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after the attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Peter Dejong)
The blown out facade of the terminal is seen at Zaventem airport, one of the sites of two deadly attacks in Brussels, Belgium, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after the attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Peter Dejong) Peter Dejong AP
The blown out facade of the terminal is seen at Zaventem airport, one of the sites of two deadly attacks in Brussels, Belgium, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after the attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Peter Dejong) Peter Dejong AP