FILE- Syrian families wait to register at the UNHCR center in the northern city of Tripoli, Lebanon, in this file photo dated Wednesday, March 6, 2013. The number of U.N.-registered refugees topped 1 million in March 2013 and half of them are known to be children, as Syrians flee from their war-ravaged country, and the United Nations’ refugee agency warn that Syria is heading towards a "full-scale disaster." (AP Photo/Bilal Hussein, FILE)