DOBOVA, SLOVENIA - OCTOBER 22: Migrant children look through a metal fence as they rest at a temporary holding area after being escorted by police from the Croatian and Slovenia border October 22, 2015 in Dobova, Slovenia. Thousands of migrants marched across the border from Croatia into Slovenia as authorities intensify their efforts to attempt to cope with a human tide unseen in Europe since World War II. (Photo by Jeff J Mitchell/Getty Images)
