BERKASOVO, SERBIA - OCTOBER 21: Migrants wait to cross the border between Serbia and Croatia on October 21, 2015 near the village of Berkasovo in Serbia. Tension was building among hundreds of migrants as they remained stranded overnight in cold and wet conditions in the Balkans as they try to continue their journey north in their search for a better life in Western Europe. . (Photo by Jeff J Mitchell/Getty Images)
