A group of migrants walking on the road near a border line between Serbia and Croatia, near the village of Berkasovo, Serbia, Monday, Oct. 19, 2015. Tension was building among thousands of migrants as they remained stranded in fog and cold weather in the Balkans on Sunday in their quest to reach a better life in Western Europe, two days after Hungary closed its border with Croatia and the flow of people was redirected to a much slower route via Slovenia. (AP Photo/Darko Vojinovic)

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