Migrants walk in the field near a border line between Serbia and Croatia, near the village of Berkasovo, Serbia, Wednesday, Oct. 21, 2015. Croatia, which has erected relatively few shelters along its borders with Serbia and Slovenia, directed thousands into special trains and bus convoys Tuesday to Slovenia in an apparently concerted effort to clear a backlog built up since Saturday, when Hungary closed its borders with Croatia. (AP Photo/Darko Vojinovic)
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