In this photo taken Thursday, Feb. 26, 2015, a piece of a torn up transit certificate issued to some migrants by the authorities as they enter Serbia is seen meters from the Serbian border with Hungary close to Kelebija, 150 kilometers north of Belgrade, Serbia. (AP Photo/Marko Drobnjakovic)
In this photo taken Thursday, Feb. 26, 2015, a piece of a torn up transit certificate issued to some migrants by the authorities as they enter Serbia is seen meters from the Serbian border with Hungary close to Kelebija, 150 kilometers north of Belgrade, Serbia. (AP Photo/Marko Drobnjakovic)
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