Migrants wait to register with the police at a refugee center in the southern Serbian town of Presevo, Monday, Nov. 16, 2015. Refugees fleeing war by the tens of thousands fear the Paris attacks could prompt Europe to close its doors, especially after police said a Syrian passport found next to one attacker's body suggested its owner passed through Greece into the European Union and on through Macedonia and Serbia last month. (AP Photo/Darko Vojinovic) ** FILE **
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