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Associated Press
Migrants wait to board a train at the train station in Sid, about 100 km (62 miles) west from Belgrade, Serbia, during U.S. Sen. John McCain, unseen, visit on Friday, Feb. 12, 2016.  Sen. McCain and a U.S. Congress delegation pledged assistance to Serbia and other countries along the Balkan migrant route. (AP Photo/Darko Vojinovic)

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