See Migrants Make Their Way From Serbia to Hungary

Afghan migrants trek their way to the Serbian border with Hungary close to Hajdukovo, 90 miles north of Belgrade, Serbia on Feb. 17, 2015,

Marko Drobnjakovic—AP

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A watchtower left over from the Cold War era is seen meters away from the Serbian border with Hungary close to Kelebija, 90 miles north of Belgrade, Serbia on Feb. 26, 2015,

Marko Drobnjakovic—AP

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Migrants rest in the makeshift camp near the abandoned brick factory in the northern Serbian town of Subotica, near the border between Serbia and Hungary, on Dec. 15, 2014,

Darko Vojinovic—AP

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Migrants from Afghanistan rest at an abandoned house on the outskirts of Subotica, 90 miles north of Belgrade, Serbia on Feb. 26, 2015,

Marko Drobnjakovic—AP

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A graffiti in Arabic letters is seen on a wall of an abandoned factory used as a resting point by migrants on the outskirts of Subotica, 90 miles north of Belgrade, Serbia on Feb. 26, 2015.

Marko Drobnjakovic—AP

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Migrants gather around the fire which they use for cooking and for warmth in the abandoned brick factory in the northern Serbian town of Subotica, near the border between Serbia and Hungary, on Dec. 15, 2014.

Darko Vojinovic—AP

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Members of the German border police sit in a van as they check a security camera while monitoring a stretch of the Serbian border with Hungary in the village of Hajdukovo, some 110 miles north of Belgrade, Serbia on Feb. 13, 2015.

Darko Vojinovic—AP

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Migrants are detained by a Hungarian civil guard after being caught on the Hungarian-Serbian border near Roszke, south of Szeged, 100 miles south of Budapest, Hungary on Jan. 19, 2015.

Szilard Koszticsa—EPA

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A migrant detained by the Hungarian police after illegally crossing the border with Serbia peers out of a window of a police bus in Asotthalom, some 110 miles southeast of Budapest, Hungary, on Feb. 18, 2015.

Marko Drobnjakovic—AP

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Discarded children's clothes are seen laying in a field meters away from the Serbian border with Hungary close to Horgos, 90 miles north of Belgrade, Serbia on Feb. 26, 2015.

Marko Drobnjakovic—AP

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Migrants, who said they were from Afghanistan, sit on a ground after being apprehended by the Serbian border police for having illegally entered the country from Macedonia, near the town of Presevo some 240 miles from capital Belgrade, Serbia on April 29, 2015.

Marko Djurica—Reuters

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Migrants sleep in a park near the main Belgrade's bus and train station, Serbia on April 24, 2015.

Marko Djurica—Reuters

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