Serbian border police stop Kosovars, who are trying to cross the border to Hungary, as they walk in a field near the town of Subotica, near the Serbian-Hungarian border, on February 6. #

Hungarian police control camera on a tower on the border between Serbia and Hungary, not far from the northern Serbian town of Subotica, on February 10. Serbian security forces have stepped up patrols and deployed an elite unit on the border with Hungary, trying to prevent an illegal flow of migrants that has triggered alarm in many European Union countries. #

Clothes left by illegal immigrants lay in woods near Asotthalom, southern Hungary, on December 16, 2014. The mayor of a southern Hungarian village is proposing to build a fence to keep out the growing number of irregular migrants coming across the nearby border with Serbia. The forests of Asotthalom have become a popular stop for migrants, most of them from Kosovo, seeking to reach Germany and other destinations in Western Europe. #

Migrants gather around the fire which they use for cooking and for warmth in an abandoned brick factory in the northern Serbian town of Subotica, near the border between Serbia and Hungary, on December 15, 2014. Coming from as far away as Afghanistan and Syria and as near as Kosovo and Albania, thousands of irregular migrants a week are crossing into Hungary and requesting asylum, turning the country into a new hot spot in a transit route into the EU. #

A pair of shoes belonging to a child lie in a snow-covered field in the northern Serbian village of Backi Vinogradi near the Hungarian border on February 9. During the past several weeks a large number of Kosovo Albanians tried to illegally enter the EU, mainly via Hungary, as they were fleeing economic hardship in their country. Kosovo is one of Europe's poorest nations with one third of its population of 1.8 million being unemployed and some 40 percent living in poverty. #

A group of Afghan asylum seekers walk over a field in an attempt to illegally cross the Serbian-Hungarian border from the northern Serbian village of Backi Vinogradi on February 9. #

A Kosovar woman holds her child as they warm up around an open fire after they crossed illegally the Hungarian-Serbian border near the village of Asotthalom on February 6. #

A group of Kosovars stand near a road, after being detained by Serbian border police while trying to cross the border to Hungary, near the town of Subotica, on February 6. #

Kosovar Albanians arrive at a police station after being arrested as they tried to illegally pass the border near the northern Serbian city of Subotica close to the Hungarian border on February 9. #

A Kosovar Albanian woman hugs her child at a police station where a group of Kosovar Albanians were brought in after being arrested as they tried to illegally pass the border near the northern Serbian city of Subotica on February 9. #

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

An Afghan child sits in a Serbian border police vehicle after a group of Afghan asylum seekers were detained for illegally trying to cross the Serbian-Hungarian border in the northern Serbian village of Backi Vinogradi on February 9, 2015. #