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epa04618193 Officers of the German Federal Police's First International Operation Unit sit in an observation vehicle using a thermal camera near the Serbian-Hungarian border town of Subotica, 180 km north of Belgrade, Serbia, 13 February 2015. Twenty German federal police officers have been deployed to Serbia to help secure an unfenced border with Hungary which has become the route of choice for the traffickers moving Kosovars into the European Union. Hungary, Germany, Austria, Switzerland, Sweden and Belgium have all seen a spike in immigration from Kosovo starting in December 2014, according to the International Organization for Migration (IOM). EPA/EDVARD MOLNAR HUNGARY OUT