Several hundred migrants are camping along Serbia’s borders, sleeping rough in makeshift shelters in harsh winter weather, AP reports. Aid groups distributed food and warm drinks in an abandoned factory near Croatia’s border, as migrants are looking for a chance to cross into neighboring EU countries. Officials and aid groups say that some 300-400 migrants have been staying out in the open while an additional 4,000 are in asylum camps in Serbia. Thousands have been stranded in Serbia since “the Balkan migrant route” was closed down in March 2016 to stem the flow into the EU. Many migrants try to cross the borders illegally with the help of smugglers.