Macedonian police officers help a dehydrated migrant, who accompanied by a fellow migrant try to get to the transit center for migrants, after crossing the border from Greece to Macedonia, near southern Macedonian town of Gevgelija, on Monday, Aug. 31, 2015. Thousands of migrants have poured into Macedonia and board trains and buses that are taking them a step closer to the European Union. (AP Photo/Boris Grdanoski)