Syrian refugees and migrants gather near the highway on September 15, 2015, on their way to the border between Turkey and Bulgaria in the northwestern Turkish city of Edirne. Over half a million migrants have crossed the European Union's border so far this year, up from 280,000 in 2014, the bloc's Frontex border agency said on September 15, 2015 -- but warned some people may have been counted twice. AFP PHOTO / BULENT KILIC        (Photo credit should read BULENT KILIC/AFP/Getty Images)