TOPSHOTS Migrants walk on train tracks towards the town of Gevgelija on July 27, 2015, on the Macedonian-Greek border, trying to catch a train to Serbia and the North European countries. The migrants, among them children and elderly people are trying to cross Macedonia and Serbia and enter the EU via Hungary. Hungarian authorities started building a fence along the country's border with Serbia earlier this week to halt the migrant influx. AFP PHOTO/ROBERT ATANASOVSKI