Migrants wave after boarding a train near the southern Macedonian town of Gevgelija, Friday, Dec. 4, 2015. Greek riot police struggled to maintain order on Friday after clashes between asylum-seekers at the country's border with Macedonia. Macedonia is allowing only people from Afghanistan, Iraq and Syria to cross the border, and groups of people from other nationalities have set up makeshift roadblocks, preventing anyone from crossing. (AP Photo/Visar Kryeziu), APTOPIX