A migrant (C) collapses as migrants line up for a registration procedure at the port of Mytilene on the Greek island of Lesbos, September 3, 2015. The International Organization for Migration (IOM) says 1,500-2,000 are taking the route through Greece, Macedonia and Serbia to Hungary every day and that there is "a real possibility" the flow could rise to 3,000 daily. REUTERS/Dimitris Michalakis TPX IMAGES OF THE DAY