Kurdish People’s Protection Units (YPG) fighters gather at the eastern entrances to the town of Tel Abyad of Raqqa governate June 14, 2015. Kurdish-led militia backed by U.S.-led air strikes fought Islamic State near a Syrian town at the Turkish border on Sunday, a monitoring group and a Kurdish official said, in an advance that has worried Turkey. Picture taken June 14, 2015. REUTERS/Rodi Said