Thousands of people have already fled across border to escape fighting between the YPG and ISIS near Tel Abyad at Turkey's border.

Yesterday The Syrian Kurdish YPG militia said it began an advance towards an ISIS-held town at the Turkish border, thrusting deeper into the terrorist’s stronghold of Raqqa province.

While Kurdish fighters advanced Saturday to the outskirts of a key Syrian border town, Turkish forces sought to prevent thousands fleeing the fighting from crossing the frontier, AFP reports.