SANLIURFA, TURKEY - JUNE 15: An Islamic State flag flies in the northern Syrian town of Tel Abyad as it is pictured from the Turkish border town of Akcakale, in Sanliurfa province, Turkey, June 15, 2015. Members of the Syrian Kurdish YPG militia took positions on the outskirts of the Islamic State stronghold of Tel Abyad. Thousands of Syrians cut through a border fence and crossed over into Turkey on Sunday, fleeing intense fighting in northern Syria between Kurdish fighters and jihadis.According to Turkish security officials 10,000 people to come across from Syria in last two days. (Photo by Gokhan Sahin/Getty Images)