Syrian Kurds cross the border from Syria into Turkey at the southeastern town of Suruc in Sanliurfa province, on September 23, 2014. UNHCR, the United Nations refugee agency, warned that as many as 400,000 people may flee to Turkey from Syria's Kurdish region to escape attacks by ISIS militants. #

Turkish soldiers stand guard as Syrians wait behind the border fences near the Turkish town of Suruc on September 18, 2014. Thousands of men, women and children arrived at the Turkish border roughly 10 km (6 miles) from the besieged city of Ayn al-Arab, known as Kobani in Kurdish, a Reuters witness said, as Turkish forces initially stopped the crowd from crossing. #

Syrian refugees wait to cross into Turkey at the border near Suruc, Turkey, on September 22, 2014. On September 19, permission was granted from Ankara, and Turkey opened part of its border to Syria to the refugees. #

Syrian Kurds throw a dead sheep as they protest asking for water for their animals on the Syrian side of the border with Turkey at the southeastern town of Suruc on September 23, 2014. #

Syrian Kurds cross the border from Syria into Turkey near the town of Suruc on September 20, 2014. Tens of thousands of Syrian Kurds flooded into Turkey, fleeing an onslaught by the jihadist ISIS group. #

Smoke rises after Protection of the Kurdish People (YPG) fighters hit a target as they clash with possible ISIS fighters near the Syrian side of the Turkish border on September 22, 2014. #

Riot police use water cannons to disperse Kurdish demonstrators who were clashing with Turkish security forces, as thousands of Syrian refugees continue to arrive at the border in Suruc, Turkey, on September 22, 2014. #

Riot police use teargas to disperse Kurdish demonstrators who were clashing with Turkish security forces as thousands of Syrian refugees continue to arrive at the border on September 22, 2014. #

Kurdish protestors clash with Turkish soldiers near the Syrian border after Turkish authorities temporarily closed the border, blocking young Syrian Kurds who had accompanied their families to safety inside Turkey from returning to the battlefront, on September 22, 2014. #

A Kurdish man bleeds after being injured while walking in the center of Suruc during clashes between protestors and Turkish riot policemen near the Syrian border on September 22, 2014. #

Kurdish protestors clash with Turkish soldiers near the Syrian border after Turkish authorities temporarily closed the border, blocking young Syrian Kurds who had accompanied their families to safety inside Turkey from returning to the battlefront, on September 22, 2014. #

Dalil Boras, a 19-year-old Kurdish militant who has been fighting the Islamic State group in Syria, speaks to the Associated Press in Suruc, Turkey, on September 21, 2014. Dalil brought his family over the border to Turkey to safety Sunday. But in the tranquility of a Turkish tea garden a few miles from the border, he vowed to head back to the fight Sunday night. #

Syrian Kurds carry their belongings after crossing the Syrian-Turkish border at the southeastern town of Suruc in Sanliurfa province on September 23, 2014. The UN refugee agency warned Tuesday that as many as 400,000 people may flee to Turkey from Syria's Kurdish region to escape attacks by the ISIS militant group. #