Hundreds of people affiliated with the Islamic State escaped a camp where they were being held on Sunday after Turkish forces approached the Kurdish-held town, Kurdish officials said.

About 950 ISIS-connected foreigners managed to leave the camp, located in Ain Eissa, roughly 20 miles south of the border, after detainees apparently attacked the camp’s guards and gates and fled, the Kurdish-led administration said in a statement.

The Syrian Observatory for Human Rights, based in Britain, said Turkish warplanes struck villages near the camp on Sunday. They didn’t provide the exact number of residents who fled the camp, but said clashes broke out between Turkey-backed Syrian fighters and Kurdish forces.