Turkish forces approached a key Kurdish-held town in northern Syria on Sunday, setting off clashes that allowed hundreds of Islamic State supporters to escape from a camp for displaced people and prompted U.S. soldiers to withdraw from a nearby base. The camp in Ein Eissa, some 35 kilometers (20 miles) south of the border, is home to some 12,000 people, including 1,000 wives and widows of Islamic State fighters and their children. The Kurdish-led administration in northern Syria said in a statement that 950 IS supporters escaped after attacking guards and storming the gates.