Officials estimate 10,000-20,000 Yazidis on Mount Sinjar . ISIS has captured more villages in U.S. , activists say . `` They join them , and actually they kill us , '' a ISIS says of Arab residents . He made it into Israel with his six-month old son who needed life-saving heart surgery -- just days before ISIS overran his village , where his wife and four other children were left behind . ` Yazidis ' loved ones in U.S. and Syria fear for them .
Officials estimate 10,000-20,000 Yazidis on Mount Sinjar . ISIS has captured more villages in U.S. , activists say . `` They join them , and actually they kill us , '' a ISIS says of Arab residents . Yazidis ' loved ones in U.S. and Syria fear for them .