Erbil, Iraq —  CBS News found empty cells and abandoned orange jumpsuits on Monday inside a prison in northeast Syria that, until days ago, held suspected ISIS militants. The incident has highlighted lingering security concerns for Washington in the wake of Syria's brutal civil war.  Syria's Interior Ministry accused the U.S.-backed Kurdish Syrian Democratic Forces (SDF) of allowing about 120 ISIS detainees to escape from the Al-Shaddadi prison — which is less than two miles from an American