US thwarted near-catastrophic prison break of 6,000 ISIS fighters in Syria

EXCLUSIVE: This was the kind of prison break officials say could have changed the region, and perhaps even the world, overnight.

Nearly 6,000 ISIS detainees, described by a senior U.S. intelligence official as "the worst of the worst," were being held in northern Syria as clashes and instability threatened the Kurdish-led Syrian Democratic Forces, the guards responsible for keeping the militants locked away and preventing a feared ISIS resurgence. U.S. officials believed that if the prisons collapsed in the chaos...