Turn them over to the Syrians.
Better yet the Kurds.
I rode that bus both ways about six months after the "massacre". According to some people I spoke with when we were in a moving car and away from being overheard the number of (Sunni) residents who survived the shelling and were then loaded on to trucks never to be seen again was in the 40,000 plus range. So yeah, The Syrians can handle the ISIS prisoners if no one else will.