Secret US-backed deal allowed hundreds of ISIS fighters, with tonnes of weapons and ammunition, to escape Raqqa

The deal to let IS fighters escape from Raqqa – de facto capital of their self-declared caliphate – had been arranged by local officials. It came after four months of fighting that left the city obliterated and almost devoid of people. It would spare lives and bring fighting to an end. The lives of the Arab, Kurdish and other fighters opposing IS would be spared.