In light of the BBC investigation, the coalition now admits the part it played in the deal. Some 250 IS fighters were allowed to leave Raqqa, with 3,500 of their family members.
“We didn’t want anyone to leave,” says Col Ryan Dillon, spokesman for Operation Inherent Resolve, the Western coalition against IS.
“But this goes to the heart of our strategy, ‘by, with and through’ local leaders on the ground. It comes down to Syrians – they are the ones fighting and dying, they get to make the decisions regarding operations,”