The BBC has uncovered details of a secret deal that let hundreds of IS fighters and their families escape from Raqqa, under the gaze of the US and British-led coalition and Kurdish-led forces who control the city.

A convoy included some of IS’s most notorious members and – despite reassurances – dozens of foreign fighters. Some of those have spread out across Syria, even making it as far as Turkey.
http://www.bbc.co.uk/news/resources/...s_dirty_secret