Islamic State fighters who return to the UK 'must face justice'

More than 400 people who fought for the group, also called ISIS and Daesh, are thought to have then returned to the UK, after travelling to the Middle East. Crawford gave evidence to parliament's Joint Committee on Human Rights (JCHR), which in a new report has warned that none of the ISIS supporters who had made their way back to the UK had been successfully prosecuted. She first met Yazidi women captured by ISIS in 2014, and has covered the topic a number of times since, including most recently in the 10 Years Of Darkness: ISIS & The Yazidis documentary.