'Islamic State's' most wanted - Part 3: IS fight back
As the teenager's online presence grew, 'Islamic State' took action against those it suspected of working with them.
Producer/reporter: Chloe Hadjimatheou
Arabic language producer: Faisal Irshaid
Video editor: Amanda Gunn
Camera: Tony Jolliffe
Animator: Wael Toubaji
Executive producer: Richard Knight