A train sexual offender has been arrested after his teenage victim secretly took a photograph of him following the attack.
The unnamed 18-year-old, who has been praised for her bravery, was indecently touched by Rotherham-born Raja Hussain while they was on a train to Sheffield.
Once he got off the train and the doors closed, the University of Sheffield student covertly took a picture of Hussain through the window, and passed it on to the British Transport Police.