Police are investigating the rape of a 15-year-old girl in the grounds of a school in Derry.
The girl is believed to have been walking home through Foyle College on Northland Road at around 11pm on Friday when she was attacked by a stranger.
Police say she was on her own at the time.
The attacker was described as a young man, aged 17 or 18, with a shaved head. He had an English accent.
He was around 5ft 9in, of slim build, and was wearing a dark shirt and either tracksuit bottoms or jeans.
The PSNI's Ballymena Rape Crime Unit is investigating.
They have appealed for anyone with information to get in contact with them.