Police in Londonderry are investigating a serious sexual assault in the city on Saturday night.
A 17-year-old girl left the Strand Bar with a man at about 2330 BST.
She returned to her friends in a distressed and dishevelled state at about 0100 BST on Sunday and was taken to hospital for examination.
The alleged attacker is described as in his 20s, about 5 ft 11 ins with short dark hair and wearing a blue/black check shirt.
Police are appealing for anyone with information to come forward.
