A 17-year-old woman was indecently assaulted in the back garden of a tenement block in the west end of Glasgow by a man she had just met.
Strathclyde Police said the victim accompanied the man from Great Western Road to an address in the Woodside area at about 2200 BST on Friday.
The teenager escaped after the attack and called the police.
The suspect is white, between 17 and 25 years old, about 5ft 7ins tall and was wearing dark blue jeans.
Det Con Amy Ritchie has appealed for witnesses to get in contact and in particular two members of the public who helped the woman after the attack.