Asians sought over Bolton rape
Police say the attacker was Asian, medium build and had black spiky hair, he was wearing a distinctive black top emblazoned with a diamante or 'bling' motif across the chest, and he was also wearing blue jeans.
The girl, in her late teens, was treated at St Mary's Centre in Manchester.
Detective Sergeant Rob Parker, of Bolton CID, said: “We are carrying out a thorough investigation to try and find out who is responsible for this attack and I believe someone living locally will know the culprit.”
He went on to say "There is no cause for alarm but it is only right we make people in the community aware of what has happened.”
Anyone with information is asked to call police on 0161 856 5740, or the independent charity Crimestoppers, anonymously, on 0800 555 111.