A woman in her late teens has been subjected to a serious sex attack after a night out in Bicester.
Thames Valley Police said today that she had left a public house in Sheep Street at around 2.50am on Saturday morning.
She walked through Market Square with the offender, then they entered an alleyway in the Chapel Street area where she was raped.
The offender is described as white, in his late thirties to early forties, around 5ft 10ins tall with a skinny build.
He had short dark hair with silver/grey sides and spoke with a foreign accent, and is also believed to have a spot or mole on his left cheek. He was dressed in a dark jacket.
The victim is being offered support by specially-trained officers. Detectives are carrying out an investigation into the circumstances of the incident.