A teenage girl was found with serious head injuries in Lewsey Park last night.
A member of the public found the girl, thought to be 15 years old, at 8.35pm and she was taken to hospital.
She is described as being in a serious condition.
A full search of the area is being carried out and Scenes of Crime Officers are attending the scene.
Det Insp Iain Morgan said: “We are piecing together the circumstances surrounding how the young woman was injured and believe the injuries were caused by an assault. This area is busy even during the evening and it is possible that residents and pedestrians may have heard or seen a person running from the area during the evening. These people may be able to help piece together exactly what happened to this young girl and I would urge them to contact the police urgently with any information they may have.”
Call Beds Police on 101 with information.