POLICE have called for help from the public in the investigation of an alleged sexual assault on a 33-year-old woman who accepted a lift in north Canberra during the early hours of Friday morning.

Police say the woman had been walking alone from Belconnen toward Florey, along Joynton Smith Drive, Belconnen, and  Coulter Drive and John Cleland Drive, Florey, between 2.30am and 4am. A vehicle stopped and offered her a lift, which the woman accepted. She was then sexually assaulted.

Police are looking for witnesses who may have seen a woman in the vicinity during the early hours of Friday morning. Or from any witnesses who may have information about vehicles seen in the area at the time, or a vehicle stopped on the roadside at these locations.

Police can be contacted on 1800 333000 or via act.crimestoppers.com.au. Information can be provided anonymously.