A teenager has suffered a serious sexual assault in the centre of York.
North Yorkshire Police said the 18-year-old victim was in the Coney Street area of the city when she was attacked between 0200 and 0420 GMT.
Detectives said the teenager was assaulted by a 5ft 8in to 6ft tall white "skinny" man who had short dark hair.
Police are making inquiries and aiming to recover evidence at the scene to identify the man.
Det Insp Steve Smith, of York CID, said: "The investigation is still in its early stages but it is crucial that we locate and speak to this man to assist our inquiries."
Mr Smith said he also wanted to speak to anyone who may have witnessed the attack or recalled seeing anything suspicious in the Coney Street area between 0200 and 0420 GMT.
He added: "The victim has been left very shocked and upset by the ordeal and she is receiving support from specially trained officers.
"Her care is of paramount importance in this investigation."