A woman was hit in the face with a baseball cap whilst travelling on a bus.
The 18 year old victim +was on board the 2A bus from Lancaster to Morecambe.
The assault is believed to have happened at or near The York Hotel on Lancaster Road.
Police have released CCTV images of a woman they would like to speak to in connection with the assault.
The woman was believed to have been under the influence of alcohol and was in company with a man.
Sergeant James Martin said: “If anybody recognises the woman in the CCTV then please contact police.
“I am also keen to speak to anyone who has any information at all about this incident.”
The incident occurred at 4.55pm on Thursday, February 21.
Anybody with any information can contact police on 101 or Crimestoppers anonymously on 0800 555 111 or on-line at Crimestoppers-uk.org.