A man was left unconscious with a head injury after he was attacked by two people on a train in Glasgow on the night of a football match.
The incident occurred on the 11.33pm service travelling from Shettleston to Easterhouse on Wednesday, February 2.
British Transport Police said a fight broke out between the victim and two other men, which continued until the train reached Easterhouse station.
The man was then further assaulted and left unconscious with a head injury.
One man was identified at the scene in connection with the incident, however officers are looking to trace another man who is described as being white, of stocky build with short dark hair.
At the time of the incident, he was wearing a black jacket, with dark jeans and black trainers.
British Transport Police said the service was busy as passengers travelled home following a football match between Celtic and Rangers in the city and urged anyone who may have witnessed the incident to come forward.
Anyone with information can contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 633 of February 2.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.