A man has been left with a broken collarbone and two missing teeth after being assaulted at Liverpool Street station in London.
The victim was attacked at one of the entrances after 3.30pm on September 19.
After being found with serious injuries, he was taken to a nearby hospital for treatment.
The man suffered a broken collarbone, a deep cut to his head which required staples, and lost two teeth in the assault.
Those involved had left the station before police arrived and no arrests have been made yet.
British Transport Police (BTP) has released images of two men that officers want to speak to in connection with the attack.
Police believe the pair may have information which could help with their investigation.
Anyone who recognizes the men or has information about the assault is asked to text BTP on 61016 or call 0800 40 50 40, quoting reference 456 of September 19.
Information can also be passed anonymously to Crimestoppers on 0800 555 111.