Detectives have released a CCTV image of a man they would like to trace as part of an investigation into a serious assault at London Bridge that left the victim needing ten stitches for a wound on his face.
The British Transport Police says that the incident happened three months ago on Friday 18 September.
"A 31-year-old man from east London was making his way through the station to catch a Jubilee line train at when he bumped into a woman," said DC Carl Wayte, the investigating officer.
"He was then punched multiple times in the face and pushed to the ground by the man she was with."
The victim was taken to hospital for treatment and later released. He had suffered a large wound requiring stitches and temporary loss of feeling to one part of his face.
Officers are releasing the CCTV image after circulating images of the man on police intelligence systems and putting posters up at the station.
"We are determined to find the man responsible for this vicious attack, who we believe to be from east London," added DC Wayte.
"We have spoken to witnesses who came forward as a result of the poster appeal at the station, but we are now appealing for further information.
"I would like to hear from anyone who can identify the man in the image, who is wearing a distinctive green jacket."
Anyone who recognises the man in the image or who has any information that could assist the investigation into this incident is asked to contact British Transport Police on 0800 40 50 40 quoting incident number 551 of 18/09/2009.