Images have been released by police investigating an attempted robbery and common assault at Osterley Tube station.
A 21-year-old man was punched and pulled to the floor before station staff intervened, British Transport Police (BTP) said.
The victim suffered minor facial injuries during the attack, which took place on November 20.
He had just got off the train at 2.55pm when he was attacked by a group of men who had been travelling on the same train, BTP said.
November stabbings
He was punched in the face and pulled to the floor, before the offenders demanded his phone and threatened to stab him.
At this point a member of staff at the London Underground station intervened and was also pushed.
The member of staff told the offenders to leave the station and then took the victim to the booking office before the offenders eventually left the scene, according to BTP.
Officers from BTP would like to speak to the men shown in the CCTV images as they may have information which could help the investigation.
Anyone with information about the incident, can call BTP on 0800 40 50 40 or text 61016, quoting reference number 314 of 20 November.
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