Police are appealing for witnesses after a 72-year-old man was punched and kicked by a group of teenagers at St Pancras international station.
The attack happened on Thursday 19th December at around 10.30am as a First Capital Connect train arrived on Platform A.
Officers have released three CCTV images of people they would like to talk to in connection with the incident.
The victim, who is from Cricklewood, says he saw a group of four or five teenagers throwing sweets at passengers and asked them to stop.
One of the teenagers then punched him in the face. He was apparently punched and kicked again as he left the train.
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Peter Barnett made hundreds of trips from his home in Oxfordshire to Marylebone station without paying the full fare.
Police say he may have attacked more children and urged them to come forward.
The suspect walked up to a Tesco employee and shoulder barged him to the ground before punching him repeatedly in the face.