Police want to speak to this man about an assault in the car park at Aylesbury Railway station.
The incident happened at around 11pm on December 12.
PC Liam Deasley said: “Five teenagers were approached by a man who asked them for a light. One of them let the man use a lighter, but as he handed it back an argument started. The man then made a phone call, after which three other men arrived at the station, and the teenagers were attacked.
“Fortunately nobody was seriously injured, but this was still a nasty assault which left two of the boys with cuts and bruises.”
Any witnesses can contact British Transport Police on 0800 40 50 40.