A commuter was taken to A&E after being assaulted on a train in the early hours of the morning.
The 41-year-old victim was travelling in a first class carriage on the 11.24pm service from London to Northampton on Friday, November 14. Throughout the journey, a man and a woman were talking to various passengers within the carriage.
As the train pulled into Milton Keynes at 12.20am the man assaulted the victim, causing a cut underneath his left eye which required treatment at A&E.
The attacker was white, about 5ft 11in, in his late twenties and wore a T-shirt with horizontal stripes and dark denim jeans. He was with a white woman, about 5ft 3ins, of slim build, with shoulder-length dark hair. She was wearing a khaki jacket and denim jeans and was carrying a handbag.
Anyone who witnessed the incident is asked to call British Transport Police on Freefone 0800 405040 or text 61016. Alternatively call Crimestoppers, anonymously, on 0800 555 111.
In all calls, please quote incident reference MSUB/B9 of 27/11/14.