CCTV footage has been released after a teenage boy was punched on a train travelling from Cardiff.
The incident happened at 8.50pm on Saturday, November 23 on a service from Cardiff to Ebbw Vale.
The boy was punched before the train arrived at Pye Corner station in Newport.
British Transport Police said all parties were then separated by passengers and guards on the train. The victim was uninjured.
Officers investigating have released a photo of a man they want to speak to in connection with the attack.
Before the attack, the victim was at platform 0 at Cardiff Central station with a friend. Police said the man was reported to have walked past and "slapped the phone out of the friend's hand".
Anyone who knows the man in the photo is asked to contact BTP by texting 61016 or by calling 0800 40 50 40 quoting reference number 1900101317. Alternatively, call Crimestoppers anonymously on 0800 555 111.
