POLICE are appealing for information after a man was violently assaulted on a Leeds to Skipton train at Keighley Station.

And officers from British Transport Police (BTP) have issued a CCTV image of someone they want to speak to in connection with the incident.

The 27-year-old victim had boarded the 9.26pm Northern Rail service at Leeds on Friday, December 23.

He got into conversation with three men sat opposite, but the friendly nature of the chat became hostile and at Keighley one of the men punched the victim several times to the head, knocking him to the floor.

The incident happened just after 10pm.

Investigating officer PC Katalin Kelei said: "It is baffling why this man decided he would launch such a violent and unprovoked assault, especially as the victim and him were having a friendly conversation just moments before.

"As you would imagine, this attack has left the victim incredibly shaken, however I am pleased to say he did not sustain any lasting injuries.

"If you have any information which would help us trace the person responsible, then please do get in touch as soon as possible."

Anybody able to assist can contact BTP by text on 61016 or by calling 0800 40 50 40, quoting reference 291 of 19/01/2017. Alternatively, contact Crimestoppers anonymously on 0800 555 111.