Images have been released of a man detectives wish to question over a serious assault.

A 27-year-old man suffered a serious head injury during the attack, which happened at the top of Waverley Steps on Edinburgh's Princes Street on Thursday, December 10 at around 10pm.

The CCTV pictures show a man travelling on a train. He has a bald head and is wearing a smart jacket and scarf.

Detective constable Andy Cory said: “The man pictured is believed to be of significance to our investigation and anyone who can assist in tracing him is asked to come forward. Similarly we would ask the man to come forward himself and help with our investigation.”

Anyone who recognises the man in the images is asked to contact police immediately on 101, or alternatively Crimestoppers on 0800 555 111.