Police have launched an appeal after a man was attacked and robbed on a train.

The 22-year-old victim was travelling on the 5.33am London Waterloo to Putney service on April 13.

He was sitting in the front carriage when a man approached him and punched him on the left side of his face.

The man stole a Blackberry phone worth £300 during the assault, as well as a wallet containing ID, credit cards and cash.

It is believed the suspect left the train at Putney and went to McDonalds, using the stolen credit card to buy food.

He travelled on to another McDonalds in Fulham, using the card again.

The victim was left with a broken cheekbone, bruising and swelling to his face.

Police have released two images of a man they believe was on the train when the attack took place and are urging for anyone who recognises him to call police.

Detective Constable Gary Bellinger said: "This was an unprovoked, nasty attack on a member of the public simply trying to make his way home.

"While violent robberies of this nature are very rare on the rail network, British Transport Police (BTP) treat them with the utmost seriousness where they do occur, and we are using every available resource to identify the perpetrator and bring him to justice.

"These are very clear stills of a man we believe will have information about this offence, and it is imperative that he, or anyone who knows him, gets in touch."

Anyone with information can call British Transport Police on 0800 40 50 40 or by texting 61016.

Alternatively call Crimestoppers anonymously on 0800 555 111,  quoting log B7/LSA of 03/05/13.