Police are trying to identify a smartly-dressed man in a three piece suit who allegedly attacked a group of friends in the City after they shouted “cheer up” to a passer-by.

The suspect, who seemingly thought the remark was directed at him, headbutted one man and punched his two friends in the face, according to police.

The group were walking to a bar along Fenchurch Street after a meal at around 10.15pm on Friday, October 3.

They were chatting to each other and one of them shouted “cheer up” to a passer-by who ignored the comment and walked on.

However, a man who was walking towards the group thought the remark was directed at him.

Police say he stopped and confronted the three friends on Fenchurch Street at the junction with Philpot Lane and threatened to ‘knock’ them out.

The suspect then headbutted one man and punched the other two in the face.

One of the men fell to the floor and suffered a number of cuts and bruises when he hit his head on the ground. The other two men were taken to hospital and treated for injuries to the jaw.

The suspect fled to Fenchurch Street Station and boarded a train.

Today City of London police released a series of CCTV images of the suspect and said they believe he works in the Square Mile and frequently travels to and from the station.

The suspect is described as white, medium build, in his late twenties, 6 foot tall with slicked back dark hair.

He was wearing a three piece grey suit with a white shirt, red tie and red socks.

Anyone with information is asked to call City of London police on 0207 601 2222 or ring Crimestoppers anonymously on 0800 555 111.