A man was robbed and his neck sliced with a broken bottle after his attackers lured him down a twitten in The Lanes.
The 21-year-old was approached by a gang in Middle Street at 3.15am in the early hours of Saturday morning.
He went down the twitten which runs to Ship Street to speak to them, where they attacked him, one man taking his wallet and the other attacking him with a broken bottle.
He was treated at the Royal Sussex County Hospital in Brighton for a cut to the side of his neck.
Police today launched an appeal for witnesses. Detective Sergeant Dee Wells said: “We are very keen to trace these four men. This was an unprovoked and vicious attack which could have had a much more serious outcome.
“The men may have been in the area approaching other members of public prior to the incident and they were last seen running towards Ship Street. If you recognise these men or have any information please contact police.”
The suspects are described as three black men and one white man, with southern accents and in their late teens or early twenties. One of the black men was wearing a green bucket hat and another was wearing a baseball cap.
Anyone who witnessed the incident is asked to email email@example.com or call 101 quoting serial 205 of 23/08. Alternatively, call the independent charity Crimestoppers anonymously on 0800 555 111.