A teenager had his jaw broken after being attacked while out with friends.
The 18-year-old man was assaulted close to Costa Coffee in Wellington Place, Hastings, on Sunday June 8 at 12.20am.
He suffered a fractured jaw which required an operation.
There are believed to be two suspects – the first described as a white man, aged late teens, of proportionate build and with short, dark hair. He was wearing tracksuit bottoms, hooded top with a white hood.
The second suspect is described as a white man, aged late teens, of thin build. He was wearing a light top with a shoulder bag.
Detective Sergeant Tony Webb said: "The victim was trying to prevent his friend from being assaulted by a man who was determined to get to his friend and punch him."
A 15-year-old boy has been arrested on suspicion of assault, questioned and released on bail until July 22.
Any witness or anyone with information is asked to call 101 or email firstname.lastname@example.org quoting serial 33 of 8/6. Alternatively, call the independent charity Crimestoppers anonymously on 0800 555 111.