A group of friends suffered broken bones after being attacked by a gang of men.
The five friends - three men and two women – were attacked from behind by a group of about 15 people in Kings Road, Brighton, at about 2.30am on Tuesday January 21.
Three of the victims, who were all aged 19 to 20, suffered serious injuries including a fractured eye socket, a broken nose, a broken tooth and cuts and bruises.
The fight was stopped by another group of people who came to the victims' aid.
Detective Constable Leon Ryan said: "This appears to be an unprovoked, random attack on a group of friends just trying to make their way home.
"The offenders were all boys and men aged from their mid-teens to their early twenties.
"We need to speak to anyone who saw or heard the attack taking place or who has any information about what happened. The victims have suffered very nasty injuries and we are keen to track down their attackers."
Anyone with information should call 101 quoting serial 114 of 21/1, email email@example.com or call the independent charity Crimestoppers anonymously on 0800 555111.