A man needed stitches after being glassed in a pub.
The 37-year-old victim, from Brighton, was attacked in the Bulldog Tavern in St James's Street, Kemp Town, Brighton, at about 2.20am on Friday.
He suffered severe cuts to his face and had to have stitches to his cheek and lip.
Detectives would like to speak to the two men and two women in these images who are believed to be key witnesses to what happened inside the pub.
A 24-year-old man was arrested on suspicion of assault and questioned before being released on bail while inquiries continue.
Detective Constable Chris Bishop said: "We would like to speak to anyone who was in the pub on Saturday and saw the attack happen or what happened in the minutes beforehand.
"Each of the four people who were recorded on CCTV in Dorset Gardens could have important information about what happened inside the pub and we would like to speak to them urgently."