Police are appealing for public assistance after several men were assaulted in separate unprovoked attacks in St Kilda earlier this year.
Detectives understand the first incident occurred on The Esplanade at about 8.30pm on Saturday 12 February.
It is believed the unknown offender attacked two men by punching one of the male victims to the face several times before then punching the second male victim and kicking him in the chest.
Detectives believe the same offender attacked another male on Acland Street around 11pm by punching him to the ground before kicking him in the face.
All victims, each aged in their 50s, received various injuries and were treated by paramedics at the scene.
The offender is perceived to be Southern European in appearance with short dark hair and a large tattoo on his left outer calf.
He was wearing a white t-shirt with a dark pattern across the chest, black shorts and white Nike shoes.
Anyone who witnessed the incident or has information is urged to contact police.