Port Phillip Crime Investigation Unit detectives are continuing to investigate after a man was assaulted and robbed at St Kilda Pier last week.
It is believed a man was approached by a group of at least eight people on the pier and an altercation occurred near Pier Road about 1pm on Thursday 18 December.
The man was assaulted and had his phone stolen, which was later thrown into the water by one of the offenders.
The victim, a 34-year-old on holiday from Norway, sustained a broken arm and was transported to hospital.
Despite intending to spend Christmas in Australia, he has since returned home.
The offenders fled the scene prior to police arrival.
Investigators have released images of three men and a woman they believe can assist with their enquiries.
The first man is described as being in his early 20s, of Mediterranean/Middle Eastern appearance, approximately 165cm tall with a thin build, short goatee beard and black curly hair.
He was wearing black shorts and sunglasses.
The second man is described as being in his early 20s, of Caucasian appearance, approximately 175cm tall with a medium build, short goatee beard and short brown hair.
He was wearing an open grey short sleeve shirt, blue camouflage shorts, a black New York Yankees beanie, black Nike runners and carrying a sports bag.
The third man is described as being in his late teens to early 20s, of Caucasian appearance, approximately 170cm tall with a thin build and curly hair with shaved sides.
He was wearing a Chicago Bulls #13 jersey, black Nike shorts, black Nike slides and carrying a black satchel bag.
The woman is described as being in her early 20s, of Caucasian appearance, approximately 160cm tall with a slim build and dark hair.
She has a number of distinctive tattoos on her chest, leg and arm and was wearing a red bikini.
It is believed there were a large number of bystanders at the time and investigators are keen to speak with anyone who witnessed the incident.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit an online confidential report at www.crimestoppersvic.com.au.
