Police are still working to identify a woman whose body was discovered in a "horrendous scene" at Royal Park in Melbourne's inner north.
Homicide and other detectives are scouring a crime scene near the North Park Tennis Club where dog walkers discovered the woman near a collection of logs and trees just before 9.30am on Saturday.
"Unfortunately they've both come across this horrendous scene," Detective Inspector Andrew Stamper said.
Detectives say it's still very early in the investigation and they're in need of any piece of information the public can provide.
"Sadly at the moment we still don't know who this female is, we don't know the circumstances that brought her to the park or what happened," he said.
The park is one of Melbourne's busiest by day and used by rough sleepers at night, he said, and appealed for anyone who saw anything on Friday night or the early hours of Saturday to come forward.
"We really need the community's help with this."
A number of people have already come forward to assist.
He said police had no idea yet about the woman's age, cause of death or if they're looking for a particular weapon, but suggested the possibility it was a random attack would be a "strong focus".
Pathologists arrived in the afternoon, while SES crews are expected to join police for a line search. CCTV is also being collected.
"We're looking at absolutely everything at the moment. Everything will be in focus," he said.
A heavy police presence will continue in the park in the coming days, with mounted police and officers on bikes to patrol the area.
"This is an horrendous crime, as all murders are, and particularly the murders of women and we've got our best people (investigating)," Detective Inspector Stamper said.
"Our focus as always will be on catching the perpetrator of this horrendous crime and I give the community my assurance that we won't stop."
Assistant Commissioner Luke Cornelius said despite a number of random attacks on women in Melbourne in recent history, the city remains one of the safest in Australia and the world.
"This has come as an awful shock not only to the community but also to the local police here," he said.
"Women and men are absolutely entitled and should feel safe to go about their normal day-to-day activities."
Australian Associated Press