Police hunt two sex predators in Melbourne

The hunt is on for two sex predators who attacked three women in the same Melbourne suburb where Jill Meagher died.

Police say an assault on Friday night in Brunswick is not linked to two similar attacks a week earlier.

A 21-year-old woman was walking through a park at 8pm on Hope St in Brunswick West on Friday when grabbed from behind.

The assault continued until she called out to a passing cyclist and the attacker stopped and ran.

Detective Acting Senior Sergeant Michael Phyland said on Saturday police would like to speak to the cyclist and anyone else who might have seen the incident.

It came after another man grabbed two woman from behind and dragged them down side streets in Brunswick in the early hours of May 10.

Both were able to fight him off and escape.

Jill Meagher was raped and murdered after being snatched from a Brunswick street in 2012.

Sgt Phyland said men and women should be careful when walking at night in the suburb.

"Where you can, take well lit areas, be aware of your surroundings, take the safest path that you can," he told reporters.

Sgt Phyland said descriptions of the two men were different and the attacks were not linked.

The Friday night offender is described as Caucasian, with a medium to solid build, aged in his 30s, with dark hair, blood-shot eyes and a beard.

Police have released CCTV footage of the other man wanted for the May 10 attacks.