A serial sex attacker who stalks women in Melbourne has struck again, police believe.
The man, linked to two previous attacks, is now believed to be behind another serious assault and the stalking of three women.
In the most recent attack, he grabbed a 22-year-old woman from behind early Saturday morning and forced her into a secluded city stairwell, where she was sexually assaulted for 20 minutes.
Police believe the same man stalked another three young women in the area earlier that morning.
He followed them into the female toilets at Southern Cross Station, but the women locked themselves in cubicles and threatened to call triple zero, scaring him off.
Detective Inspector Paul Binyon says police want to catch the man quickly before another woman gets hurt.
"This offender is behaving like a predator," he told reporters on Tuesday.
"There's no doubt that the offences he's committed here are terrible and we need to stop this man."
The man began attacking women while riding a skateboard but he was on foot in the latest attack and was carrying an edged weapon.
Police have also spotted the man on CCTV footage in the city heart appearing to be scouring bars and nightclubs.
In December, he attacked a 24-year-old woman by dragging her onto the ground at a car dealership before stealing her credit card.
The same man also approached a 22-year-old woman waking in the CBD on November 9 and forced her into a laneway or shop alcove where she was indecently assaulted.
The man is described as Asian or South American in appearance, aged in his late teens to mid-20s, with a slim build and about 165 centimetres tall.
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