A woman was kicked unconscious during a rampage by a gang of youths in Melbourne's north-west on Saturday.
Police say the crime spree started in Mickleham just before 3am when three males got out of a dark blue car and approached a parked car in a Mount Ridley Road car park.
The trio tried to force their way into the car but were thwarted and drove away.
Police say about half-an-hour later, the same group approached a 22-year-old man who was starting a shift at a Woolworths supermarket in Craigieburn.
The victim, Nicolas Tonna, told 9 News that the men were armed with cricket bats and a knife.
"I was approached by about three to four African males, all dressed in black and face covered and everything, and all brandishing weapons asking for everything I have," he said.
They stole his wallet, phone and keys and drove off in his 1998 Holden Commodore sedan with registration PGJ 268.
Five minutes later, the stolen car pulled up alongside a group of teenagers who were walking along Aitken Boulevard on the way to Craigieburn North McDonald's.
Police say that a 40-year-old woman who was picking up her teenage daughter intervened and was hit in the head.
A witness, Alex Drnford, told 7 News that one of the males swung a bat at the woman's head but missed.
"Because she dodged it, the guy flung his foot up and kicked her in the head," he said.
The Craigieburn woman was taken to hospital with non-life threatening injuries.
The same group is then believed to have gone to a BP service station in Geelong Road, Brooklyn, about 5am.
Police say three males, armed with a wooden bats and knife, held up the store for cash and cigarettes before demanding that a man at the bowser hand over his car keys.
The man pleaded with the trio not to take his car and they left without stealing anything from him.
Police say they are looking for four males of African or Pacific Islander appearance.
The Commodore has not been recovered.
Any witnesses or anyone with information should call Crime Stoppers on 1800 333 000.