Four teenagers have been arrested after an alleged brazen daylight attack on the streets of Melbourne.

Reports of a fight and several males “hanging out of a white Haval” on Lalor St in Port Melbourne were made to police about 3.15pm on Monday.

Footage of the incident showed two men walking along the street before they were allegedly set upon by the group.

One man in high-vis tripped and fell while trying to escape, having to curl up into the fetal position to protect himself from a flurry of blows.

The footage shows him being struck with a metal bar, punched and kicked in the head while screaming for “help”.

Passers-by then yelled at the group, moments before they returned to the car and fled — leaving their target behind.

Police arrived soon after and didn’t find the victim or the attackers.

Investigators believe the car was stolen from outside a gym in Clyde North, southeast Melbourne, on Saturday.

The car was later spotted by officers on the Westgate Fwy about 12.20am on Wednesday.

A police helicopter tracked the car to a carpark on Shepparson Ave in Carnegie, where one teenager got out and was arrested soon after.

Officers from the Critical Incident Response Team then boxed the vehicle in and arrested three others in the vehicle.

“A search of the vehicle uncovered several hatchets, a sledgehammer and a steel pole,” police allege.

Detectives are now expected to interview the teenagers, two 16-year-old boys from Merri-bek and Dandenong, a 16-year-old girl from Melton and a 14-year-old boy from Melton.

Charges have not been laid.