A violent brawl has been captured on camera at Melbourne’s Chadstone Shopping Centre, as five young men punched, kicked and spat on a security guard as he tried to stop a suspected thief.

Video taken from inside the JB Hi-Fi store last night showed the moment the security guard confronted a suspected thief after seeing him allegedly place a product inside his bum-bag.

The confrontation quickly turned into a brawl, with the guard punched in the face and kicked.

Violent brawl captured on camera at Melbourne's Chadstone Shopping Centre. (9NEWS)

The fight spilled into a corner of the store as staff came to the man’s aid.

Staff were able to eventually stop one of the attackers.

The violent attack happened just before closing time last night.

Two of the young men carried bottles of Jim Beam whisky, while others shouted threats at staff.

One witness said one of the men had been threatening he had a firearm.

The five men are still on the run. (9NEWS)

“He was threatening to bring in a gun, or had a gun, threatening to kill him or come back and kill him,” witness Kyra told 9NEWS.

“It kind of seemed like a scene out of a movie,” another witness Kieran Gill said.

JB Hi-Fi CEO Richard Murray said he was sickened by the attack.

"Our staff and security personnel just come to work and nobody deserves to be attacked when they are just trying to do their job. The safety of our customers, staff and security is always our number one concern,” he said.

Police investigations continue and the men, believed to be aged between 18 and 25, are still on the run.