A camera operator has been assaulted while reporting on an armed burglary at a home in Melbourne's west.

The assault took place on Monday outside a Melton South property that was burgled last month, with police calling the attack "unacceptable".

Detectives investigating last month's robbery were told four men forced their way into the property about 4am on April 24.

The thieves, who were wearing balaclavas and masks, fired gunshots and made demands for a safe, drugs and cash.

When the three residents said there were no drugs or cash inside, they were assaulted.

The bandits subsequently found a safe and stole jewellery before taking a Volkswagen Polo and fleeing. The car was later found burnt out on the North Shore.

A 31-year-old man was treated for a significant knife wound to his face, while a 44-year-old woman and a 67-year-old woman had minor injuries.

Investigators believe it was a targeted attack, with the victims known to police.

The group of offenders also used a white Mazda CX-5 with a sticker on the back windscreen during the attack.

Police have appealed for anyone who saw the incident or who has CCTV footage of it to come forward.

Detective Superintendent Jason Kelly also urged two men to hand themselves in to police after a camera operator was assaulted on a nature strip outside the property on Monday morning.

Police believe they know who the two men involved in the assault were, he said.

"The media have a role in our society to report on matters and it's concerning that people go to work and end up being the victims of assaults, as occurred this morning out there at Melton," Det Supt Kelly said.

"It's unacceptable and Victoria Police will pursue it and our investigations are ongoing at this stage."

The camera operator sustained serious facial injuries in the attack, while the offenders also threw rocks at the victim and reporters, Det Supt Kelly said.

7 News played footage of the assault on Monday evening, with a man appearing to punch the camera operator who was working for the broadcaster.

Earlier, a hooded man approached the camera. Journalists told the men to stop throughout the incident.

It was very rare that offenders fired shots into a victim's home, Det Supt Kelly said of the burglary.

Police did not believe the incident was linked to gang activity.