An armed gang is on the run after terrorising Melbourne last night with two home invasions and a carjacking.

Four men of African appearance broke into a home in Bentleigh East, Melbourne at around 8.40pm on Sunday.

They stole valuables and drove off in the victims' car but crashed it on the freeway.

The men then carjacked another and broke into a second home where they stole two more luxury cars and terrified the residents.

An armed gang is on the run after terrorising Melbourne last night with two home invasions and a carjacking

During the first break in, one of the gang was armed with a knife and threatened the owners, a 39-year-old man and 32-year-old woman.

The couple were both assaulted and left with minor injuries.

The men then fled with jewellery, computers and handbags, and also took the victims' black BMW.

The gang crashed the car on the Westgate Freeway by driving it into a barrier.

As a car slowed down to help, one of the gang got out and tried to open the door.

The 45-year-old man and his female passenger, 39, managed to drive away unharmed.

Timeline of terror 8.40pm: Men break into a home in Bentleigh East 9pm: Men carjack woman in Port Melbourne 12am: Men break into home in Derrimut and steal two cars Advertisement

The stolen BMW was later found dumped nearby.

Police were then called to a house in Port Melbourne just after 9pm after reports of an aggravated carjacking.

It is understood a woman was about to put her child into the car when she was approached by three men.

One pulled out a knife and demanded her vehicle.

The victim, a 42-year-old Box Hill North woman, called for help and was assisted by a family member, a 40-year-old man also from Box Hill North.

He was also threatened by the gang, who took off in their vehicle, described as a black 2012 Hyundai i30 with registration ZEX859.

The victims were not injured.

Police later responded to an aggravated burglary in Derrimut about 12.10am on Monday.

Four men of African appearance broke into a home in Bentleigh East, Melbourne at around 8.40pm on Sunday

On this occasion, four masked men armed with knives broke into a home on Ivy Close and were confronted by the occupants.

A 65-year-old man was assaulted during the incident and sustained a minor laceration. He did not require hospital treatment.

A 58-year-old woman, 91-year-old man and 64-year-old woman, who were also home at the time, were not injured.

The gang stole two cars, a grey 2010 Mercedes sedan registration XOB358 and a black 2015 Honda HR-V registration 1EY3DI.

The stolen Hyundai from Port Melbourne was dumped nearby.

Both the Honda HRV and Mercedes remain outstanding.

Detectives believed the incidents were linked. The investigation is ongoing. Anyone with information is urged to contact Crime Stoppers.