Southern Metro Region Crime Team detectives are investigating following a series of incidents across Melbourne's southern and western suburbs overnight.
Officers initially responded to reports of an aggravated burglary on Pasadena Crescent, Bentleigh East about 8.40pm last night (26 May).
It is understood four males, one armed with a knife, broke into the home, ransacking the premises and making demands of the occupants.
Three residents were home at the time, including a 39-year-old man and 32-year-old woman.
Both were assaulted during the incident and sustained minor injuries.
The males then fled with jewellery, computers and handbags, and also took the victims' black BMW.
Shortly after, the BMW was involved in a collision on the Westgate Freeway, where it crashed into a barrier.
As a car slowed down to render assistance, one of the occupants of the stolen vehicle exited and attempted to open the victim's door.
The 45-year-old man and his 39-year-old female passenger managed to drive away unharmed.
The stolen BMW from Bentleigh East was dumped in the vicinity of this location.
Police were then called to an address on Anderson Street, 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 males, one of whom produced 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 males, 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 this morning (27 May).
On this occasion, four masked males 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 offenders stole two further vehicles, a grey 2010 Mercedes sedan registration XOB358 and a black 2015 Honda HR-V registration 1EY3DI.
The stolen Hyundai from Port Melbourne was dumped in the vicinity of this location.
Both the Honda HRV and Mercedes remain outstanding.
Detectives are working to establish the exact circumstances surrounding the incidents, however they are believed to be linked.
The males involved are perceived as African in appearance and the investigation is ongoing.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au
