Police are investigating an aggravated home invasion and car fire in Werribee on Sunday night.
It is understood six male offenders forced entry into a property on Powlett Street about 11.50pm on March 3.
Three occupants inside the house were threatened with weapons and one man was assaulted and sustained non-life threatening injuries.
He did not require hospital treatment.
The offenders are then believed to have set fire to a car parked outside the property before fleeing the scene in a vehicle.
Police are working to establish the exact circumstances of the incident and investigations are ongoing.
Anyone with information can contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au.