Brimbank Crime Investigation Unit detectives are investigating following an aggravated burglary in Keilor last month.
Investigators have been told three unknown offenders, two of which were brandishing firearms, attended the Ailsa Street residence about 8.30pm on 7 June.
The men gained entry to the garage before breaking into the house and stealing a number of items including power tools, documents, and jewellery.
Detectives believe the offenders utilised two vehicles, possibly a green Holden SV6 sedan and a dark grey Holden SV6 station wagon, which were seen shortly after the incident travelling along Arabin Street.
Investigators have released CCTV of three men, and their vehicles, who they believe may be able to assist with their enquiries.
The first offender had a slim build, and was wearing a light coloured long sleeve shirt, light pants, a baseball cap with dark sticker on peak, and a face covering.
The second was perceived to be Caucasian in appearance with a heavy build; he was wearing a black hoodie with a light jacket and light pants.
Offender three was perceived to be either Caucasian or Pacific Islander in appearance with a heavy build, and was wearing a light colour jumper and pants, light colour scarf over his head, and a surgical mask covering face.
The occupants were not home at the time of the incident.
Anyone with information or who recognises the men or the vehicles is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au