Police are appealing for public assistance following an armed robbery in Werribee South last Monday.
It is understood the offender, armed with a tire iron, entered a general store on Duncans Road about 2pm on April 15 and demanded cash from the shop keeper.
Officers have been told the 63-year-old shop keeper declined and chased the man out of his store.
The offender fled empty-handed and was last seen travelling in a white Toyota Camry with no registration plates.
No one was injured.
Detectives have released CCTV footage of a man who they believe may assist with their inquiries.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au