Detectives from Altona North Embona Armed Robbery Taskforce are hoping to identify a man with a distinctive manner of walking following an armed robbery in Hoppers Crossing last month.
Investigators have been told the man attended a bottle shop at a Geelong Road shopping centre about 6.50pm on 6 March.
The unknown man selected a can of alcohol before walking to the counter.
He lowered his pants to reveal a knife to the attendant and demanded cash.
The man fled the store with a sum of cash before fleeing the centre on a black bicycle in an unknown direction.
Police have released images and CCTV footage and images of a man they believe may be able to assist them with their enquiries.
He is perceived to be Caucasian in appearance, between 30 and 40-years-old, about 188cm tall with an average build, and had a distinctive walking style.