Police are appealing for public assistance following an armed robbery at a convenience store in Port Melbourne last Friday.

Investigators have been told a man entered the Bay Street store brandishing a box cutter around 8.20pm, demanding cash.

The bandit fled with an amount of cash south east down Raglan Street.

Prahran Embona Armed Robbery Taskforce detectives have releasec images of a man who they believe may be able to assist with their investigation.

The man is described as being Caucasian, in his early 20s, approximately 170cm tall, medium build with dark coloured hair and neatly trimmed side burns.

He was wearing a white zip-up hooded jacket, grey track suit pants, a baseball cap with a black and red tartan peak and orange boots with a clear sole.