Knox police are investigating an attempted armed robbery at a Wantirna milk bar on 27 June.

Detectives believe a man entered the Crestdale Road milk bar at 7.30 pm armed with an imitation firearm.

He made a demand for cash before being chased from the store by the attendant.

The offender is described as Caucasian, between 15 and 18-years-old, approximately 170 centimetres tall, with a slim build.

He was wearing a distinctive patterned top, tracksuit pants, and dark shoes.

Police have released three images of a man they believe can assist with their enquiries.

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