Police investigating the armed robbery of a Dinmore service station on Sunday night have released images of a man who may be able to assist with their investigations into the incident.

Around 9pm a man has entered the store and threatened a female staff member with a knife, demanding money.

The staff member has complied and the man fled on foot with a sum of cash.

The man (pictured) is described as Caucasian in appearance, about 177cm high and with a medium build.

It is believed the man may have left the area in a car (pictured).

Police are appealing for anyone who may be able to identify the man or who has any information in relation to the matter to contact Crime Stoppers on 1800 333 000.