Police are investigating an armed robbery at a service station in Pascoe Vale last Friday.
Police were called to the premises at 281 Gaffney Street after a man smashed his way into a temporary portable office and threatened the attendant just before 2am on Friday, 5 April.
The offender gained entry by smashing the locked glass door with a metal pole.
Once inside, the offender threatened the console operator with a knife and demanded cash.
He was given a small amount of money before running from the scene.
The man is described as Caucasian, approximately 183cm tall with a solid build.
He was wearing a blue jumper with a red stripe and dark track suit pants.
He had a dark jumper wrapped around his head.
Police have released an image of a man who was in the office approximately 15 minutes prior to the robbery who may be able to assist with enquiries.