Mitchell Crime Investigation Unit detectives are investigating an armed robbery in at a Wallan service station on Tuesday.
Investigators have been told a man armed with a knife entered the High Street premises shortly before 4.50am
The man threatened and made demands to the employee before fleeing with an amount of cash in a black Mercedes Benz.
No one was injured as a result of the incident.
Investigators have released a number of CCTV images of the vehicle and a man who they believe may be able to assist with their enquiries.