Detectives at Whittlesea Crime Investigation Unit are investigating an armed robbery at a business in Thomastown on Tuesday night.
Three males entered the Trawalla Avenue premises armed with a shotgun and an iron bar just before 11pm.
One of the men stood as look out at the front door while the two other men entered reception and threatened a female staff member with the firearm.
The men ransacked the front counter then fled on foot with the cash register containing a small amount of cash.
The offenders were all wearing hooded tops and had their faces covered.
No shots were fired during the incident and no one was injured.