MEN armed with a hammer, crow bar and knife have robbed a Keysborough 7-Eleven.
Greater Dandenong CIU Detective Sergeant Luke Kirton said the incident occurred just after 11pm on Saturday 12 December.
Three men wearing black hoodies and covering their faces with bandanas entered the Cheltenham Road store.
One jumped the counter with a knife in his hand, threatened the 45-year-old Hampton Park man behind it and demanded he open the till.
He stole the contents of the till plus a tray of cigarettes and the group fled.
Police including the canine unit attended but were unable to track the thieves.
Embona Taskforce is investigating. Det Sgt Kirton urged anyone with information to call Crime Stoppers on 1800 333 000.