Two balaclava-clad men produced a shotgun during a Dandenong TattsLotto store robbery.
They entered the Hemmings Street shop about 6pm on Friday 24 June, Greater Dandenong CIU Detective Acting Sergeant Luke Shore said.
One approached the counter at the rear, produced a sawn-off shotgun and demanded cash from the 28-year-old attendant.
Det Acting Sgt Shore said there was no cash to hand over because the store was closed.
But the armed man continued his demands and pushed through the counter towards the victim, who then handed over his wallet.
A 42-year-old man then entered the store. The bandit pointed the gun at him before fleeing with his accomplice.
Det Acting Sgt Shore said they got into a vehicle parked opposite the shop, driven by a third person.
Call Crime Stoppers on 1800 333 000 with any information.
