Police are investigating an aggravated robbery at the BP service station on Churchill Road, Kilburn overnight.
Just after 1am, a man allegedly armed with a knife threatened staff and stole cash from the till.
He fled on foot and was last seen on Northcote Street.
The offender is described as Aboriginal and wearing a black hooded jumper, a royal blue beanie with green and white stripes, light coloured tracksuit pants, white sneakers and a white towel over his face.