A worker has been threatened with a screwdriver during a robbery at a Ludmilla service station.
Police received reports that four boys caused damage within the Bagot Road servo at 11pm on Sunday.
One of the boys is further accused of assaulting the male employee, cutting him on the wrist with the screwdriver.
Fortunately, the worker escaped with only minor injuries while the group fled the scene.
Three youths aged 12, 13 and 15 were arrested yesterday and have since been charged with two counts of aggravated robbery and one count each of aggravated assault and theft.
Another 13-year-old boy was referred to the Department of Territory Families, Housing and Communities.