Two more teenagers have been arrested after an alleged crime spree over the weekend.
A 16-year-old and 17-year-old boy were taken into custody after the stolen Honda Jazz they were in was stopped by police on the Mitchell Freeway on Sunday night.
Police will allege the same Honda Jazz was involved in a series of robberies on Saturday night.
The 16-year-old boy from Maddington has been charged with stealing a motor vehicle, while the 17-year-old from Yangebup has been charged with aggravated robbery, stealing a motor vehicle, no authority to drive and stealing.
Both boys will appear in the Perth Children's court today.
Five other boys aged between 16 and 14 were taken into custody on Saturday night.
It is alleged the group of children stole the Honda Jazz and a bag after threatening a man in Burswood and another man in Northbridge.
They also allegedly robbed a woman in Northbridge and stole items from a service station in South Lake.
Some of the teens allegedly led police on a chase through several Perth suburbs in a stolen Honda Odyssey before they were arrested in Hamilton Hill with the help of the police helicopter and canine unit.