Two more teenagers have been arrested in connection with the fatal hijacking of Magda van Vuuren, 53, in Adcockvale on Monday afternoon.
The two – aged 15 and 16 – were arrested at Westview School in Newton Park on Tuesday afternoon.
Van Vuuren died after she was shot when a group of youngsters allegedly hijacked her in Diaz Road on Monday afternoon.
Two suspects – a 16-year-old boy and a 15-year-old girl – were arrested at the Engen garage in Bluewater Bay on Monday night when an off-duty police officer spotted the hijacked BMW at about 8pm.
The third suspect, also a 16-year-old boy, was arrested early on Tuesday morning at his Zwide home.
According to eyewitnesses, the suspects were wearing the Westview School uniform.
The five are expected to appear in Nerina House Juvenile Court for hijacking, murder, illegal possession of firearm and for being possession of the stolen BMW on Thursday.