A 19-year-old man was shot in Byford overnight.
Local police and officers from the Gang Crime Squad are investigating.
Around 10pm last night police were called to a house in Plaistowe Boulevard in relation to several shots being fired.
A group of people were outside a residence when its believed a vehicle drove past them, and an occupant of the car fired a weapon several times.
One of the shots hit a 19-year-old man in the leg.
Police attended the scene and the man was taken to Royal Perth Hospital by ambulance.
He has since left the hospital at his own risk.
Anyone with information regarding the incident is urged to contact Crime Stoppers on 1800 333 000 or make an online report.
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