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.
'Prognosis terrifying' for young boy struck by car in Cooloongup
K9 Rescue's long-term resident in desperate search for loving home
West Coast Radio announcer Darragh O’Dea takes out Best Local Show at Australian Audio Awards
Lucky escape for two people after boat smashes into Mandurah Estuary Bridge
Secret Harbour Golf Links to host WA's most prestigious golf tournament
Upgrades begin on Kwinana Loop Trail
Shire of Harvey councillors vote in favour of city status
Erskine syndicate shares in division one Lotto win
Man accused of chasing down boy in Greenfields car park before assaulting him and stealing bicycle