Major Crash Investigators are seeking witnesses to a crash in Ballajura yesterday.
A green Ford or similar vehicle was being driven on Illawarra Crescent near Shearwater Terrace between 2.45 and 3.05pm.
A 16-year-old male suffered serious injuries in the crash.
Police would like to hear from anyone who was travelling on Illawarra Crescent at the time who may have observed the incident or vehicle.
Anyone with information is asked to call Crime Stoppers on 1800 333 000.