A young man has suffered serious injuries following a crash in Port Kennedy.
The 21-year-old was driving a Ford Focus hatch east along Grand Ocean Boulevard around 11pm on Sunday when it's understood he failed to negotiate a roundabout at the intersection of Tryall Avenue.
His vehicle then left the road and slammed into a tree, trapping him inside.
The Port Kennedy man had to be cut free from the wreckage before being flown to Royal Perth Hospital by the RAC rescue helicopter.
Anyone who witnessed the crash is asked to contact Crime Stoppers on 1800 333 000.