A two car crash on Pinjarra Road in Ravenswood has left a woman with serious injuries.
The woman aged in her 30s was a passenger in one of the vehicles involved in the collision.
It happened just before 9am on Monday in the eastbound lanes of Pinjarra Road near the intersection of Nancarrow Way.
A St John Ambulance spokesperson said one person was trapped.
The road was blocked off in both directions to allow the RAC Rescue Helicopter to land.
The emergency rescue helicopter was no longer required and the injured woman was transported to Royal Perth Hospital.
The two male drivers - one aged in his 50s and the other in his 70s - were assessed at the scene before being taken to Peel Health Campus with minor injuries.