A motorcycle caught on fire on the Graham Farmer Freeway this morning after the rider failed to stop for police.
A police officer standing on the side of the road attempted to flag down the motorcycle near the Loftus Street exit about 11am because of the way they were riding.
The rider, who was carrying a passenger, failed to stop and a second officer, also standing on the side of the road, also attempted to flag the rider down.
The rider again failed to stop but lost control and crashed.
The motorcycle caught on fire, with thick smoke covering the area.
The crash blocked the right westbound lane just before the Loftus Street exit as emergency services attended the scene.
The rider and pillion passenger are understood to have received minor injuries in the accident.
Members of the public alerted police to a discarded backpack, which was allegedly thrown away by either the rider or pillion passenger.
The backpack has been recovered.
St John Ambulance took one person to Sir Charles Gairdner Hospital with minor injuries.