Emergency services are responding to a crash on the Forrest Highway in West Coolup.
The crash happened around 7.45am on Saturday between Heron Point Road and Old Bunbury Road.
It is understood a car and a bus collided.
It is not yet known if anyone was injured.
Motorists travelling on Forrest Highway in the West Coolup and Birchmont areas have been advised to drive with caution as there is reports of thick smoke.
The Forrest Highway has since reopened.
Tragic update in search for missing man Robert Snyder
Premier Roger Cook to leave Kwinana electorate, move to Perth
Mandurah Marine Rescue's new vessel named in memory of nun who survived 1959 boating accident
Teen dies in motorbike crash at Waroona Dam
Shark alert issued after whale carcass reported at Preston Beach
Kwinana businesses to refuse serving students during school hours
Men attacked, campervan windows smashed in East Rockingham
Entries for 2026 Castaways Sculpture Awards now open
Meadow Springs man pleads guilty to threatening to kill PM and NSW Premier