A serious crash has closed the South Western Highway, east of Bunbury.
The crash between a car and a truck happened near the intersection of Wireless Road in Waterloo around 10.30am on Monday.
St John Ambulance and firefighters are on the scene.
There are unknown injuries at this stage.
Motorists have been advised to seek alternative routes.
Detours are in place.
More to come...
South Western Hwy CLOSED IN BOTH DIRECTIONS from Willinge Dr to Raymond Rd, Waterloo due to a crash https://t.co/KZXg66AKIN #waroads
— Main Roads WA (@WA_Roads) September 9, 2019