Two truck drivers were injured yesterday when their road trains collided.
It is believed that one of the trucks was carrying ammonium nitrate, which spilled from the vehicle, according to The West.
The crash occurred just south of Coolgardie on the Great Eastern Highway.
One of the drivers was later taken to hospital.
The area around the crash was closed until the trucks were removed and the ammonium nitrate cleared.
This is the second time in four months a truck carrying ammonium nitrate has rolled in Western Australia.
In the last incident around 200 kilograms of ammonium nitrate spilled across the road.