A man has died after a dirt bike and boat collided in Pinjarra on Thursday.
St John Ambulance and police were called to Fields Street, near Phillips Road, after reports a motorbike had crashed into a boat being towed by a Toyota Hilux about 5:15pm.
Paramedics arrived but were unable to save the rider.
Police have closed Fields Street in both directions as Major Crash Detectives work to piece together exactly what happened.
Anyone with any information, CCTV or dashcam vision is urged to contact Crime Stoppers on 1800 333 000.