Police are seeking public information on a crash in Karratha which left a motorcyclist seriously injured.
The 28-year-old man was riding his bike north along Nickol Road around 5.55pm on Monday when he collided with a Ford Fiesta being driven by a 21-year-old woman.
The force of the impact threw the man 10 metres from his bike. He was airlifted to Royal Perth Hospital and remains in a critical condition.
The woman received minor injuries and was treated at Karratha Hospital.
Anyone who witnessed the crash, or saw the vehicles involved beforehand, should phone Crime Stoppers on 1800 333 000.