A driver has died in a horror crash on the Kwinana Freeway in Nambeelup.
Police say the man, a woman and two young girls were travelling in a white Nissan X-Trail southbound when the car rolled several times before coming to rest on a steel barrier around 6.50pm on Sunday.
The driver, a 34-year-old man died at the scene, while the front passenger, a 27-year-old woman, suffered serious injuries and was airlifted to Royal Perth Hospital.
Two girls, aged five and six, were taken to Perth Children's Hospital with non life-threatening injuries.
Major Crash investigators are appealing for anyone who may have seen the crash to contact Crime Stoppers on 1800 333 000 or report online at crimestopperswa.com.au.
Any dash-cam or mobile phone vision relating to this crash can be uploaded via the following link: https://wapf.au.evidence.com/axon/citizen/public/fatalcrashnambeelup
Motorcycle passenger in critical condition after rider allegedly runs red light in East Rockingham
Two men charged over Australind murder
Last call for donations to support Mandurah's homeless
State Government commits to building $5 million electrical training facility at Rockingham TAFE
McDonald's approved for Dawesville
Wanted man known to frequent Kwinana, Mandurah and Rockingham areas
Mandurah woman completes grueling English Channel swim
Man and child seriously injured in South West crash
Motorists warned to expect delays during Kwinana Freeway upgrades