The rescue helicopter has been sent to a serious crash south of Pinjarra.
It's understood two cars collided on the Forrest Highway northbound at the intersection of Hill Road in West Coolup around 7.30am on Monday.
One of the cars has ended up on its roof.
Motorists should avoid the area.
More to come...
Hayden Ballantyne signs with Rockingham Rams
A former Fremantle star will suit up for the Rockingham Rams Football Club this year.
Mayor reassures community that 'no decision has been made' to close 4WD access at Tim's Thicket, White Hills beaches
Mayor Amber Kearns has reassured the community that no decision has been made to close four-wheel-drive access to Tim's Thicket and White Hills beaches.
DBCA 'sick and tired' of illegal access to Port Kennedy Scientific Park
The Department of Biodiversity, Conservation and Attractions (DBCA) say they are "sick and tired" of people illegally accessing the Port Kennedy Scientific Park and are calling on locals to dob them in.
Mandurah homeless camp goes up in flames
A homeless camp in Mandurah has gone up in flames.
Dawesville community shocked after kangaroo deliberately mowed down
Dawesville residents have been left shocked after CCTV emerged of a driver appearing to deliberately run down a kangaroo and her joey.
Teens armed with knife, scooter charged over Rockingham Shopping Centre fight
Three teenagers have been charged over an alleged fight with another group of youths at Rockingham Shopping Centre.
Mandurah private school teacher charged with alleged sexual abuse of male student
A Mandurah private school teacher has been charged with the alleged sexual abuse of a male student.
Welfare concerns for missing Ravenswood girl
Pinjarra Police are still urgently seeking the public's help to find a missing 14-year-old girl.
Detectives investigate Rockingham aggravated robbery
Detectives are asking for the public's help as they investigate an aggravated robbery in Rockingham.