Four people have been taken to hospital following a three car crash at the intersection of Australind Bypass and Paris Road, Australind.
Emergency services including the RAC chopper arrived at the crash scene about 2pm and two people were cut from vehicles.
There was one adult and one child in each of the cars.
Two children and one woman were taken to Bunbury Hospital while one woman was flown to hospital in Perth.
Australind Bypass north bound and Paris Road heading towards the bypass are now blocked.