The women were airlifted to hospital following the traffic crash.
Police are investigating a traffic crash that occurred in Beedelup, in the states south, yesterday afternoon.
Around 2.35pm, two campervans were travelling in a north-west direction along the Vasse Highway when a Mitsubishi Challenger station wagon travelling behind them, attempted to overtake both campervans.
The Challenger successfully overtook the first campervan but the second campervan that was in the lead of the three vehicles had commenced a right hand turn and the Challenger collided with this campervan.
The occupants of the Challenger were four women from Denmark, currently visiting WA. The driver and front passenger, both 26-years-old, received serious injuries and were rushed to Pemberton Hospital before being airlifted to Royal Perth Hospital.
The other two female occupants aged 24 and 21, received minor injuries and were taken to Pemberton Hospital before being transferred to Bunbury Hospital.
The occupants of the Campervan were not injured.
Police would like to speak to anyone who saw the crash or anyone who saw the campervans or Mitsubishi Challenger prior to the crash.
Police issue 31,000 driving infringements in first month of new AI cameras
Works underway on Rockingham and Safety Bay High School redevelopments
New measles exposure sites revealed in Bunbury
Dawesville man charged after allegedly leaving his elderly Great Dane to suffer painful conditions
Good Samaritan sought by police after helping teen during robbery in Baldivis
Under-16s social media ban now in force
Desperate search continues for missing Bunbury FIFO worker
Passengers now able to use credit, debit cards to tag on and off WA's public transport
New floating jetty speeds up emergency response times for Marine Rescue Mandurah