Four people trapped in their vehicle after a crash north of Auckland have now been freed and flown to hospital.
State Highway 1 at Dome Valley is now closed as the police serious crash unit investigates the smash, which happened north of Kraack Rd just after 11.30am today.
A St John spokesperson said two people were flown to Auckland City Hospital by the Auckland Westpac Rescue chopper and the Northland rescue helicopter; one in a critical condition, the other serious.
A third person had been taken by ambulance to Auckland City Hospital also with serious injuries.
The fourth person was treated for moderate injuries at the scene.