One person has died following a two-car crash on State Highway One south of Warkworth, north Auckland.
The crash was reported to police around 1.40pm. Police say one person was killed in the incident and another has been transported to hospital in critical condition.
St John confirmed five ambulances and a rescue helicopter were dispatched to the scene.
A section of State Highway One, south of the Warkworth township, was closed for most of the afternoon but has since reopened.
The Serious Crash Unit has been notified and will be examining the scene.
Police are advising motorists to plan ahead and expect delays on their journeys.