One person has died after a truck reportedly rolled and caught fire on State Highway 1 south of Bombay Hill.
The crash was reported to emergency services about 11.40am and occurred near the Beaver Rd off-ramp.
It is understood the truck was travelling southbound.
SH1 is closed in both directions between Mill Rd and Nikau Rd, and is expected to remain closed until early this evening, police say.
Southbound lanes are expected to be closed for longer as the Serious Crash Unit examines the scene.
Southbound traffic is being diverted at the Bombay Hills, while northbound traffic is being diverted at Pōkeno.
Motorists are advised to expect delays.
According to a 1News cameraman, back roads around the crash were "gridlocked" as of 1.45pm.
The truck reportedly rolled and caught fire on State Highway 1, south of Bombay Hill. (Source: Other)
St John Ambulance said an additional patient in a moderate condition was airlifed to Middlemore Hospital.
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