State Highway 1 near Ōtaki north of Wellington is closed following a crash involving four vehicles.
The crash occurred at around 6am just north of Ōtaki.
Four people have been injured. Three were taken to Palmerston North Hospital - one in a moderate condition and two in a serious condition.
The other person was airlifted to Wellington Hospital in a critical condition.
Diversions are in place, motorists are advised to avoid the area and expect delays.
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