A three-car crash on State Highway One in the Horowhenua District has left six people injured and closed the road.
The crash occurred just south of Manakau about 6.55pm and police said three people were reportedly trapped in vehicles.
They've since said one person has serious injuries, and five others sustained moderate injuries.
The road is blocked and diversions are in place at Manakau and at South Manakau Road.
A helicopter has been dispatched to the scene.