A motorcyclist has been killed in crash which also involved four cars on State Highway One north of Auckland tonight.

Auckland Inspector Willie Taylor said emergency services attended a fatal accident between four cars and motorbike near Satellite Station Road, south of Warkworth around 9.15pm.

The rider died at the scene.

The driver of one of the cars was taken to North Shore Hospital with moderate injuries. No one else was injured.

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State Highway 1 was closed at the scene and traffic diversions were put in place.

Police said northbound traffic was being diverted off State Highway One at Silverdale and being routed via Dairy Flat Highway and State Highway 16.

Southbound traffic was being diverted via Woodcocks Road.