Three people were seriously injured, one seriously, in a crash near Kumeu last night.

The single-car crash occurred on State Highway 16 just south of the township north of Auckland shortly before midnight, a Fire Service spokesman said.

One person was trapped in the vehicle and had to be freed by emergency services.

A St John Ambulance spokeswoman said one person suffered serious injures and two others moderate injuries.

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They were being treated at the scene and would be transported to North Shore Hospital, she said.