Three people are in hospital with injuries after a crash in Northland overnight.

A St John helicopter rushed to the scene in Ruakaka shortly before midnight and a crew treated the injured parties.

One person was critically injured in the crash, and two others had serious injuries.

One patient was airlifted to Auckland hospital and two others were flown to Whangarei Hospital.

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A police spokeswoman said just one vehicle was involved in the crash, which happened on Peter Snell Rd.

The vehicle had driven off the road.

It would be towed away.