A man has been critically injured this evening when his van crashed into a tree north west of Auckland.

The crash happened on Muriwai Rd around 8.30pm. A Westpac rescue helicopter was sent to the crash. Auckland Westpac Rescue Helicopter Trust spokesman Lincoln Davies said the man, in his 40s, was trapped for about an hour.

He was flown to Auckland City Hospital in a critical condition, Davies said.

St John reported one patient was critically injured.

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Three other vehicles attended the incident and treated the patient.

An ambulance was still on scene.

Police will soon close nearby Hamilton Rd, a police spokesperson said.

More to come.