Four people have been injured, two critically, in a crash on Auckland's Southwestern Motorway overnight.
Police said a car hit the centre barrier on State Highway 20 at 12.40am.
The car's four occupants were all taken to hospital. Two are in critical condition, one is serious while the other has minor injuries.
The motorway was closed at Onehunga but has since reopened.
An investigation is underway into the cause of the crash.
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