One person is dead and another is fighting for their life after a taxi and car collided in West Auckland.

Police say the crash happened on the Royal Rd overbridge at about 3.45 this morning.

One person was taken to hospital in a critical condition and the taxi driver, was treated at the scene for minor injuries.

A police spokesman says the bridge is closed and the Serious Crash Unit is investigating.

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He says the next-of-kin haven't yet been told.