A witness to a fiery car crash in Tuakau has captured the horrific aftermath on video.

The car struck a power pole and caught alight on George St just after 1am today, a police spokesman said.

Two people were critically hurt in the crash and another two had serious injuries, St John Ambulance said. They were all taken to Middlemore Hospital.

One of the patients brought in from the crash was discharged today and three others were in a stable condition, a hospital spokeswoman said.

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One person was thrown from the car, a police spokeswoman said.

The crash downed powerlines.

The serious crash unit was investigating, the police spokeswoman said.