Wellington police are appealing for witnesses after a crash on the Kapiti Coast that has left two people seriously injured.

Two cars collided on Old State Highway 1 in Raumati South just before 8am.

Two people are being treated at Wellington Hospital, including one who is in intensive care.

Officers would especially like to hear from the driver of a truck who narrowly avoided a collision with a silver Volkswagen Golf on Old State Highway 1 shortly before the incident.

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The Serious Crash Unit is investigating.

Diversions are in still in place.