A motorcyclist has been killed in an accident on State Highway One north of Wellsford.

Police and emergency services are at the scene of the crash, about three kilometers north of Te Hana.

No other vehicle was involved in the incident.

Police said the motorcycle sustained "extensive damage" and the rider - who has yet to be identified - was found dead nearby.

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Both lanes of the highway are still open, although police warn that traffic has been slowed right down.

The Serious Crash Unit is investigating the cause of the crash and police are working to identify the rider.

- HERALD ONLINE