A man has died after his truck-and-trailer unit rolled at Beaumont, in the Clutha District.

The driver of the truck was trapped in the cab and died at the scene.

Police, two fire engines and ambulance were called to Rongahere Rd, about 3km south of Beaumont, at 6.22am. A section of Rongahere Rd is closed while a heavy crane removes the truck. Diversions are in place.

The police's Commercial Vehicle Safety Team and the Serious Crash Unit have been advised.

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No other vehicles were involved.