The cause of a fire which engulfed a truck near Taupo yesterday morning is being investigated.

Emergency services were called to the blaze on State Highway 1, 3km south of Waitahanui, at 10.33am.

The road was closed for about two hours.

A New Zealand Fire Service shift manager said the truck was carrying mixed goods, "including a lot of paper". The fire was "well involved" when fire crews arrived, he said. Four fire trucks and two water tankers from Taupo Fire Station attended the incident.

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There had been concern about nearby vegetation also catching fire while the blaze was being battled.

Senior Sergeant Fane Troy said they did not know what caused the fire but the truck driver got out safely and no one was hurt.

While the blaze was being fought, he said: "It's still pretty hot in there, we still need to clean down the road and dampen things down, so I'm not too sure how much longer the road will be closed."

A police spokeswoman said: "Things are exploding in the truck and firefighters are waiting for more water to arrive."