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A major fire has engulfed a former dairy factory complex in Paerata, near Pukekohe.
Northern fire communications spokesman Scott Osmond said the fire was currently a third alarm, with about 20 trucks at the blaze.
Emergency services were called to the factory complex about 5.30pm.
A 30 metre by 10 metre building was on fire.
Mr Osmond said no one had been injured. The factory was occupied but it wasn't known what type of business now used the premises.