Fire and Emergency New Zealand are responding to reports of an explosion in Tongariro.

A spokesperson said 10 appliances are on their way from Whanganui, Rotorua and Palmerston North.

The incident reportedly occurred at a water bottling plant.

Police said there were reports of an explosion at the water treatment plant, but there were no reports of injuries.

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At 11pm, the police were still waiting for specialist vehicles to arrive at the scene from Whanganui.