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New Zealand's Mount Tongariro erupts

21 November 2012 Last updated at 10:23 GMT

A volcano has erupted on New Zealand's North Island, sending a column of ash high into the atmosphere.

The official (GNS Science) monitoring service issued a potential threat alert after Mount Tongariro started spewing smoke and steam.

There are no immediate reports of damage. It is the second eruption of the mountain this year.