Calbuco volcano erupts in Chile Photogallery

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Officials ordered an evacuation for a 20-kilometer (12-mile) radius around the volcano and the interior ministry rushed in the army to temporarily take control of the province of Llanquihue and the town of Puerto Octay.

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"People are very, very frightened," said Gervoy Paredes, the mayor of the largest city in the area, Puerto Montt, which was blanketed in a cloud of ash.

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"The situation is pretty complicated," he added, saying reports indicated the Blanco river was flooding because of ice melt triggered by the eruption.

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