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The Tungurahua volcano spews ash and stones during an eruption as seen from Cotalo, Ecuador, Saturday April 30, 2011. Tungurahua hurled truck-sized pyroclastic boulders more than a mile in a powerful eruption that prompted at least 300 people to flee their homes, authorities said. The volcano, some 85 miles southeast of Quito, has been active since 1999. (KEYSTONE/AP Photo/Dolores Ochoa)