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A cloud of ash belches out of Mexico’s Popocatepetl volcano, some 55 km from Mexico City, as seen from Cholula, in the Mexican central state of Puebla, on May 15, 2013. The volcano spewed a new column of ash late Tuesday, with some of the material falling on three towns while glowing rocks landed on the towering mountain’s slope. Authorities have raised the alert level to “Yellow Phase Three,” the fifth of a seven-stage warning system, restricting access to an area of 12 km around the volcano while preparing evacuation routes and shelters. (Photo by Arturo Andrade/Getty Images)
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