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A Stage 3 Yellow flag flies in the Paso de Cortes area near Popocatepetl volcano, behind left, in Mexico, Monday, July 8, 2013. Mexico's National Center for Disaster Prevention raised the volcano alert to Stage 3 Yellow, the final step before a Red alert, when possible evacuations could be ordered. A Stage 3 Yellow alert had been in effect during eruptions earlier this year until early June, when it was lowered. (Photo by Marco Ugarte/AP Photo)
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