Smoke rises from the Popocatepetl as it spews incandescent volcanic material on the outskirts of Puebla July 4, 2013. The 5,450-metre (17,900 ft) Popocatepetl volcano has been kept on yellow phase two alert, the second-highest warning on the center’s seven-step scale, according to local media. REUTERS/Imelda Medina (MEXICO – Tags: ENVIRONMENT TPX IMAGES OF THE DAY) – RTX11CF7

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