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Associated Press
Emergency responders walk toward the site on an explosion at a building part of Mexico's state-owned oil company PEMEX complex, in Mexico City, Thursday Jan. 31, 2013. The explosion killed more than 10 people and injured some 80 as it heavily damaged three floors of the building, sending hundreds into the streets and a large plume of smoke over the skyline. (AP Photo/Eduardo Verdugo)

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