Pemex Probing Lethal Blast Amid Drive to Boost Security

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Mexican soldiers clean up debris and recover administrative documents... News PhotoAdministrator,Army Soldier,Document,Emergencies and Disasters,Exploding,Finance,Fuel and Power Generation,Gasoline,Horizontal,Mexico,Mexico City,North America,Petroleos Mexicanos,Recovery,Security,The Americas,The Media,USAPhotographer Collection: Bloomberg 2013 BloombergMexican soldiers clean up debris and recover administrative documents at the Petroleos Mexicanos (Pemex) administrative building in Mexico City, Mexico, on Sunday, Feb. 3, 2013. The search for the cause of a blast that destroyed three floors of a building at Pemex' headquarters and killed at least 34 people entered a fourth day, as investigators toiled ahead of a self-imposed deadline for finding an answer. Photographer: Susana Gonzalez/Bloomberg via Getty Images