Pemex Probing Lethal Blast Amid Drive to Boost Security

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A Petroleos Mexicanos worker looks at debris at the Petroleos... Photo d'actualitéAmérique du Nord,Catastrophe et désastre,Continent américain,Employé de l'administration,Essence,Exploser,Finance,Mexico,Mexique,Média,Métier,Petróleos Mexicanos,Production d'énergie,Regarder,Sécurité,Vertical,États-UnisPhotographer Collection: Bloomberg 2013 BloombergA Petroleos Mexicanos (Pemex) worker looks at debris 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