Pemex Probing Lethal Blast Amid Drive to Boost Security

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Petroleos Mexicanos workers place recovered documents into a plastic... NachrichtenfotoAmerikanische Kontinente und Regionen,Benzin,Berufsbezeichnung,Dokument,Energieindustrie,Erholung,Explodieren,Finanzen,Horizontal,Medienwelt,Mexico City,Mexiko,Nordamerika,Notfall und Katastrophe,Petróleos Mexicanos,Plastikmaterial,Sicherheitsgefühl,Tragetasche oder Tragebeutel,USA,VerwalterPhotographer Collection: Bloomberg 2013 BloombergPetroleos Mexicanos (Pemex) workers place recovered documents into a plastic bag 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