Pemex Probing Lethal Blast Amid Drive to Boost Security

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A Petroleos Mexicanos worker looks at debris at the Petroleos... Foto di attualitàAmerica del Nord,Amministratore,Benzina,Città del Messico,Composizione verticale,Continente americano,Esplodere,Evento catastrofico,Finanza,Guardare in una direzione,Industria energetica,Mass Media,Messico,Misure di sicurezza,Occupazione,Petróleos Mexicanos,Stati Uniti d'AmericaPhotographer 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