Pemex Probing Lethal Blast Amid Drive to Boost Security

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Petroleos Mexicanos workers place recovered documents into a plastic... Fotografía de noticiasAdministrador,América del norte,Bolsa,Ciudad de México,Documento,EE.UU.,Emergencias y desastres,Explotar,Finanzas,Gasolina,Horizontal,Las Américas,Medidas de seguridad,Medios de comunicación,México,Oficio,Petróleos Mexicanos,Plástico,Producción de combustible y energía,RecuperaciónPhotographer 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