Pemex Probing Lethal Blast Amid Drive to Boost Security

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Petroleos Mexicanos workers talk about the debris at the Pemex... Fotografia de notíciasAdministrador,América do Norte,As Américas,Cidade do México,Combustíveis e Geração de Energia,EUA,Emergências e Desastres,Explodir,Falar,Finanças,Gasolina,Horizontal,Meios de Comunicação,México,Ocupação,Petróleos Mexicanos,Sob proteçãoPhotographer Collection: Bloomberg 2013 BloombergPetroleos Mexicanos (Pemex) workers talk about the debris at the 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