Pemex Probing Lethal Blast Amid Drive to Boost Security

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A Petroleos Mexicanos worker looks at debris at the Petroleos... Fotografia de notíciasAdministrador,América do Norte,As Américas,Cidade do México,Combustíveis e Geração de Energia,EUA,Emergências e Desastres,Explodir,Finanças,Gasolina,Meios de Comunicação,México,Ocupação,Olhar,Petróleos Mexicanos,Sob proteção,VerticalPhotographer 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