Pemex Probing Lethal Blast Amid Drive to Boost Security

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Mexican soldiers, wearing the identification of Plan DN-III-E, clean... NyhetsfotoAdministratör,Amerika,Armésoldat,Bensin,Energiproduktion,Explodera,Finansväsen,Horisontell,Identitet,Media,Mexico City,Mexiko,Nordamerika,Nödfall och katastrofer,Petroleos Mexicanos,Trygghet,USAPhotographer Collection: Bloomberg 2013 BloombergMexican soldiers, wearing the identification of Plan DN-III-E, clean up 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