Pemex Probing Lethal Blast Amid Drive to Boost Security

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A black ribbon is displayed at the entrance of the Petroleos... News PhotoAccidents and Disasters,Administrator,Built Structure,Entrance,Exploding,Finance,Fuel and Power Generation,Gasoline,Horizontal,Mexico,Mexico City,North America,Petroleos Mexicanos,Security,The Americas,The Media,USAPhotographer Collection: Bloomberg 2013 BloombergA black ribbon is displayed at the entrance of the Petroleos Mexicanos (Pemex) administrative building in Mexico City, Mexico, on Friday, Feb. 1, 2013. Pemex is stepping up security at oil production facilities as authorities investigate a blast that killed at least 33 people at the state-owned company’s headquarters in Mexico City yesterday. Photographer: Susana Gonzalez/Bloomberg via Getty Images