Mexico Says Pemex Gas Buildup Caused Deadliest Blast Since 2006

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A Petroleos Mexicanos worker receives a vaccination shot from a nurse... News PhotoAccidents and Disasters,Built Structure,Business,Exploding,Finance,Fuel and Power Generation,Gasoline,Headquarters,Healthcare And Medicine,Horizontal,Mexico,Mexico City,North America,Nurse,Occupation,Petroleos Mexicanos,Receiving,Security,The Americas,The Media,USA,VaccinationPhotographer Collection: Bloomberg 2013 BloombergA Petroleos Mexicanos (Pemex) worker receives a vaccination shot from a nurse during cleanup operations at the company's headquarters building in Mexico City, Mexico, on Tuesday, Feb. 5, 2013. Mexican authorities said a buildup of gas led to the blast last week that killed 37 people at Petroleos Mexicanos’s headquarters, the first official attempt to explain the nation’s deadliest explosion since 2006. Photographer: Susana Gonzalez/Bloomberg via Getty Images