12 of 12: Mexican federal police guard after an explosion at a gas pipeline distribution center in Reynosa, Mexico near Mexico's border with the United States, Tuesday Sept. 18, 2012. Mexico's state-owned oil company, Petroleos Mexicanos, also known as Pemex said the fire had been extinguished and the pipeline had been shut off but ten people were killed during the incident. (AP Photo/El Manana de Reynosa) (AP Photo/ El Manana de Reynosa)

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