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"An explosion at the Mexico City offices of state oil company Pemex was caused by a methane gas leak in the building's basement, the attorney general said."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Business_News/Energy-Industry/2013/02/05/Methane-gas-leak-sparked-Pemex-blast/UPI-65181360063645/?rel=64661360080106>