By MICHAEL WEISSENSTEINMEXICO CITY (AP) â¿¿ A water-heating system may have leaked gas into a tunnel beneath the headquarters of Mexico's national oil company for more than seven months before it was accidentally detonated by a maintenance crew's improvised lighting system, officials said Tuesday, adding fresh detail to the narrative of the petroleum giant's worst disaster in a decade.
Heating System Suspect In Mexico Oil Company Blast
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