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The explosion of a gas pipeline on Sept. 9, 2010, sparked a fire in San Bruno that destroyed 38 homes. (Justin Sullivan / Getty Images)

The explosion of a gas pipeline in San Bruno on Sept. 9, 2010, sparked a fire that destroyed 38 homes. (Justin Sullivan / Getty Images)

The explosion of a gas pipeline in San Bruno on Sept. 9, 2010, sparked a fire that destroyed 38 homes. (Justin Sullivan / Getty Images)