Work on a pipeline control center triggered electrical problems and led to a rise in gas pressure before the blast, the NTSB says. It's not clear what role the event played in the pipeline failure.
Maintenance work at a pipeline control center triggered electrical problems and a rise in gas pressure just before a major transmission line exploded last month in San Bruno, killing eight and setting off an inferno that destroyed dozens of homes, according to a preliminary National Transportation Safety Board report released Wednesday.
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