Work on sewer lines near the explosion in 2008 used "pipe bursting" method known to carry risk to nearby pipes. Schwarzenegger calls for federal disaster relief as Obama proposes tighter oversight.
Federal investigators are examining whether work on a sewer near a natural gas pipeline in San Bruno two years ago played a role in the explosion and fire that leveled part of the Bay Area suburb last week in one of the nation's deadliest pipeline failures in nearly a generation.
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