Firefighters battle a blaze possibly resulting from a high-pressure gas-line explosion in San Bruno, Calif., on Thursday, Sept. 9, 2010. (AP Photo/Bay Area News Group, Karl Mondon)

Photo by: Karl Mondon

Firefighters battle a blaze possibly resulting from a high-pressure gas-line explosion in San Bruno, Calif., on Thursday, Sept. 9, 2010. (AP Photo/Bay Area News Group, Karl Mondon)