California Gas Explosion

A massive fire roars through a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010. Fire crews flooded the ruins of burning homes with water early Friday after a massive explosion sent flames roaring through the San Francisco suburb, killing at least four people, injuring many others and destroying more than 50 houses.

Gas Blast Engulfs Neighborhood in Flames

A firefighter shoots water from his firehose at a massive fire, Thursday, Sept. 9, 2010 in San Bruno, Calif.

Gas Blast Engulfs Neighborhood in Flames

A fire fighting helicopter flys over a massive fire, Thursday, Sept. 9, 2010 in San Bruno, Calif. Utility officials said a gas line ruptured in the vicinity of the blast, which left a giant crater and sent flames tearing across several suburban blocks in San Bruno just after 6 p.m.

Gas Blast Engulfs Neighborhood in Flames

Firefighters shoot water from their firehoses during a massive fire, Thursday, Sept. 9, 2010, in San Bruno, Calif.

Gas Blast Engulfs Neighborhood in Flames

A helicopter drops water on a fire after an explosion in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames

Firefighters shoot water from their firehoses during a massive fire, Thursday, Sept. 9, 2010, in San Bruno, Calif.

Gas Blast Engulfs Neighborhood in Flames

Firefighters fight a massive fire in a residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010. More than 50 homes were destroyed, and at least one person was killed.

Gas Blast Engulfs Neighborhood in Flames

Emergency workers walk through a fire-ravaged residential neighborhood, Thursday, Sept. 9, 2010, in San Bruno, Calif. More than 50 homes were completely destroyed during the massive fire.

Gas Blast Engulfs Neighborhood in Flames

A helicopter dumps water on a part of a massive residential fire, Thursday, Sept. 9, 2010, in San Bruno, Calif.

Gas Blast Engulfs Neighborhood in Flames

A massive fire roars through a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010. A massive fire burned homes as it roared through a mostly residential neighborhood in the hills south of San Francisco following a loud explosion Thursday evening that shot a fireball more than 1,000 feet into the air and sent frightened residents fleeing for safety, witnesses said.

Gas Blast Engulfs Neighborhood in Flames

A woman is treated by firemen after an explosion in San Bruno, Calif., Thursday, Sept. 9, 2010. More than 50 homes were destroyed when a massive fire roared through a mostly residential neighborhood in San Bruno.

Gas Blast Engulfs Neighborhood in Flames

Cars and homes destroyed after a massive fire that roared through a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames

Firefighters race to massive fire that roared through a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames

A home for sale sign is shown in front of home that was destroyed after a massive fire that roared through a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames

A vehicle and home destroyed after a massive fire that roared through a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames

Police and fire officials meet at an area where evacuees gathered after a massive fire damaged a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames

A massive fire roars through a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames

Firemen are seen outside burning homes after an explosion in San Bruno, Calif., Thursday, Sept. 9, 2010. More than 50 homes were destroyed when a massive fire roared through a mostly residential neighborhood in San Bruno.

Gas Blast Engulfs Neighborhood in Flames

Jaime Molina, right, puts a blanket around his daughter Jazmin, 6, as his wife, Esmeralda, left, and their son Danny, 4, foreground, wait in an area where evacuees gathered after a massive fire damaged a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames

Evacuees gather on a bus for a briefing by police and fire officials after a massive fire damaged a mostly residential neighborhood in San Bruno, Calif., Thursday, Sept. 9, 2010.

Gas Blast Engulfs Neighborhood in Flames