Large Explosion
Emergency workers patiently sifts through rubble of a burned down home, three days after a natural gas pipeline exploded into a deadly fireball in San Bruno, Calif., Sunday, Sept. 12, 2010. (AP Photo/Tony Avelar)
Emergency workers patiently sifts through rubble of a burned down home, three days after a natural gas pipeline exploded into a deadly fireball in San Bruno, Calif., Sunday, Sept. 12, 2010. (AP Photo/Tony Avelar)