scientists say it was likely caused by a meteor. a flood of calls were made to law enforcement agencies. the explosions shook homes from reno to sacramento to bakersfield. many people reported seeing a fireball just before the explosion. while i was out your watering and i just looked up and i saw it blowing over like that. it was just beautiful, really big with a lot of color and then it just disappeared there was a vapor trail in the sky that you could see for a half-hour after words but other than that, that was hit. i had never seen anything like that before in my life and astronomer believes the meteor broke up somewhere over the sierra as southwest of reno. a pg&e memo just disclosed reveals the san bruno pipeline that exploded in 2010 had a history of failures. the 1989 document details and investigation they did into what caused the leak in october of 1988. their conclusion, a defective welds on a seem and that is the same kind of failure that contributed to the