There was a gas pipeline leak and explosion in San Bruno yesterday night that killed at least four people and destroyed 53 homes.
It was likely that the leak was happening for a couple of weaks and saturated the soil before it exploded.
Here is the US department of transportation statistics on pipeline accident property damage and fatalities. there are about 300 significant (at least $50,000 or a fatality or hospitalization) and 50 serious incidents (at least one fatality or hospitalization).
Here is a wikipedia list of natural gas and oil pipeline accidents.
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