[freema]

Cindy, there have been quite a few explosions in San Diego of late, correct?

[freema]

Sun May 4, 2008
FBI looks into San Diego courthouse explosion

http://www.cnn.com/2008/US/05/04/courthouse.explosion/

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The FBI recovered more than 100 nails and shrapnel as far as two blocks from the courthouse, Foxworth said. Investigators believe the bomb may be linked to a blast April 25 that shattered the glass door of a FedEx building in San Diego

http://www.miamiherald.com/news/nation/AP/story/527971.html

[Marine_Uncle]

Could be a simple matter of not fully closing valves on gas welder tank etc..