SAN DIEGO --
Officials say there are no immediate plans to tighten security at Southern California courthouses following an explosion at the federal courthouse in San Diego.Investigators think it was a pipe bomb that blew up early Sunday morning at the Edward J. Schwartz Federal Courthouse.
The blast damaged a door and blew out a window at the courthouse. Two guards were inside the building at the time of the explosion, but they were not injured.
No one has claimed responsibility for the bombing and no one has been arrested.
The building is closed Monday for repairs.
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