By ANTARA News/Xinhua,
Los Angeles : A pipe bomb exploded at a federal courthouse in downtown San Diego, about 80 miles (128 kilometers) south of Los Angeles on Sunday.
The explosion damaged a door and blown out a window but there was no immediate report of injuries, authorities said.
The blast occurred early Sunday at the Edward J. Schwartz Federal Courthouse and caused damage at the building`s front entrance and lobby area, FBI spokeswoman April Langwell said.
No one has been arrested in connection with the blast and it remained unknown whether it was a terrorist attack.
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