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Few people were around the building, which is a block from nightclubs in the Gaslamp Quarter, when the powerful blast also damaged the lobby area of the Edward J. Schwartz Federal Courthouse about 1:40 a.m., said FBI spokeswoman April Langwell.

The bomb was reported by two guards in the building, who were uninjured. About 40 agents combed the front courtyard after the area was swept for explosives. No arrests have been made.

Debris was found lodged in a window about eight stories up the AT&T building that faces the courthouse.

Authorities said that surveillance cameras outside the building may provide information, but that no cameras directly face the doorway.

Streets in the area have been closed during the investigation. The courthouse will remain closed Monday as repairs are made.

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