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SAN DIEGO (AP) — Authorities have reported that a suspected pipe bomb exploded at a federal courthouse in downtown San Diego early Sunday, damaging the front entrance and blowing out a window. No injuries were reported.

Two guards posted at the building reported the bomb. Both were uninjured. About 40 agents combed the front courtyard after the area was swept for explosives. No arrests have been made.

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 evidence collected will be sent to an FBI laboratory in Virginia for analysis by bomb experts.

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 were closed until early Sunday afternoon. The courthouse will remain closed Monday as repairs are made.

No one has claimed responsibility for the blast, authorities said.