A building on Capitol Hill was evacuated for about an hour Friday morning because of an alarm, officials said.

The building — the Ford U.S. House Office Building — was evacuated about 9 a.m. due to an “audible alarm,” said a spokeswoman for the U.S. Capitol Police.

Eva Malecki, the spokeswoman, said it was “not anything serious.” She wrote in an email that it was a “minor water issue that [the] Architect of the Capitol is working [on] that set off an alarm.”

An official at the Architect of the Capitol office said in an email a broken water line caused flooding that damaged a fire alarm panel.

Just before 10 a.m., officials said the incident was cleared and people were being allowed back into the building.

Some streets around the U.S. Capitol were briefly closed as a result of the incident.