US Capitol police said today that they ended their search of the U.S. House of Representatives Rayburn office building and re-opened the building for regular business after a security incident.
The reopening came nearly five hours after police declared a lock-down because of a report to police of the sound of gunfire in the garage of the Rayburn building.
Police spokeswoman Kimberly Schneider said there were no reports of injuries and police were continuing to investigate the incident but did not have any evidence of a gunman.
"We have not gotten any reports of anybody being captured, anybody being arrested. We have not identified anybody who may have a weapon on them at this time," Ms Schneider told reporters.
Many members of Congress had left Washington, getting an early start on a weeklong congressional recess. The House was not in session and the Senate was winding down.