The United States Capitol is on lockdown with reports that an active shooter is in or near the building on Capitol Hill in D.C. There are unconfirmed reports that one officer may have been shot.
The lockdown was placed mid-afternoon on Thursday, October 3, 2013 and police are responding to the scene.
UPDATE 3:05 p.m. ET: The Senate Sergeant-at-Arms reports that the lockdown at the Capitol has been lifted. This word came out at about 3 p.m., around 40 minutes after the shots were first fired.
#USCapitol Shelter in Place has been lifted. You may exit shelter locations & resume normal activities. Thanks for your cooperation. #alert - @SenateSAA, Twitter
Capitol Police ordered anyone in a House office to "shelter in place" and "close, lock and stay away from external doors and windows."
CNN reports that while the gunshots were unconfirmed, The House recessed shortly after word that there might be an active shooter in the Capitol building.
Twitter is buzzing with word of a possible shooter.
Colorado Rep. Jared Polis tweeted, "There had been some short of shooting here at the capital, we r on lockdown awaiting more info."
Rep. Tim Griffin (R-Ark.) reported a short time ago that he was told the shooter had been arrested. Griffin tweeted, "I am told shooter has been arrested. House floor activity stopped for now."
FBI spokesperson Lindsay Godwin stated at approximately 2:34 p.m. ET that the bureau’s National Capital Response squad "is responding to the Capitol."
She did not provide any additional information on reports of shots being fired.