News Actions Facebook Tweet Email U.S. Capitol Complex on lockdown Posted at 11:56 AM, Mar 28, 2016 and last updated 2016-03-28 14:59:30-04 U.S. Capitol Complex on lockdown due to a potential security threat. BREAKING: U.S. Capitol Complex on lockdown due to a potential security threat. pic.twitter.com/SuTtrCivj5— ABC News (@ABC) March 28, 2016 Scripps Only Content 2016 Sign up for the Headlines Newsletter and receive up to date information. now signed up to receive the Headlines Newsletter. Click here to manage all Newsletters Enter to Win Free Pizza!