"The U.S. Capitol Police, working with federal, state and local intelligence partners, has concluded that 'there does not exist a known, credible threat against Congress or the Capitol Complex that warrants the temporary security fencing.'"

"Therefore, alterations to the temporary fencing around the Capitol will soon be made, and the National Guard presence will also begin to draw down. However, the USCP will continue to monitor the threat posture, and plans will be adjusted if and as needed."  

From a press release from Nancy Pelosi.