The following are reports from washingtonpost.com, and confirmed by Mirror Washington reporter Ana Radelat:
The House and the Senate have both been recessed until further notice: 2:48 pm
Capitol Police tell staff to seek shelter
The U.S. Capitol Police sent out this message a short time ago:
SHELTER IN PLACE. Gunshots have been reported on Capitol Hill requiring staff in all Senate Office Buildings to immediately shelter in place. Close, lock and stay away from external doors and windows. Take annunciators, emergency supply kits and escape hoods; and move to your office’s assigned shelter in place location or the innermost part of the office away from external doors or windows. If you are not near your office, go to the office nearest to you and shelter with that office and then check in with your OEC. No one will be permitted to enter or exit the building until directed by USCP. Staff is advised to monitor the situation. Further information will be provided as it becomes available.