Members of Congress were among the first to issue reports of shots being fired outside the Capitol, sending out Twitter messages and reassurances of their own safety. 

Sen. Claire McCaskillClaire Conner McCaskillBiden, lawmakers mourn Harry Reid Harry Reid, political pugilist and longtime Senate majority leader, dies On The Trail: Trump-inspired challengers target GOP governors MORE (D-Mo.) was the first member to tweet.



Initial reports suggested the shooting happened on the House side of the Capitol, but the entire complex went on lockdown, Rep. Joaquin Castro (D-Texas) said.



Rep. Grace Meng (D-N.Y.) posted a picture of a police officer pointing a gun toward the outside of the Capitol. BuzzFeed reporter Kate Nocera first posted the photo.

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Other members tweeted they were told to “shelter in place,” and that their staffs were safe.



Sen. Kelly AyotteKelly Ann AyotteThese Senate seats are up for election in 2022 Biden's FDA nominee advances through key Senate committee The 10 races that will decide the Senate majority MORE (R-N.H.) also tweeted that she was safe and expressed concern for anyone injured. 



The House, which was in session, had to go into recess.



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Multiple reports said a Capitol police officer had been shot, and was injured.



An alleged shooter was taken down, according to multiple reports.



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Rep. Jared Polis (D-Colo.) tweeted the alert he received via text message.




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But many lawmakers and congressional reporters said they didn’t know what was happening.