Bailey and Griner were protecting House Majority Leader Steve Scalise, who is one of 10 Congress members who have a protective detail due to his leadership role as the third-ranking Republican in the House. Also hurt were police officers and congressional staffers.
David Bailey, 32, was one of the U.S. Capitol Police officers who was injured at Eugene Simpson Stadium Park at about 7 a.m.
Griner and Special Agent David Bailey engaged the gunman and shot him dead.
"It is clear to me, based on various eyewitness accounts, that without these two heroes, Agent Bailey and Agent Griner, many lives would have been lost", said Ryan, who got a standing ovation from the House chamber. "One was being treated and one was about to go into surgery".
The shooter has been identified as James T. Hodgkinson, a 66-year-old IL man who had in recent months been living out of his auto in the Alexandria area.
Democratic Rep. Cedric Richmond, a close friend of Scalise's and fellow member from Louisiana, said he told Speaker Paul D. Ryan recently that he had concerns about the safety of members "and the thought that violence would come to our family next".
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"Everybody probably would have died except for the fact that the Capitol Hill police were there and the only reason they were there is because we had a member of leadership on our team", Paul told MSNBC.
Griner and Bailey are part of Scalise's security detail.
"Her heroic actions yesterday don't surprise me in the least", Robinson said. "What a great job they did", Trump said. You're not on Facebook, Crystal, but I'm honored to know you. Jeff Flake, R-Arizona, sought safety.
Bailey has worked as a Capitol police officer for more than nine years, according to his LinkedIn page.
The bravery and quick response of U.S. Capitol Police prevented Wednesday's shooting at a Northern Virginia baseball field from becoming a "massacre", congressmen at the center of the terrifying ordeal said.