The gunman, a white man with dark hair, wearing a blue shirt, could be seen standing with a rifle as he began shooting, Flake said. « Fifty would be an understatement, » Flake said, referring to the number of shots.

Scalise, 51, was standing on second base, fielding balls during batting practice when the shooting began, Flake said. 

« We climbed into the dugout » to shelter and treat the wounded, Flake said. 

Police returned fire, and « when we heard the shooter was down, » he and others ran onto the field to help Scalise until medics arrived, Flake said. 

Alexandria police chief Michael Brown said his officers arrived on the scene within two to three minutes and engaged the shooter.

Matthew Verderosa, chief of the U.S. Capitol Police, said police were interviewing multiple witnesses on the scene.

If police had not been at the scene, « it would have been a massacre, » Paul said. « As terrible as it is, it could have been a lot worse. »

The members of Congress were practicing for a charity ballgame. « We practice 20 or 30 times » over a period of several weeks before the game, Paul said.

Paul said he heard perhaps 50 to 60 shots, which he said sounded like they were coming from an AR-15 or similar rifle.

Capitol Police officers were present because Scalise, a member of the congressional leadership was there.

« We were really lucky that they were there, » he said.

White House Press Secretary Sean Spicer tweeted that President Trump was aware of the shooting.