The shooting erupted during practice for an annual baseball game between lawmakers, wounding senior Republican Congressman Steve Scalise and at least four others in the Washington suburb of Alexandria, Virginia.
Multiple congressman at the scene in Alexandria, Va., said Rep. Steve Scalise, R-La., was among those wounded. "I am grateful for the fearless response from Capitol Police and first responders and am praying for the recovery of my friend Steve Scalise and the victims of today's attack".
Sen. Rand Paul, who was also at the practice, told MSNBC that he heard between 50 to 60 shots fired by the gunman.
"The first shot was kind of an isolated shot and everybody kind of looks up and says, 'Hey, what's that?'" "At that point, people were dropping". Scalise, who was fielding balls near second base, was struck early. "I think it was politically motivated", he said.
Mr Scalise, the House of Representatives majority whip, is understood to be in a stable condition. "I am not shot".
"People know this is the Republican baseball team practicing", he said.
Filous said she saw the shooter hit a uniformed law enforcement officer, who she said was later evacuated by helicopter. "This is awful. I got bloody running and jumping into the dugout".More news: Attorney General Jeff Sessions says he was never briefed on Russia probe
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Representative Mo Brooks told CNN the suspect appeared to be a white male, "a little bit on the chubby side".
"I'm shocked, I'm grieved, I'm numb about the shooting of my friend Steve Scalise". He also told CNN, "it would have been a massacre".
"Prior to entering surgery, the Whip was in good spirits and spoke to his wife by phone", Scalise's office said in a statement. A source told ABC News that Scalise's injury was not life-threatening. "You can see our security detail".
Victims were taken to hospitals and a suspected was "believed" to be in custody. The motive remains unknown.
The shooter opened fire at a baseball field at Eugene Simpson Stadium Park, across the parking lot from Alexandria's YMCA.
"We had a shooter come out to practice", he said, his voice and body shaking as he described the scene.