A US Republican politician and aides have been shot during baseball practice in Virginia, US reports say.
Police in the upmarket Washington DC suburb of Alexandria said they were investigating a "multiple shooting" and a suspect was in custody.
Fox News said House of Representatives Majority Whip Steve Scalise and aides have been hit by gunfire.
Police tweeted they were "investigating multiple shooting 400 block E Monroe St. Suspect believed in custody."
An apparent eyewitness said on Twitter that gunfire rang out at the YMCA baseball fields, by the Eugene Simpson Stadium Park.
The witness, @ben_childers, said it happened at a congressional baseball team practice session.
Local media report there is a major police presence after the attack.