A suspected gunman was wounded in a shooting on the US Capitol grounds in the country's capital and taken to hospital, police and congressional sources say.
A female bystander suffered injuries and was transported to hospital.
A US Capitol Police officer, who asked not to be identified, said that the suspected shooter was being transported to hospital for surgery.
CBS News reported two tourists at the Visitor Center had minor injuries from bullet ricochet.
Police did not identify or describe the suspect and added that there were no additional suspects.
A US government official told Reuters that initial reports were that a suspect walked into the Visitor Center, pointed a gun at a police officer on duty and a shootout erupted.
The official said no evidence had materialised of a connection to terrorism.
