The gunman who walked into the U.S. Capitol Visitor Center and pointed his weapon at police officers has been wounded and apprehended, Reuters reports.

The suspect and a female bystander, who suffered wounds, were taken to the hospital, Capitol Police Chief Matthew Verderosa said at a news conference.

No police officers were injured, Verderosa said. He said it was unclear how many officers fired shots. A weapon was recovered on the scene and the suspect's vehicle was found on Capitol grounds, the police chief said.

The incident caused a lockdown in the seat of the U.S. Congress in the center of Washington D.C.

The U.S. Secret Service temporarily cleared tourists from an area around the White House, but activities quickly returned to normal. A report that a person tried to gain entry to the White House was incorrect, a Secret Service spokesman told Reuters.

"Based on initial investigation, we believe this is an act of a single person who has frequented the Capitol grounds before. There is no reason to believe this is anything more than a criminal act," Verderosa said.

Police are saying it was an isolated incident, and there is no threat to the public at large.