Update at 4:05 p.m. Police and witnesses say the gunfire outside the U.S. Capitol today began when a woman tried to ram through a White House barricade with her car.
They say the woman then led police on a chase that ended outside the Capitol. Police say the woman was taken into custody, and a young child who was with her was taken to a hospital.
A police officer was injured when the car crashed outside the Capitol, but the injuries weren't life-threatening. Police say no officers were wounded by gunfire.
A Congressman says police killed the driver outside Capitol.
The entire Capitol complex was locked down for about an hour. Both houses of Congress went into recess.
Witnesses say at least 20 police cars were involved in chasing the Infinity toward Capitol Hill. One tourist says he walked toward the scene, curious about what was going on -- but the he "heard the gunfire" and hit the ground.
Sen. John Thune's office released a statement on the incident:
Senator Thune and his staff are safe and grateful to the first responders on the scene for keeping them safe. Capitol police had everyone in the complex shelter in place and that order has now been lifted. Our thoughts and prayers are with those who were injured.
Rep. Kristi Noem said via Twitter:
My staff and I are safe and praying for anyone who may be injured. Thankful for the U.S. Capitol Police and their swift actions today.
Update at 2:20 p.m. Police have now ended the lockdown at the U.S. Capitol building. It began when gunshots were fired outside the building today, reportedly injuring a police officer.
Police say the shooting at Capitol is an isolated incident, not terrorism. The Associated Press is reporting a suspect is in custody, but their condition is not disclosed.
A tourist who was outside the building says the shooting unfolded after police chased a car up Constitution Avenue toward the Capitol. He says he "heard the gunfire" and hit the ground.
Senator Bob Casey of Pennsylvania says he was walking from the Capitol to a Senate office building when he noticed several police officers riding quickly up Constitution Avenue on motorcycles. He says he then heard three to five "pops" -- and that officers soon moved everyone into the Capitol building.
As a warning was sounded, the House went into recess. The Senate also suspended business.
The House had just approved legislation aimed at partly lifting the government shutdown by paying National Guard and Reserve members.