UPDATE: Shots fired at U.S.Capitol, female suspect killed in gunfight
By Michael O'Brien, Pete Williams and Richard Esposito, NBC News
The United States Capitol was placed on lockdown Thursday afternoon after a woman tried to ram a car into the White House gate, was chased by Secret Service and exchanged shots with police, sources said.
The suspect — who sources said had a child in the car — was shot and killed, and a shelter-in-place order was lifted at about 3 p.m. At least one Capitol Police officer was injured during the pursuit.
"This appears to be an isolated incident," said Capitol Police Chief Kim Dine. "Both scenes are under control."
NBC's Brian Williams reports on the shooting at the US Capitol, with NBC's Kelly O'Donnell in the Capitol building, NBC's Pete Williams with what's known about the shootings, and NBC's Kristen Welker at the White House.
President Barack Obama was briefed about the harrowing incident, which came in the midst of the government shutdown that has created a tense atmosphere on Capitol Hill.
"The United States Capitol Police have stabilized the incident," officials said in a message.
The incident began a little after 2 p.m. when the woman tried to breach White House security at 15th St. and E but didn't get through, law-enforcement sources said.
As she was being chased, she bailed out of the car and began firing and was shot, the sources said.
An NBC satellite truck operator saw several police cars with lights flashing near the gardens below the Capitol when he suddenly heard rapid-fire shots. Several police cars could then be seen chasing the black car, he reported.
The FBI responded to the scene, and a helicopter landed in front of the Capitol to medevac the injured officer.
A message from the Capitol Police ordered anyone in a House office to "shelter in place," but that order was lifted a short time later.
The House recessed, and the Senate went into a quorum call — dispensing momentarily with its official business — shortly thereafter.
"We've locked the doors. We closed the window shades. And we are awaiting further instructions," Rep. Jared Polis (D-Colo.) told MSNBC during the lockdown. "We're more or less cut off here. We're watching TV and just trying to figure out what happened."
Though it was over quickly, nerves were still jangled.
"Shaken is a good word to describe how I'm feeling," said Peter Plocki, a government worker furloughed during the shutdown who was on Capitol Hill to take a tour of the Supreme Court building and heard the shots.
Congress has been locked for the past week and a half in a contentious debate over funding the government, a disagreement in which contributed to a government shutdown that came to pass at the end of Monday.
Last night, Wisconsin Rep. Sean Duffy, R, was the victim of a "minor incident" outside of the Capitol complex.
"A random individual, unknown to the Congressman, began screaming at him and grabbed his arm," a spokesperson for Duffy said in describing the incident. "Mr. Duffy was unharmed. He reported the incident in compliance with House security procedures. Congressman Duffy has requested no further action be taken and there will be no further comment on the matter at this time."
On September 16, a deadly shooting occurred blocks south of the U.S. Capitol complex which contributed to a partial lockdown of the Capitol at that time.
A shooting on July 24, 1998 left two Capitol Police officers dead. And at a constituent event in her district in January 2011, then-Rep. Gabrielle Giffords, D-Ariz., was seriously injured and six others were killed in a shooting.
NBC News' Jonathan Dienst contributed to this report.