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WASHINGTON — The U.S. Capitol was briefly locked down on Thursday after gunshots were fired outside the building following a car chase across central Washington which ended with the woman who drove the car being shot, officials said.

One U.S. official said the woman was killed but this could not be confirmed immediately and a police official said he did not know the condition of the suspect.

A U.S. official said there was no apparent connection to terrorism and the police official said it appeared to be an isolated incident.

The shooting rattled the U.S. capital three weeks after a government contractor opened fire at the Washington Navy Yard, about 1.5 miles from the Capitol, killing 12 people and wounding three others before he was shot to death by police.

The incident began near the White House and ended near the U.S. Capitol, where the U.S. House of Representatives and Senate were in session. Lawmakers were trying to find a solution to a budget impasse that partially shut down the U.S. government this week.

Officials said a vehicle struck a security barrier at 15th and Pennsylvania Avenue, near the White House. Police chased the vehicle for about 1 1/2 miles to 2nd Street and Constitution Avenue, near the Capitol, where the shots were fired.

"I was just eating a hot dog over here and I heard about four or five gunshots, and then a swarm of police cars came in wailing their sirens," said Whit Dabney, 13, who was visiting from Louisville, Kentucky, and heard the shots a couple of blocks away.

Witness Travis Gilbert said several police cars chased a black sedan at high speed toward the Capitol.

"They ran all the red lights. It was a very dangerous situation," Gilbert said.

He said the car stopped outside the Capitol and he heard gunshots. One police car hit a bollard and was damaged.

An injured policeman was taken from the shooting scene in a Medevac helicopter, police said.

"He appears to be conscious and breathing but we're following up," Capitol Police Chief Kim Dine said. "As far as we know, no officer has been shot."

Dine said he believed there was a child in the car with the suspect.

Just before Capitol Police sealed off the Capitol building, the Senate and House were in session. On the Senate floor, Senator John McCain of Arizona was urging that President Barack Obama and a bipartisan group of senators launch negotiations to break the deadlock over government funding and a debt limit increase.

The House had just passed a bill to fund the National Guard and reservists who are not on active duty during the shutdown.

The Capitol police, who were deemed "essential" staff, were at work despite the shutdown but they are not being paid.

Senator Roger Wicker of Mississippi told MSNBC he heard sirens and saw police motorcycles go by and then heard four to six shots fired.

"I was walking in the direction of the gunshots, so I stopped and I noticed Senator Bernie Sanders of Vermont was headed my way. We both took cover behind an SUV," Wicker said. "And then police officers came and told us to get down."

The lockdown order at the Capitol was called off after about an hour and security along Independence Avenue was eased shortly before 3 p.m. (1900 GMT). Tourists were allowed back onto the Capitol grounds.

President Barack Obama was briefed on the incident, a White House official said, providing no further details.

In 1998, a gunman burst through a security checkpoint at the Capitol and killed two Capitol Police officers in an exchange of fire that sent tourists and other bystanders diving for cover. The suspect, Russell Eugene Weston Jr., was not charged with a crime because of apparent mental instability.

Seen from the US Capitol, tourists flee as Capitol Police are seen outside of the Senate side of the Capitol on October 3, 2013 in Washington. following reports of a shooting.