Police probe chaotic Capitol Hill car chase that ended with suspect shot dead

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Authorities hold news briefing on Capitol Hill shooting

Chase from White House to Capitol ends in gunfire

Authorities are investigating why a woman tried to ram a security barrier near the White House, setting off a high-speed pursuit that ended with the suspect being fatally shot near the U.S. Capitol and temporarily put the Hill on lockdown in what one witness described as "mass panic."

The chase and subsequent stand-off near the Capitol went down as lawmakers were debating under the dome about the partial government shutdown. Officials said it appears the incident had "no nexus to terrorism."

Police confirmed late Thursday that the suspect was killed after being struck by officers' gunfire.The Secret Service said she had a 1-year-old girl in the car, who was not injured.

The Associated Press identified the driver as 34-year-old Miriam Carey, of Stamford, Conn. The AP cited two law enforcement officials who spoke on condition of anonymity because they were not authorized to discuss an ongoing investigation.

Rep. Michael McCaul, R-Texas, told Fox News that the FBI is doing "a deep dive" on the suspect and that her motivation remains an open question. The agency is also investigating how long the woman had been in the D.C. area and whether she has a criminal background.

D.C. Police Chief Cathy Lanier said officers acted "heroically." She said two officers were injured -- one from the U.S. Capitol Police, the other from Secret Service -- but "both will be okay."

The USCP officer was released from MedStar Washington Hospital Center Thursday night.

McCaul, chairman of the House Homeland Security Committee, said that the woman originally tried to run down a Secret Service agent near the White House. The Secret Service later confirmed the officer was struck by the woman's car.

In a statement, it also said multiple gunshots were later fired at two locations near the Capitol.

According to U.S. Capitol Police, its officer was injured in a related car crash.

The FBI served a search warrant Thursday night in connection with the investigation and police cordoned off a condominium building in Stamford and the surrounding neighborhood in the shoreline city.

Terrance Gainer, the Senate sergeant at arms, told Fox News that this appears to be an "isolated incident."Gainer also said the injured Capitol Police officer crashed a police cruiser while trying to join the chase. The cruiser "seriously clipped" a barricade, he said, but the injuries are "not life threatening."

The chase and stand-off caused panic on Capitol Hill, with sirens blaring inside the building and lawmakers and their staff being ordered to stay in place. The lockdown was later lifted. Returning to the floor late Thursday afternoon, lawmakers thanked Capitol Police and other security officers and gave them a standing ovation.

Officials said the incident began with a car chase, which started when the suspect, driving a black sedan with Connecticut plates, tried to ram a barrier near the White House.

Several police cars pursued her to a location near the Capitol building.When they boxed her in, sources said, the driver got out and five or six shots were fired.

David Loewenberg, who witnessed the incident, said he saw an officer "hugging a child and taking that child away."

Eyewitnesses described a chaotic scene.

"We were definitely caught off guard, we were scared," said Matt Knuppeo, who said he was touring the Capitol building when the stand-off unfolded. "It was mass panic for a while."

"We just heard the gun shots -- pow pow pow pow," witness Emily Wheeler told Fox News.

The developments come as lawmakers were debating a series of small spending bills, amid the ongoing partial government shutdown.

The violence follows the mass shooting last month at the Washington Navy Yard, where a gunman killed 12 people. The gunman also died.

Fox News' Carl Cameron, Ed Henry, Catherine Herridge, Chad Pergram and Nicholas Kalman and The Associated Press contributed to this report.