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 but apparently not shot.

"This appears to be an isolated incident," said Capitol Police Chief Kim Dine. "Both scenes are under control."

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. [Link]