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Fear in the Capitol - The Capitol was on lockdown on Thursday after Miriam Carey, 34, tried to ram through a White House barricade with her black car. She later led police on a car chase near the Capitol Building, where she was shot and killed by police. — Dominique Zonyéé(Photo: EPA/MICHAEL REYNOLDS/LANDOV)

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Likely Not Terror Related - Police said the shooting, which comes two weeks after a mentally disturbed employee killed 12 workers at the Washington Navy Yard, was an isolated incident.(Photo: JIM WATSON/AFP/Getty Images)

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Shots Fired - People take cover after shots fired were reported near 2nd Street North West and Constitution Avenue on Capitol Hill in Washington, D.C., Thursday afternoon.    (Photo: JEWEL SAMAD/AFP/Getty Images)

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A Dangerous Scene - Travis Gilbert told the Chicago Tribune 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."(Photo: JEWEL SAMAD/AFP/Getty Images)

Photo By Photo: JEWEL SAMAD/AFP/Getty Images

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Car Chase Leads to Car Crash - The chase resulted in a vehicle crash, injuring several people, including two law enforcement officers; one from Capitol Hill Police and the other from the Secret Service.(Photo: REUTERS/KEVIN LAMARQUE/LANDOV)

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Damage Is Done - Two U.S. Capitol Police cars sit damaged after colliding during the pursuit of the black vehicle.(Photo: REUTERS/JASON REED/LANDOV)

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Officer Down - Capitol Police and medics take the wounded officer away on a stretcher at the site of of the shooting.(Photo: MANDEL NGAN/AFP/Getty Images)

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The Crime Scene - An officer places emergency "Do Not Cross" tape near the Capitol building as the Metropolitian Police, the Secret Service and other officers investigate the incident.(Photo: Andrew Harrer/Bloomberg via Getty Images)

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"Heroic" Response Effort - The Secret Service and Capitol Police united to respond to reports of shots fired outside of the Hart Senate Office Building near the Capitol Building. "There were multiple shots fired and the air was filled with gunpowder," Berin Szoka told the Associated Press.(Photo: UPI/Kevin Dietsch/LANDOV)

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The Aftermath - A view of the crashed black vehicle and a Capitol Police cruiser, after the unarmed suspect was shot and killed by police.(Photo: BRENDAN SMIALOWSKI/AFP/Getty Images)