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People run for cover as police converge to the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO / Mandel NGAN/AFP/Getty Images ( 523486425 )

A policeman runs after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523487279 )

A man runs for cover as a police officer takes a shooting position at the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO / Mandel NGAN/AFP/Getty Images ( 523486468 )

People run for cover as police converge to the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO / Mandel NGAN/AFP/Getty Images ( 523486378 )

Capitol Hill police are seen at the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO / Mandel NGAN/AFP/Getty Images ( 523486504 )

A US Capitol Police Officer runs while reacting to a call of shots fired on Capitol Hill October 3, 2013 in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 523486531 )

People run for cover as police converge to the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO / Brendan SMIALOWSKI/AFP/Getty Images ( 523486562 )

A Capitol Police Officer directs people away from a door on Capitol Hill October 3, 2013 in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 523486554 )

Police react on Capitol Hill October 3, 2013 in Washington, DC, after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene.AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 523486606 )

People take cover as gun shoot being heard at the Capitol in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523486621 )

Capitol Hill police and medics take a shooting victim away on a stretcher at the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO / Mandel NGAN/AFP/Getty Images ( 523486737 )

Capitol Hill police and medics take a shooting victim away on a stretcher at the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP PHOTO / Mandel NGAN/AFP/Getty Images ( 523486790 )

People take cover as gun shots were being heard at the US Capitol in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523486727 )

A member of the US Secret Service looks out toward Lafayette Park from the roof of the White House in Washington, DC, October 3, 2013, following reports of a shooting at the US Capitol. AFP PHOTO / Saul LOEB/AFP/Getty Images ( 523486881 )

Members of the U.S. Secret Service Uniform Division ride bicycle patrols around the perimeter of the White House October 3, 2013 in Washington, DC. The executive mansion was put on lockdown after a report of shots fired at the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images) ( 182998665 )

A member of the U.S. Secret Service counter assult team patrols the grounds of the White House October 3, 2013 in Washington, DC. The executive mansion was put on lockdown after a report of shots fired at the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images) ( 182998677 )

Reporters gather on the North Lawn of the White House October 3, 2013 in Washington, DC. The executive mansion was put on lockdown after a report of shots fired at the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images) ( 182998696 )

U.S. Park Police mounted officers and Secret Service Uniformed Division police patrol the perimeter around the White House October 3, 2013 in Washington, DC. The executive mansion was put on lockdown after a report of shots fired at the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images) ( 182998775 )

A member of the U.S. Secret Service counter assult team patrols the grounds of the White House October 3, 2013 in Washington, DC. The executive mansion was put on lockdown after a report of shots fired at the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images) ( 182998776 )

Pedestrians wait by temporary barriers after the area around the White House was put on lockdown October 3, 2013 in Washington, DC. The executive mansion was put on lockdown after a report of gun shots fired at the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images) ( 182998778 )

Capitol Hill police officers respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/ Evan Vucci) ( Capitol Lockdown )

Capitol Hill police officers respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/ Evan Vucci) ( Capitol Lockdown )

Tourists are kept away from the north side of the White House in Lafayette Park across Pennsylvania Avenue in Washington, DC, October 3, 2013, following reports of a shooting at the US Capitol. The US Capitol was under security lockdown Thursday after what senators and journalists said were shots fired outside Washington's seat of Congress. "We heard what was about four shots," said Senator Bernie Sanders as tourists and lawmakers rushed into the building to take cover and police hurried to secure the area. Emergency vehicles converged on the scene, focused on the north side of the iconic landmark, where an AFP photographer saw visitors scattering and ducking for cover. Just over a mile away, the White House was also placed in lockdown, with Secret Service agents in tactical gear deploying around the building. AFP PHOTO / Saul LOEB/AFP/Getty Images ( 523487121 )

A member of the US Secret Service stands guard on the North Lawn of the White House in Washington, DC, October 3, 2013, following reports of a shooting at the US Capitol. "We heard what was about four shots," said Senator Bernie Sanders as tourists and lawmakers rushed into the building to take cover and police hurried to secure the area. Emergency vehicles converged on the scene, focused on the north side of the iconic landmark, where an AFP photographer saw visitors scattering and ducking for cover. AFP PHOTO / Saul LOEB/AFP/Getty Images ( 523487140 )

Police officers attend to an injured police officer after shooting near the Capitol in Washington, DC, on October 3, 2013. A volley of shots rang out outside the US Capitol building on Thursday, sending lawmakers and tourists scattering for cover and triggering a massive security operation. Senators told reporters at the iconic Washington landmark, the seat of Congress, that they had heard up to six shots. Police sealed off the building as emergency vehicles converged at the scene. About half an hour after the incident began, the security lockdown at the Capitol was eased and the doors reopened. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523487216 )

Seen from the inside of the US Capitol, Capitol Police respond to reports of a shooting outside of the Senate side of the US Capitol on October 3, 2013 in Washington, DC. "We heard what was about four shots," said Senator Bernie Sanders as tourists and lawmakers rushed into the building to take cover and police hurried to secure the area. Emergency vehicles converged on the scene, focused on the north side of the iconic landmark, where an AFP photographer saw visitors scattering and ducking for cover.AFP PHOTO/Mandel NGAN/AFP/Getty Images ( 523487186 )

Police run after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523487370 )

Members of the uniform division of the Secret Service stand in the driveway of the White House in Washington, Thursday, Oct. 3, 2013, as access to Pennsylvania Ave., was temporarily denied, after reports of shots on Capitol Hill. (AP Photo/Pablo Martinez Monsivais) ( White House Security )

A U.S. Park Police helicopter is loaded on the Mall in Washington, Thursday, Oct. 3, 2013, with a victim from a shooting. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/Alex Brandon) ( Capitol Lockdown )

Police gather near the scene on Capitol Hill in Washington, Thursday, Oct. 3, 2013, after gunshots were heard. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/Alex Brandon) ( Capitol Lockdown )

Law enforcement personnel gather around a police vehicle that was involved in an incident with another vehicle on Constitution Avenue outside the U.S. Capitol October 3, 2013 in Washington, DC. Capitol police locked down the facility during the incident. (Photo by Win McNamee/Getty Images) ( 182999122 )

Law enforcement personnel respond to an incident on Constitution Avenue outside the U.S. Capitol October 3, 2013 in Washington, DC. Capitol police locked down the facility during the incident. (Photo by Win McNamee/Getty Images) ( 182999368 )

A police officer checks out a car on grass with his canine near the U.S. Capitol October 3, 2013 on Capitol Hill in Washington, DC. The US Capitol and the White House were placed on lockdown after an 'active shooter' situation was reported. (Photo by Mark Wilson/Getty Images) ( 182999379 )

U.S. Secret Service Uniform Division officers and Metropolitan Police Department officers investigate a vehicle security barrier outside the White House October 3, 2013 in Washington, DC. Two people were injured after a car chase began at this barrier and ended near the U.S. Capitol with gun shots fired. (Photo by Chip Somodevilla/Getty Images) ( 183000964 )

U.S. Secret Service Uniform Division officers and Metropolitan Police Department officers investigate a vehicle security barrier outside the White House October 3, 2013 in Washington, DC. Two people were injured after a car chase began at this barrier and ended near the U.S. Capitol with gun shots fired. (Photo by Chip Somodevilla/Getty Images) ( 183000907 )

Capitol Police are seen in front of the Hart Senate Office Building following reports of a shooting on October 3, 2013 in Washington, DC. A volley of shots rang out outside the US Capitol building on Thursday, sending lawmakers and tourists scattering for cover and triggering a massive security operation. Senators told reporters at the iconic Washington landmark, the seat of Congress, that they had heard up to six shots. Police sealed off the building as emergency vehicles converged at the scene. About half an hour after the incident began, the security lockdown at the Capitol was eased and the doors reopened. AFP Photo/Jim WATSON/AFP/Getty Images ( 523487979 )

Police and FBI begin an investigation and place evidence markers on Constitution Avenue in front of Hart Senate Office Building on Capitol Hill October 3, 2013 in Washington, DC. A volley of shots rang out outside the US Capitol building on Thursday, sending lawmakers and tourists scattering for cover and triggering a massive security operation. Senators told reporters at the iconic Washington landmark, the seat of Congress, that they had heard up to six shots. Police sealed off the building as emergency vehicles converged at the scene. About half an hour after the incident began, the security lockdown at the Capitol was eased and the doors reopened. AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 523487753 )

Police respond to a reported shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. (AP Photo/Molly Riley) ( Capitol Lockdown )

First responders put a police officer on the stretcher after pulling his out of a wrecked police car after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523488475 )

A police cruiser is wrecked after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523488705 )

US Capitol Hill Police Chief Kim Dine briefs the media after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523488613 )

Security personnel lockdown a street after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523488768 )

Police react after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill in Washington, DC, on October 3, 2013. The US Capitol was placed on security lockdown Thursday after shots were fired outside the complex, senators said. "Shots fired outside the Capitol. We are in temporary lock down," Senator Claire McCaskill said on Twitter. Police were seen running within the Capitol building and outside as vehicles swarmed to the scene. AFP Photo/Jewel SAMAD/AFP/Getty Images ( 523488658 )

A U.S. Capitol police officer lies on the steps of the Senate with a gun drawn in response to a report of shots fired Thursday, Oct. 3, 2012. A police officer was reported injured after gunshots at the U.S. Capitol. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. (AP Photo/The Tampa Bay Times, Alex Leary) ( Capitol-Lockdown )

Police converge on the scene of a shooting on Constitution Avenue on Capitol Hill near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. (AP Photo/J. Scott Applewhite) ( Capitol Lockdown )

This view is from the Russell Senate Office Building shows police converging on the scene of a shooting on Constitution Avenue on Capitol and near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. (AP Photo/J. Scott Applewhite) ( Capitol Lockdown )

A Capitol Police officer runs through the first floor of the Senate on Capitol Hill in Washington, Thursday, Oct. 3,2013, during the lockdown order following a shooting on Constitution Avenue on Capitol Hll and near the Supreme Court. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. (AP Photo/J. Scott Applewhite) ( Capitol Lockdown )