People run for cover as police converge to the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. (credit: Mandel Ngan/AFP/Getty Images)
U.S. Capitol Lockdown
People run for cover as police converge to the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. (credit: Mandel Ngan/AFP/Getty Images)
U.S. Capitol Lockdown
Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building on Thursday. Oct. 3, 2013. (credit: CBS News)
U.S. Capitol Lockdown
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. (credit: Mandel Ngan/AFP/Getty Images)
U.S. Capitol Lockdown
Capitol Hill police are seen at the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. (credit: Mandel Ngan/AFP/Getty Images)
U.S. Capitol Lockdown
A US Capitol Police Officer runs while reacting to a call of shots fired on Capitol Hill October 3, 2013 in Washington, DC. (credit: Brendan Smialowski/AFP/Getty Images)
U.S. Capitol Lockdown
A Capitol Police Officer directs people away from a door on Capitol Hill October 3, 2013 in Washington, DC. (credit: Brendan Smialowski/AFP/Getty Images)
U.S. Capitol Lockdown
People run for cover as police converge to the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. (credit: Brendan Smialowski/AFP/Getty Images)
U.S. Capitol Lockdown
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. (credit: Brendan Smialowski/AFP/Getty Images)
U.S. Capitol Lockdown
People take cover as gun shoot being heard at the Capitol in Washington, DC, on October 3, 2013. (credit: Jewel Samad/AFP/Getty Images)
U.S. Capitol Lockdown
Capitol Hill police are seen at the site of a shooting October 3, 2013 on Capitol Hill in Washington, DC. (credit: Mandel Ngan/AFP/Getty Images)
U.S. Capitol Lockdown
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. (credit: Mandel Ngan/AFP/Getty Images)
U.S. Capitol Lockdown
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. (credit: Mandel Ngan/AFP/Getty Images)
U.S. Capitol Lockdown
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. (credit: Saul Loeb/AFP/Getty Images)
U.S. Capitol Lockdown
People take cover as gun shots are heard at the Capitol in Washington, DC on October 3, 2013. (credit: Jewel Samad/AFP/Getty Images)
U.S. Capitol Lockdown
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. (credit: Mandel Ngan/AFP/Getty Images)
U.S. Capitol Lockdown
Seen from the US Capitol, tourists flee as Capitol Police are seen outside of the Senate side of the Capit October 3, 2013 in Washington, DC following reports of a shooting. (credit: Mandel Ngan/AFP/Getty Images)
U.S. 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. (credit: Saul Loeb/AFP/Getty Images)
U.S. Capitol Lockdown
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. (credit: Saul Loeb/AFP/Getty Images)
U.S. Capitol Lockdown
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. (credit: Chip Somodevilla/Getty Images)
U.S. Capitol Lockdown
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. (credit: MANDEL NGAN/AFP/Getty Images)
U.S. Capitol Lockdown
Police attend to injured person at the U.S. Capitol October 3, 2013 on Capitol Hill in Washington, DC. (credit: Alex Wong/Getty Images)
U.S. Capitol Lockdown
Police officers attend to an injured police officer after shooting near the Capitol in Washington, DC, on October 3, 2013. (credit: Jewel Samad/AFP/Getty Images)
U.S. Capitol Lockdown
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. (credit: Jewel Samad/AFP/Getty Images)
U.S. Capitol Lockdown
Police run after shots fired were reported near 2nd Street NW and Constitution Avenue on Capitol Hill in Washington, DC, on October 3, 2013. (credit: Jewel Samad/AFP/Getty Images)
U.S. Capitol Lockdown
Police swarm around car on grass near the U.S. Capitol October 3, 2013 on Capitol Hill in Washington, DC. (credit: Alex Wong/Getty Images)
U.S. Capitol Lockdown
U.S. Capitol police respond to reports of shots fired at the U.S. Capitol. October 3, 2013 in Washington, DC. Capitol police locked down the facility during the incident. (credit: Win McNamee/Getty Images)
U.S. Capitol Lockdown
Police attend to injured person at the U.S. Capitol October 3, 2013 on Capitol Hill in Washington, DC. (credit: Alex Wong/Getty Images)
U.S. Capitol Lockdown
FBI agents in SWAT gear respond to reports of shots fired at the U.S. Capitol. October 3, 2013 in Washington, DC. (credit: Win McNamee/Getty Images)
U.S. Capitol Lockdown
U.S. Capitol police respond to reports of shots fired at the U.S. Capitol. October 3, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images)
U.S. Capitol Lockdown
Law enforcement and rescue personnel respond to an incident on Constitution Avenue outside the U.S. Capitol October 3, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images)
U.S. 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. (Photo by Win McNamee/Getty Images)
U.S. Capitol Lockdown
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)
U.S. Capitol Lockdown
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)
U.S. 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. (credit: JEWEL SAMAD/AFP/Getty Images)
