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. The US Capitol was placed on 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. AFP PHOTO/Mandel NGAN MANDEL NGAN — AFP/Getty Images