A general view shows police and first responder activity on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. An unidentified gunman opened fire at the US Navy Yard in Washington on Monday and wounded several people including two police officers, officials reported. Police and FBI agents descended on the area in force as helicopters buzzed overhead, amid reports the shooter was armed with an assault rifle and was on the loose in the complex. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, the Washington Post and other media reported. At one point a police helicopter hovering over the complex lowered a man down by rope into the compound. Police blocked off intersections around the Navy Yard as military troops in uniform stood guard at street corners.(Mandel Ngan/Getty Images)
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