Police block off the M Street, SE, as they respond to a shooting at the Washington Navy Yard in Washington, September 16, 2013. The U.S. Navy said several people were injured and there were possible fatalities in the shooting at the Navy Yard in Washington D.C. on Monday. The Navy did not immediately provide additional details but a Washington police spokesman said earlier that five people had been shot, including a District of Columbia police officer and one other law enforcement officer. REUTERS/Joshua Roberts