Two police officers walk down M st. outside of the Navy Yard. Recreation centers and parks in the area also closed as police, reporters and onlookers snarled traffic. (Andrew S Geraci/The Washington Times)

Two police officers walk down M st. outside of the Navy Yard. Recreation centers and parks in the area also closed as police, reporters and onlookers snarled traffic. (Andrew S Geraci/The Washington Times)