Editor's note: The Washington Navy Yard was the scene of a 2013 shooting in which military contractor Aaron Alexis killed 12 civilian workers before he was fatally shot by police. It was later disclosed that the firm which performed Alexis' background check knew he lied about a 2004 arrest, but granted him clearance anyway. This led to Justice Department and Congressional reviews of safety at government facilities, and suspected fraud in granting of clearances. - Tricia
Rep. Darrell Issa, R-Calif., responds to Department of Defense report after Washing Navy Yard shooting; says findings concur with Oversight and Government Reform Committee report - statement via @NBCNews
Florida family of woman killed in the Washington Navy Yard shooting files 1st lawsuit against the government and defense contractors, alleging officials ignored red flags about the killer's deteriorating mental health - @AP
Company that employed the Washington Navy Yard shooter withdrew his access to classified material for 2 days when mental health problems became evident, but restored it quickly and never told the Navy about the incident - @AP
The Washington Navy Yard shooting occurred on September 16, 2013, when lone gunman Aaron Alexis, 34, fatally shot twelve people and injured three others in a mass shooting at the headquarters of the Naval Sea Systems Command (NAVSEA) inside the Washington Navy Yard in Southeast Washington, D.C. The attack, which took place in the Navy Yard's Building 197, began around 8:20 a.m. EDT and ended when Alexis was killed by police around 9:20 a.m. EDT.
It was the second-deadliest mass murder on a U.S. military base, behind only the Fort Hood shooting in November 2009.