In November 2009, U.S. Army major Nidal Malik Hasan killed 13 fellow soldiers and injured 30 in the Fort Hood shooting in Killeen, Texas. While the act was called terrorism by some due to Hasan's Muslim heritage, the attack was ruled out by the FBI to have been perpetrated by a terrorist organization. On September 16, 2013, another mass murder on a U.S. military base surpassed the incident when a former navy reservist fired a shotgun at the Washington Navy Yard Shooting, killing 12 civilian contractors and injured four more at the headquarters of the Naval Sea Systems Command (NAVSEA) in Southeast Washington, D.C.