By Paul Floyd Much of the investigation into the deadly Sept. 16 shooting at the Washington Navy Yard will focus on the background of shooter Aaron Alexis to uncover any missed red flags that could have prevented the attack. Alexis brought at least one firearm onto the post, which serves as a home for the chief of naval operations and various other command headquarters throughout the Navy and Marine Corps, and opened fire, ultimately wounding eight and killing 12 before being shot down by responding security personnel. The death toll makes this incident the second-deadliest military installation shooting in U.S. history after the Fort Hood shooting perpetrated by U.S. Army Maj. Nidal Malik Hasan in 2009. In a city overlaid with multiple law enforcement agencies and overlapping jurisdictions, the FBI quickly assumed the lead in the investigation, taking the case away from the U.S. Naval Criminal Investigative Service. This suggests terrorism was suspected and has not been entirely ruled
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