WASHINGTON — The former Navy reservist who killed 12 people at the Washington Navy Yard had been hearing voices and was undergoing treatment in the weeks before the shooting rampage, but was not stripped of his security clearance, officials said Tuesday.
Aaron Alexis, a 34-year-old information technology employee with a defense contractor, used a valid pass to get into the highly secured installation Monday morning and started firing inside a building, the FBI said. He was killed in a gun battle with police.
The motive for the mass shooting — the deadliest on a military installation in the U.S. since the attack at Fort Hood, Texas, in 2009 — was a mystery, investigators said.
U.S. law enforcement officials told The Associated Press that there was no known connection to terrorism and that investigators have found no manifesto or other writings suggesting a political or religious motive.
Alexis had been suffering a host of serious mental problems, including paranoia and a sleep disorder, and had been hearing voices in his head, according to the officials, who spoke on condition of anonymity because the criminal investigation was still going on.
He had been treated since August by Veterans Affairs, the officials said.
The Navy had not declared him mentally unfit, which would have rescinded a security clearance Alexis had from his earlier time in the Navy Reserve.
The assault is likely to raise more questions about the adequacy of the background checks done on contract employees and others who are issued security clearances — an issue that came up most recently with National Security Agency leaker Edward Snowden, an IT employee with a government contractor.
Navy Secretary Ray Mabus ordered two security reviews Tuesday to look at how well the Navy protects its bases and how accurately it screens its workers. A senior defense official also said Defense Secretary Chuck Hagel intends to order a review of physical security and access at all department installations worldwide.
In the hours after the Navy Yard attack, a profile of Alexis began coming into focus.
A Buddhist convert who had also had flare-ups of rage, Alexis, a black man who grew up in New York City and whose last known address was in Fort Worth, Texas, complained about the Navy and being a victim of discrimination. He also had run-ins with the law over shootings in 2004 and 2010 in Texas and Seattle, and was ticketed for disorderly conduct after being thrown out of a metro Atlanta nightclub in 2008.
Alexis' bouts of insubordination, disorderly conduct and being absent from work without authorization prompted the Navy to grant him an early — but honorable — discharge in 2011 after nearly four years as a full-time reservist, authorities said. During his service, he repaired aircraft electrical systems at Fort Worth.
In addition to those killed at the Navy Yard attack, eight people were hurt, including three who were shot and wounded, authorities said. Those three were a police officer and two female civilians. They were all expected to survive.
The dead ranged in age from 46 to 73, officials said. A number of the victims were civilian employees and contractors, rather than active-duty military personnel.
Those killed included: Michael Arnold, 59, a Navy veteran and avid pilot who was building a light airplane at his home; Sylvia Frasier, 53, who worked in computer security; Kathleen Gaarde, 63, a financial analyst; and Frank Kohler, 50, a former president of the Rotary Club in Lexington Park, Md., who proudly reigned as "King Oyster" at the region's annual seafood festival.
Monday's onslaught at a single building at the Navy Yard unfolded about 8:20 a.m. in the heart of the nation's capital, less than four miles from the White House and two miles from the Capitol. It put all of Washington on edge.
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