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U.S. Defense Secretary Chuck Hagel has ordered a security review of U.S. military facilities worldwide following the mass killings at the Washington Navy Yard this week.
Hagel said warning signs about the shooter Aaron Alexis were missed, including his mental illness and legal problems.
"When you go back in hindsight there were some red flags, of course there were, and sure, should we have picked him up - why didn't we - how could we have - all those questions need to be answered," said Secretary Hagel.
Alexis, a former Navy reservist and military contractor, shot 12 people before he was shot dead by police Monday at the Navy facility.
More: Hagel Demands Security Review After Navy Yard Shooting