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      Obama orders security review after shooting

      The secretary of the Navy is ordering a pair of security reviews -- focusing on how well the Navy protects its bases, and how accurately it screens its workers.

      And President Barack Obama is ordering a review of security standards for contractors and employees across federal agencies.

      The reviews follow yesterday's shooting rampage at the Washington Navy Yard by a gunman who killed 12 people before dying in an exchange of fire with police.

      Officials say Aaron Alexis had been hearing voices and had been undergoing treatment for mental problems including paranoia in recent weeks, but he still kept his security clearance.