MGN Online

Published: Sep 26, 2013 4:58 PM EDT

WASHINGTON (AP) - The Navy is ordering an in-depth investigation into the Washington Navy Yard shooting and the events that led up to it, including a detailed look at the shooter, his mental health background and whether any adverse information was ever reported to the service about him.
    
Navy Secretary Ray Mabus (MAY'-buhs) outlined the order in a memo describing what will be a parallel investigation to the FBI's criminal probe. Mabus asked Adm. John Richardson to conduct the investigation, including an evaluation of the Navy's response to the shooting. The memo was obtained Thursday by The Associated Press.
    
Questions remain about whether the contractor that employed Aaron Alexis warned the military of concerns about his mental stability. Alexis gunned down 12 people at the Navy Yard. He was killed by police.

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