Video - National News
Posted on September 16, 2013 at 9:41 PM
Updated Monday, Sep 16 at 10:54 PM
At a late night news conference, law enforcement officials said they were confident that Aaron Alexis acted alone in Monday's shooting rampage at the Washington Navy Yard that left 13 people dead, including Alexis.
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Credit: Katrina Gutierrez / WFAA