U.S. Shooter 'Acted Alone' - Presented by: The Aol. On Network

A small group of people gathered at Freedom Plaza in Washington D.C. to mourn the victims of the Navy Yard shooting. Twelve people plus the suspected gunman were killed during Monday's bloody spree. Eight more were injured, three of them suffered gunshot wounds. The FBI identified the suspect as Navy contractor Aaron Alexis. Washington Metropolitan Police Chief Cathy Lanier says they're now convinced no second suspect was involved and the gunman acted alone.

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