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Aaron Alexis,34, is the contractor the FBI has identified as a suspect in the mass shooting at the Washington Navy Yard Sept. 16, 2013.

Aaron Alexis,34, is the contractor the FBI has identified as a suspect in the mass shooting at the Washington Navy Yard Sept. 16, 2013.

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Navy Yard: Could it have been prevented?

Expert: Truck bombs and conspiracies are easier to stop; lone wolfs harder

While significant details about the mass shooting at the Washington Navy Yard on Monday remain obscure, as with every such incident, the first question that people want answered is this: Could something have been done to save those innocent lives?