In this photo provided by the U.S. Navy, an FBI evidence response team vehicle is parked outside Building 197 at the Navy Yard in Washington as evidence is collected Wednesday, Sept. 18, 2013. A ... more 
In this photo provided by the U.S. Navy, an FBI evidence response team vehicle is parked outside Building 197 at the Navy Yard in Washington as evidence is collected Wednesday, Sept. 18, 2013. A gunman killed 12 people at the base on Monday, Sept. 16, 2013. (AP Photo/U.S. Navy, Mass Communication Specialist 2nd Class Pedro A. Rodriguez) less 
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Associated Press | Photo By U.S. Navy, Mass Communication Specialist 2nd Class Pedro A. Rodriguez
Wed, Sep 18, 2013 9:01 PM EDT