This photo taken Jan. 23, 2013 shows Charles Houser, Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), chief, National Trace Center speaking in his office in Martinsburg, W.Va. (AP Photo/Cliff Owen)

Associated Press
This photo taken Jan. 23, 2013 shows Charles Houser, Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), chief, National Trace Center speaking in his office in Martinsburg, W.Va. (AP Photo/Cliff Owen)
This photo taken Jan. 23, 2013 shows Charles Houser, Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), chief, National Trace Center speaking in his office in Martinsburg, W.Va. (AP Photo/Cliff Owen)
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