The guns, all WASR-10 762-caliber rifles, were traced earlier this week to the Lone Wolf gun shop in Glendale, Ariz., CBS News reported Thursday, citing Justice Department documents.
The controversial operation run by the Bureau of Alcohol, Tobacco and Firearms encouraged gun stores to sell massive numbers of weapons to suspected members of drug cartels in hopes of catching a major cartel leader.
The guns have been recovered at a number of crime scenes, including the murder of an Immigration and Customs Enforcement agent in 2011 and a Border Patrol officer in 2010.
Two of the three guns recovered this week were among 700 purchased by Uriel Patino, Fox News reported. The third was bought by Sean Steward, who was convicted of gun charges in 2012.
Justice officials have refused to turn over many documents concerning the program requested by Congress, resulting in Attorney General Eric Holder being held in contempt in 2012.
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