Two of the AK's sold to the drug dealers by the ATF were found next to the dead body of Border Patrol Agent Brian Terry. Mr. Terry was killed on December 15, 2010.
http://www.odmp.org/officer/20596-border-patrol-agent-brian-a.-terry
The ATF claims the sale of assault rifles to the Mexican drug cartels was part of a sting operation. The ATF is now accused of with holding documents from a House Oversight committee.
ATF Sold Assault Rifles to Mexican Drug Cartels
Fatboy sez: What. Me Worry?