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Now members of Congress who have spent months scrutinizing the Fast and Furious debacle are seeking to determine whether White Gun was another weapons investigation gone wrong.

"Apparently guns got away again," said one source close to the investigation, led by Rep. Darrell Issa (R-Vista) and Sen. Charles E. Grassley (R-Iowa). "How many got into Mexico, who knows?"

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Officials from the Bureau of Alcohol, Tobacco, Firearms and Explosives declined to comment on whether any firearms were lost in White Gun

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In fall 2009, the ATF team sent an undercover agent posing as an arms dealer to Guzman Patino. Photos of weapons, including a Dragon Fire 120-millimeter heavy mortar, ....

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A second case involved cartel members who were seeking shoulder-launched antiaircraft missiles and antitank rockets, according to the ATF records.

The same undercover agent met the pair in February 2010 at a Phoenix warehouse. David Diaz-Sosa and Jorge DeJesus-Casteneda brought 11 pounds of crystal methamphetamine to trade for weapons. The undercover agent showed them shoulder-launched missiles, rocket launchers and grenades before ATF agents moved in and arrested them.
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By that summer, MacAllister had gone to Mexico City to check the police and military vaults. The ATF documents don't detail what she found, ...