In the late summer of 2010, the ATF agent leading the failed Fast and Furious gun-smuggling operation in Arizona flew to Mexico City to help coordinate cross-border investigations of U.S. weapons used by Mexican drug cartels.

Hope A. MacAllister wanted access to police and military vaults for American weapons recovered by Mexican authorities in raids and at crime scenes. She especially was interested in firearms from another ATF investigation, code-named White Gun, that she was running.

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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