Eric Holder calls "gunwalking" unacceptable, regrets tactic as part of Fast and Furious

Attorney General Eric Holder answers questions on Operation "Fast and Furious" at a Senate Judiciary Committee oversight hearing, November 8, 2011.

WASHINGTON - Attorney General Eric Holder Tuesday acknowledged that an agency under his supervision, ATF, intentionally let weapons fall into the hands of Mexican drug cartels.

Watch Attkisson's full report below.

It's a controversial practice called "gunwalking" that tried to get big fish criminals. Instead, it put thousands of guns on the street. Many were used in violent crimes and murders.

CBS News investigative correspondent Sharyl Attkisson report Holder made the difficult admission to Congress. "Any instance of so-called gunwalking is unacceptable. Regrettably, this tactic was used as part of Fast and Furious."

That also means the letter Holder's office sent Congress last February denying gunwalking was wrong.

Holder regrets death of federal agent

"What I said was it contains inaccurate information," Holder told Sen. John Cornyn (R-TX).

"Well, isn't that false," Cornyn asked.

"Well false, I don't want to quibble with you," Holder replied. "But false I think implied people making a decision to decieve.

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    Sharyl Attkisson is a CBS News investigative correspondent based in Washington.

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