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Congressional investigators back in Arizona for "Gunwalker"

ATF seal over rifles and handguns
CBS/AP
ATF seal over rifles and handguns
CBS/AP

Congressional investigators are back on the ground in Phoenix this week for more interviews in the ATF "gunwalking" investigation. This time, sources tell CBS News, the investigators will be speaking with gun shop owners the ATF allegedly recruited to play a part in Operation Fast and Furious.

In that operation, insiders allege ATF allowed more than 2,500 assault rifles and other weapons to hit the streets or "walk." The idea was allegedly to monitor the purchases of gun buyers suspected of working with Mexican drug cartels, in hopes it would eventually provide intelligence to take down a cartel. But some of the weapons have been used in violent crimes, including the scene of the murder of border patrol agent Brian Terry last December.

The owners of Arizona gun shops "J&G Gun Sales" and "Lone Wolf" are said to be on the list of those to be questioned this week by representatives from Sen. Charles Grassley's (R-Iowa) office and Rep. Darrell Issa's (R-CA) office. Democrats on the House Oversight Committee also have representation on site.

Inan earlier story, CBS News reported on documents that show one gun shop owner told ATF back in 2010 that he was worried what would happen if the guns he sold ended up in the wrong hands. But ATF allegedly encouraged him and other gun shop owners to continue the sales over the course of many months.

Attorney General Eric Holder has asked for the Inspector General to investigate. Members of Congress are investigating separately.

  • Sharyl Attkisson On Twitter»

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