The Justice Department's inspector general says he is conducting a four-city examination into storefront undercover operations run by the Bureau of Alcohol, Tobacco, Firearms and Explosives to assess whether they pose a danger to the public.

The ATF runs sting operations in various cities in an effort to catch arms traffickers who bring stolen weapons into storefronts where agents act as buyers.    

The IG's office says it is looking into storefront operations in Milwaukee, St. Louis, Pensacola, Fla., and Wichita, Kan.

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