The U.S. Department of Justice is looking into a flawed Milwaukee sting as part of a larger review into how agents handle certain sensitive cases.

DOJ Inspector General Michael Horowitz said he's concerned about how the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives is being managed. A Milwaukee Journal Sentinel report said Horowitz wrote to two Congress members saying his office will look into the agency's management.

The Milwaukee sting involved agents setting up a fake storefront to nab criminals selling guns and drugs. But agents lost guns and left behind sensitive documents, their store was burglarized and they refused to pay their rent.

Republican Reps. Jim Sensenbrenner of Wisconsin and Bob Goodlatte of Virginia have demanded that ATF release its internal report on the Milwaukee operation.