Fast and Furious: Eric Holder cleared but 14 faulted
The US justice department has cited 14 people for possible disciplinary action for their roles in a botched gun-running operation.
Operation Fast and Furious saw US agents lose track of hundreds of illegal guns sold in Arizona and allowed into Mexico to target dealers.
The inspector general's 471-page reportcomes after a 19-month review.
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In June Mr Holder became the first sitting attorney general to be held in contempt of Congress. He faced proceedings after the House Oversight Committee led its own investigation into operation.
Mr Breuer was criticised for not alerting his superiors in 2010 to flaws in a similar programme, known as Operation Wide Receiver, which started under former President George W Bush.
The US justice department has cited 14 people for possible disciplinary action for their roles in a botched gun-running operation.