furious" and why? we don't know. now the contempt citation newly drafted is specific we're told who is responsible for the cover-up, the so-called, post-february 4th documents. was it a few bad u.s. attorneys in arizona, an atf officials who lied to washington as alleged, or, did holder's own staff engineer a tightly-wound, air-tight story that isolated and exonerated the attorney general and his inner circle? >> when did you first know about the program officially i believe called "fast and furious"? >> not sure of the exact date but i probably heard about "fast and furious" for the first time over the last few weeks. >> reporter: now sources close to the investigation believe the documents, if they were in fact harmless as holder has described last night, that he would have released them. my sources however believe these documents risked opening a pandora's box. one document would lead to another.