What's being investigated: Role of top five Abu Ghraib officers.

Inquiry conducted by the Army Inspector General, Lt. Gen. Stanley E. Green.

Prompted by the photographs of abuse at the prison.

What has been released: Nothing. Unnamed military officials described aspects of the report to the press in April 2005.

Sources: Reportedly, sworn statements from 37 senior officials, including L. Paul Bremer, formerly the Bush administration's top administrator in Iraq, as well as reviews of the military's previous inquiries.

Findings: According to CNN and other news sources, the Green Report cleared Lt. Gen Ricardo Sanchez, the commander of Abu Ghraib at the time of the abuses there, as well as his deputy, Major Gen. Walter Wojdakowski. The report also allegedly clears two of the other high-ranking officers at the prison: Maj. Gen. Barbara Fast, who oversaw Abu Ghraib's interrogation center, and Col. Marc Warren, the top legal officer. That leaves Brig. Gen. Janis Karpinski, the former commander of the prison's military police, as the highest-ranking officer to have been punished.

Context: Without giving details, the report mentions a Sept. 14, 2003, memo by Sanchez authorizing interrogation techniques. That memo, which was rescinded on Oct. 12, 2003, was made public by the ACLU at the end of March 2005. The tactics it allowed included "exploit[ing] Arab fear of dogs;" "sleep management" that entailed giving a detainee as little as four hours of sleep in 24 hours over a total period of 72 hours; yelling, loud music, and light control to "prolong capture shock;" and "stress positions" sitting, standing, kneeling, pronefor up to one hour each and for a total of four hours. At a hearing before the Senate Armed Services Committee in May 2004, Sen. Jack Reed, a Democrat from Rhode Island, asked Sanchez whether he "ordered or approved the use of sleep deprivation, intimidation by guard dogs, excessive noise and inducing fear as an interrogation method" at Abu Ghraib. Sanchez answered about the time period at issue, "I never approved any of those measures."