More than 100,000 pages of newly released government documents demonstrate how US military interrogators "abused, tortured or killed" scores of prisoners rounded up since Sept. 11, 2001, including some who were not even suspected of having terrorist ties, according to a just-published book.

In Administration of Torture, two American Civil Liberties Union attorneys detail the findings of a years-long investigation and court battle with the administration that resulted in the release of massive amounts of data on prisoner treatment and the deaths of US-held prisoners.

"[T]he documents show unambiguously that the administration has adopted some of the methods of the most tyrannical regimes," write Jameel Jaffer and Amrit Singh. "Documents from Guantanamo describe prisoners shackled in excruciating 'stress positions,' held in freezing-cold cells, forcibly stripped, hooded, terrorized with military dogs, and deprived of human contact for months."

Most of the documents on which Administration of Torture is based were obtained as a result of ongoing legal fights over a Freedom of Information Act request filed in October 2003 by the ACLU and other human rights and anti-war groups, the ACLU said in a news release.

The documents show that prisoner abuse like that found at Abu Ghraib prison in Iraq was hardly the isolated incident that the Bush administration or US military claimed it was. By the time the prisoner abuse story broke in mid-2004 the Army knew of at least 62 other allegations of abuse at different prisons in Iraq and Afghanistan, the authors report.

Drawing almost exclusively from the documents, the authors say there is a stark contrast between the public statements of President Bush and then-Defense Secretary Donald Rumsfeld and the policies those and others in the administration were advocating behind the scenes.

President Bush gave "marching orders" to Gen. Michael Dunlavey, who asked the Pentagon to approve harsher interrogation methods at Guantanamo, the general claims in documents reported in the book.

The ACLU also found that an Army investigator reported Rumsfeld was "personally involved" in overseeing the interrogation of a Guantanamo prisoner Mohammed al Qahtani. The prisoner was forced to parade naked in front of female interrogators wearing women's underwear on his head and was led around on a leash while being forced to perform dog tricks.

"It is imperative that senior officials who authorized, endorsed, or tolerated the abuse and torture of prisoners be held accountable," Jaffer and Singh write, "not only as a matter of elemental justice, but to ensure that the same crimes are not perpetrated again."