Able Danger: what the Pentagon doesn't want you to know abou 9/11

The Pentagon has burned 9,500 copies of Army Reserve Lt. Col. Anthony Shaffer's memoir "Operation Dark Heart," his book about going undercover in Afghanistan.

"Fox News has obtained an unredacted copy of the IG report containing the names of witnesses, who backed up Shaffer's story when contacted for comment..."

The U.S. Army originally cleared the book for release.

The U.S. Defense Intelligence Agency attempted to block the book about the tipping point in Afghanistan and a controversial pre-9/11 data mining project called "Able Danger."

In a letter obtained by Fox News, the DIA says national security could be breached if "Operation Dark Heart" is published in its current form. The agency also attempted to block key portions of the book that claim "Able Danger" successfully identified hijacker Mohammed Atta as a threat to the United States before the Sept. 11, 2001, terror attacks.

Pentagon Destroys Copies of Controversial Memoir Written by Army Officer