The US Defense Intelligence Agency (DIA) tried to block a book giving details of a project which identified the 9/11 plotter well before the hijack of the plane used in the attack, a media report said.
According to Fox News, it has obtained a letter in which the DIA says that 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 US before the Sep 11, 2001, terror attacks.
Atta was the alleged ring leader of the September 11 hijackers and piloted American Airlines Flight 11 into the World Trade Center.
The US defence department is now negotiating with the publisher, St. Martin's Press, to buy all 10,000 copies of the book to keep it off shelves — even after the US Army had cleared the book for release, the report said.
Specifically, the DIA wanted references to a meeting between
Lt. Col. Tony Shaffer, the book's author, and the executive director of the 9/11 Commission, Philip Zelikow, removed. In that meeting Shaffer alleges the commission was told about "Able Danger" and the identification of Atta before the attacks. No mention of this was made in the final 9/11 report.