In Clifton, the digital images and terrorist manuals from Abu al-Bukhary's site resided, like data from thousands of other Internet pages hosted at Fortress ITX, inside a sprawling computer room.

The CIA used a terrorist manual found in Manchester to help justify their use of techniques such as water boarding, it has been claimed.

The police said they found terrorist manuals and a receipt for 1,440 rounds of rifle ammunition at Mr. Nosair's home in Cliffside Park, N.J., and a vial of poison in his locker at the State Supreme Court building at 111 Centre Street, where he was employed as an air-conditioning and heat technician.

Projects based on Mr. bin Laden's speeches and writing already in the works include a book based on a terrorist manual from his Al Qaeda organization and a Web site showing an Al Qaeda recruitment film along with scholarly commentary.

In early 1999, Hijazi and Abu Hoshar contacted Khalil Deek, an American citizen and an associate of Abu Zubaydah who lived in Peshawar, Pakistan, and who, with Afghanistan-based extremists, had created an electronic version of a terrorist manual, the Encyclopedia of Jihad.

The report quoted a terrorist manual as saying, "An undercover member should have a general appearance that does not include Islamic orientation, such as a beard, toothpick, long shirt or small Koran."

In 2004, he published a "terrorist manual" entitled The Base of the Vanguard, an Arabic pun on the phrases al-Qaeda ("the base") and the Vanguards of Conquest.

They bore little similarity to the other terrorist manuals recovered at al-Qaeda safe houses throughout Afghanistan and Pakistan, which in comparison were extremely crude.

Other terrorist manuals have been uncovered over the years, and even introduced at previous trials.

An American counterterrorism official said the CIA and MI5 suspect that Begg worked with Deek to create a CD-ROM of a terrorist manual, Encyclopedia of Jihad.