On that flight was Ahmad Ajaj, a Palestinian fresh from Afghanistan, whose suitcase bore bomb-making manuals.

One was found carrying a bomb-making manual made up of information gleaned from the Internet.

Ajaj was accused of bringing a bomb-making manual when he arrived in the United States September 1, 1992.

Experts can learn if the device was copied from a particular bomb-making manual or if it matches the design of bombs rebuilt previously and described in agency computers.

On that same flight in 1992 had been Ahmad Ajaj, a Palestinian fresh from Afghanistan, whose suitcase was full of bomb-making manuals.

"I mean, we'd get requests for bomb-making manuals."

Authorities identified him as a resident alien who had advocated the violent overthrow of the government and authored a bomb-making manual.

Three of the bomb-making manuals were promptly delivered to the address Mr. Livingstone had given, he said, no questions asked.

In a series of conversations Yousef openly discussed a way to retrieve the bomb-making manuals seized when Ajaj was arrested.

Some documents appear genuine, among them bomb-making manuals in Arabic, which have an asking price of $5,000.