U.S. author and terrorism expert Martin Keating said Wednesday that the United States must build a stronger human intelligence network after the failure of intelligence-gathering networks in preventing the Sept. 11 terrorist attacks in the U.S.

The U.S. must also establish effective predictive analysis and threat-removal measures, Keating said at a professional luncheon at the Foreign Correspondents Club of Japan.

The terrorist attacks in the U.S. last year constituted a "failure of imagination" on the part of U.S. threat analysts and a "lack of timely, effective predictive analysis," he said.

In "The Final Jihad," Keating's terrorist suspense novel published in 1996 and based on intelligence information, he said that a well-trained, well-organized terrorist group could attack the U.S.

His piece of fiction "turned out to be anything but," he said.