http://www.fbi.gov/pressrel/speeches/speech041902.htm Robert S. Mueller, III, Director, FBI
Commonwealth Club of California
San Francisco, CA
April 19, 2002
<snip>The plans were hatched and financed overseas, beginning at least five years ago, but perhaps going back even further. Each of the hijackers came from abroad: 15 from Saudi Arabia, two from the United Arab Emirates, and one each from Lebanon and Egypt. All 19 entered our country legally, and only three had overstayed the legal limits of their visas on the day of the attacks.
While here, the hijackers did all they could to stay below our radar. They contacted no known terrorist sympathizers. They committed no egregious crimes. They blended into the woodwork.
The hijackers also apparently left no paper trail. In our investigation, we have not yet uncovered a single piece of paper –– either here in the U.S. or in the treasure trove of information that has turned up in Afghanistan and elsewhere –– that mentioned any aspect of the September 11th plot. As best we can determine, the actual hijackers had no computers, no laptops, no storage media of any kind. They used hundreds of different pay phones and cell phones, often with prepaid calling cards that are extremely difficult to trace. And they made sure that all the money sent to them to fund their attacks was wired in small amounts to avoid detection.
In short, the terrorists managed to exploit loopholes and vulnerabilities in our systems, to stay out of sight, and to not let anyone know what they were up to beyond a very closed circle. The patient, skilled and exploitive approach used by the hijackers means our prevention efforts must be massive, globally collaborative and supported by ample technology and analytical capacity. It means that the information possessed by every agency - - both here and abroad, both federal and local - - must go into the multi-agency prevention mix and be acted upon.