When a truck bomb exploded in an underground parking garage, killing six people, injuring hundreds more and upending daily life in New York, it seemed as if the worst conceivable act of terrorism had been committed. But it turned out to be no more than an awful prelude. "Unfortunately, our calculations were not very accurate this time," one of the 1993 conspirators, Nidal A. Ayyad, was said to have written (in slightly broken sentences) not long after the bombing. "However, we promise you that next time it will be very precise and WTC will continue to one our targets in the U.S." More.
Accounting for 2/26 in a 9/11 Exhibition