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http://www.9-11commission.gov/report/911Report_Ch4.htm

Ever since March 1995, American officials had had in the backs of their minds Aum Shinrikyo's release of sarin nerve gas in the Tokyo subway. President Clinton himself had expressed great concern about chemical and biological terrorism in the United States. Bin Ladin had reportedly been heard to speak of wanting a "Hiroshima" and at least 10,000 casualties. The CIA reported that a soil sample from the vicinity of the al Shifa plant had tested positive for EMPTA, a precursor chemical for VX, a nerve gas whose lone use was for mass killing. Two days before the embassy bombings, Clarke's staff wrote that Bin Ladin "has invested in and almost certainly has access to VX produced at a plant in Sudan."43 Senior State Department officials believed that they had received a similar verdict independently, though they and Clarke's staff were probably relying on the same report. Mary McCarthy, the NSC senior director responsible for intelligence programs, initially cautioned Berger that the "bottom line" was that "we will need much better intelligence on this facility before we seriously consider any options." She added that the link between Bin Ladin and al Shifa was "rather uncertain at this point." Berger has told us that he thought about what might happen if the decision went against hitting al Shifa, and nerve gas was used in a New York subway two weeks later.44