· The perpetrator was probably ready before Sept. 11 and simply took advantage of the likelihood that Sept. 11 would throw suspicion on Muslim terrorists. Was the perpetrator trying to push the US toward some retaliatory military action?

· The perpetrator must have realized in advance that the anthrax attack would result in the strengthening of US defense and response capabilities. This is not likely to have been a goal of anti-American terrorists, who would also be unlikely to warn the victims in advance. Perhaps the perpetrator stood to gain in some way from increased funding and recognition for biodefense programs. Financial beneficiaries would include the BioPort Corp., the source of the US anthrax vaccine, and other potential vaccine contractors.

· Expert analysts for the FBI believe that the letters were written by a Westerner, not a Middle Easterner or Muslim, although the text was clearly intended to imply the latter.

· The choice of a variety of media as targets seems to have been cleverly designed to ensure a broad spectrum of publicity about the attacks. The choice of Senators Daschle and Leahy suggests that the perpetrator may lean to the political right and may have some specific grudge against those Senators.

· The perpetrator successfully covered every personal trace when he prepared and mailed the letters, which suggests that he had forensic training or experience.