I would like to appeal to the talented men and women of the American Society for Microbiology to assist the FBI in identifying the person who mailed these letters. It is very likely that one or more of you know this individual. A review of the information-to-date in this matter leads investigators to believe that a single person is most likely responsible for these mailings. This person is experienced working in a laboratory. Based on his or her selection of the Ames strain of Bacillus anthracis one would expect that this individual has or had legitimate access to select biological agents at some time. This person has the technical knowledge and/or expertise to produce a highly refined and deadly product. This person has exhibited a clear, rational thought process and appears to be very organized in the production and mailing of these letters.

The perpetrator might be described as "stand-offish" and likely prefers to work in isolation as opposed to a group/team setting. It is possible this person used off-hours in a laboratory or may have even established an improvised or concealed facility comprised of sufficient equipment to produce the anthrax.
It is important to ensure that all relevant information, no matter how insignificant it may seem, is brought to the attention of the investigators in this case. If you believe that you have information that might assist in the identification of this individual, please contact the FBI via telephone at 1-800-CRIME TV (1-800-274-6388) or via email at the following website: Amerithrax@FBI.gov