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Updated: January 2006
FBI investigators believe four letters were sent. Contaminated letters sent to the New York Post and NBC’s Tom Brokaw had a September 18, 2001, postmark. Letters to Senator Tom Daschle and Senator Patrick Leahy—postmarked October 9—carried a more potent form of anthrax. There were also confirmed anthrax cases at American Media, in Florida, and at the New York offices of CBS and ABC, though FBI investigators do not believe letters were sent to these offices.
Twenty-three, according to the Centers for Disease Control and Prevention (CDC).
Five.
Yes. Of the people who contracted anthrax, eleven worked for the postal service and eight for media organizations. (An infant visiting her mother at ABC News in New York also fell ill.) Three other people—a bookkeeper in New Jersey, a nurse in New York City, and an elderly widow in rural Connecticut—also caught anthrax. The nurse and the widow died.
Probably through mail that crossed paths with an anthrax-contaminated letter, according to government investigators. Anthrax spores were found in the New Jersey bookkeeper’s mailroom. In the other two cases, no trace of anthrax was found in their mail, their homes, or anywhere they had visited before falling ill. According to postal records, however, letters headed for their neighborhoods passed through the same sorting machine as those sent to the senators, and at around the same time.
It is not entirely clear, but if small spores have their electrostatic charge altered so they disperse more readily—as was the case with the anthrax spores in the letters sent to the senators—they could leak out of a sealed envelope. Sorting machines may have stirred up the spores as the letters moved through.
An FBI handwriting analysis indicates that the four letters and envelopes found thus far were written by one person.
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