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Reports on investigations into the source of anthrax sent via mail in the United States. Investigation by the U.S. Federal Bureau of Investigation (FBI) into laboratories capable of producing the bacteria; How investigations into the specific strain of the anthrax bacteria could lead to a source.

Reports on investigations into anthrax mailed in letters in the United States. Efforts to solve the mystery of where the anthrax came from that killed an elderly woman in Connecticut who had no apparent connection to a post office or media business; Investigation methods, including interviews, analysis of immigrant records, and laboratory work; Details on clues found by investigators.

Reports that tests showing a genetic link between the anthrax used in an Army program and the series of anthrax attacks in the United States has advanced the domestic-terrorism theory.

Focuses on the profile of the anthrax perpetrator that was released by the United States Federal Bureau of Investigation (FBI). Focus on a reclusive, science-minded criminal; Similarities to Theodore Kaczynski, the so-called Unabomber; Brief details of the FBI investigation; Why mounting evidence has made the lone domestic terrorist the leading theory; Background on the anthrax scare; Clues which came from the anthrax letters; Comments of experts; Continued hunt for an al Qaeda link.