The CDC learned of a domestic terrorism attack via anthrax sent through the mail

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On Sept. 11, 2001, the U.S. Centers for Disease Control and Prevention (CDC) learned of a domestic terrorism attack via inhalational anthrax sent through the U.S. Postal Service (USPS) mail.

The attacks resulted in 22 cases of anthrax—eleven inhalational and eleven cutaneous—five of which were fatal.  A total of 21 USPS facilities were contaminated in the attacks, and 32,000 potentially exposed persons initiated post-exposure prophylaxis.

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Source: U.S. Department of Justice
Credit: PDF: Anthrax 2001: Observations on the Medical and Public Health Response.