Technology Review - Al Qaeda's Anthrax

October 5 may not be as famous as September 11, but it may prove more historic and seminal. On that day last year the United States suffered its first death ever from a biological warfare attack. Over the following two months, 21 additional people were infected with anthrax, and four of them died. We don't know who planned the attack or who perpetrated it, where they obtained the anthrax or why it was done. The delivery weapon was the U.S. mail, although even that isn't certain for all the deaths. The World Trade Center attacks are clear and well-understood, compared to the anthrax mystery. ...

... Judging from such factors as the timing of the anthrax mailings, the delivery method, the quantity of spores used and the information that was publicly available about anthrax's lethality, I think it likely that the anthrax terrorists were working for Osama bin Laden, and intended to murder thousands of people. ...

Makes for chilling reading, in that quiet manner of detached analysis.