Anthrax-laced letter, which was sent to the Senate Majority Leader Tom Daschle.

Tom DaschleFBI
The FBI is trying to determine if this inhalation anthrax-laced letter sent to Senate Majority Leader Tom Daschle could have exposed 13 postal employees in Washington, D.C., plus 28 in and near Daschle's office. The envelope is postmarked Oct. 8 from Trenton, N.J. AP / FBI
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