Timeline: How The Anthrax Terror Unfolded
Seven days after the terrorist attacks of Sept. 11, 2001 attacks, anonymous letters laced with deadly anthrax spores began arriving at media companies and congressional offices. Here, a chronology of who was infected and the FBI's pursuit of the attacker.
Source: http://www.npr.org/2011/02/15/93170200/timeline-how-the-anthrax-terror-unfolded?ft=1&f=1003