2001: Two more anthrax letters in the 2001 attacks are mailed from Trenton, N.J. Unlike the first mailings on Sept. 18, 2001, which targeted the news media, the second letters were addressed to Democratic Sens. Tom Daschle and Patrick Leahy. The letters containing anthrax spores would end up killing five people and infecting 17 others. Federal prosecutors in August 2008 named scientist Bruce Edwards Ivins, who had committed suicide a month earlier, the sole culprit in the crime.