The anthrax attacks of 2001 began one week after the September 11th attacks. Letters containing anthrax spores were mailed to several news media offices in New York City. One letter was also sent to American Media Inc. in Florida. The anthrax caused the death of Robert Stevens. Later in October, letters were sent to Senators Tom Daschle and Patrick Leahy, shutting down some government mail operations. The anthrax in the letters sent to the senators was a powdery form that could be inhaled, unlike the first letters. The attacks led to widespread paranoia and investigations but the perpetrator was never determined.