A man dies in the US after contracting the rarest form of anthrax. Robert Stevens, 63, died in Palm Beach, Florida, after contracting pulmonary anthrax.
The anthrax attacks eventually kill five people and leave 17 seriously ill. The weapons-grade anthrax was posted in letters to a number of people and institutions, including US broadcasters and Senate buildings.
Al-Qaeda is initially suspected of being behind the anthrax attacks. Iraq is also suspected. These are later discounted.