· Chronology: Analytical data on the anthrax in the letters became available to investigators in late October, 2001. The FBI then began questioning former government scientists. On 31 Oct. it was reported that the US rejected a UN resolution offered by France to condemn the anthrax attack, on the grounds that it could have been domestic terrorism. On 9 Nov. the FBI released a profile of the perpetrator as a lone, male domestic terrorist, obviously one with a scientific background and laboratory experience who could handle hazardous materials. In early Dec. the FBI said it was investigating government and contractor labs possessing the Ames strain, and individuals who had access to them. On 16 Dec. the FBI said it was focusing on a contractor that worked with the CIA. At about the same time the FBI said it was interested in non-military individuals who had received the anthrax vaccine.

· John Bolton, Under Secretary of State for Arms Control and International Security, said on 19 Nov. that “We don’t know…at the moment, in a way that we could make public, where the anthrax attacks came from.” Senate Majority Leader Thomas Daschle, recipient of one of the anthrax letters and in frequent contact with investigators, said on 8 Dec. that the perpetrator was probably someone with a military background. Ari Fleischer, the White House spokesman, said on 17 Dec. that it is increasingly "looking like it was a domestic source."

· After a series of uncontrolled statements to the media, relevant experts have been asked to keep quiet and, in some cases, appear to have been asked to "correct" former statements.