"Just to let everyone know, the only people who need to be in this line to be swabbed and tested are the people who have worked or have been in the area of the 8th floor of the south eastern corridor."
8. Hazmat teams going in to US Capitol building
9. Hazmat team members being hosed down
ABC - No Access North America/Internet
FILE: Boca Raton, Florida -11 October 2001
10. Pan of exterior of Post Office in Boca Raton
11. STILL photograph of Bob Stevens, victim of anthrax poisoning
12. Zoom in to microscopic STILL image of anthrax virus
13. Various of Hazmat crew and FBI agents preparing to go into American Media building
FILE: Washington, DC - 16 October 2001
14. So-called "anthrax letter" mailed to Senator Tom Daschle
15. Close up view of frank on envelope to Tom Brokaw
16. Envelope with address for Senator Daschle
FILE: Alexandria, Virginia - April 26 2002
17. Steven Hatfill standing outside lawyers office
Washington, DC - 1 August 2008
18. Exterior of Brentwood Post Office and processing centre
19. Close view of sign at post office - with names of the two victims
20. SOUNDBITE: (English) Gary Anderson, Retired Postal Worker:
"In one respect, it's nice and clean and over with, but on another respect you'd like to know a little more about what was going on in this guy's head with respect to the fact that, I understand he was aiming for the people in Congress, but he affected a whole lot of other people."
21. Exterior of Brentwood Post Office
ABC - No Access North America/Internet
FILE: Washington, DC - 17 October 2001
22. Hazmat crews outside Brentwood Processing centre
An Army scientist killed himself as federal prosecutors readied an indictment alleging he mailed anthrax-laced letters in 2001 in what U.S. authorities said on Friday may have been a bizarre attempt to test a vaccine for the deadly poison.
The developments marked an unexpected turn in an episode that rattled the United States, shaken only a few weeks earlier by the attacks of September 11, 2001.
Letters containing anthrax powder turned up at congressional offices, newsrooms and elsewhere, killing five and sending numerous victims to hospitals with anthrax poisoning.
One retired postal worker gave his reaction to the scientist, Bruce E. Ivins' death.
"In one respect, it's nice and clean and over with, but on another respect you'd like to know a little more about what was going on in this guy's head," Gary Anderson said.
Ivins worked at the Army's biodefence labs at near Washington for 18 years and had a long history of homicidal threats, according to papers recently filed in local court by a social worker.
Ivins' lawyer asserted the scientist's innocence and said he had been cooperating with investigators for more
than a year.
For more than a decade, Ivins worked to develop an anthrax vaccine that was effective even in cases where different strains of anthrax were mixed, which made vaccines ineffective, according to federal documents reviewed by the AP.
Several U.S. officials, all of whom discussed the ongoing investigation on condition of anonymity because they were not authorised to speak to the media, said prosecutors were closing in on the 62-year-old Ivins for the 2001 anthrax attacks.
Authorities had been investigating whether the anthrax was released to test new drugs. They were planning an
indictment that would have sought the death penalty for the attacks, officials said.
The Justice Department has not yet decided whether to close the investigation, officials said, meaning authorities are still not certain whether Ivins acted alone or had help.
One official close to the case said that decision was expected within days. If the case is closed soon, one official said, that will indicate that Ivins was the lone suspect.
Ivins died on Tuesday at a hospital. Tom Ivins, a brother of the scientist, told The Associated Press that his other
brother, Charles, had told him that Bruce committed suicide and Tylenol might have been involved.
The Los Angeles Times, which first reported that Ivins was under suspicion, said the scientist had taken a massive dose of a prescription Tylenol mixed with codeine.
Ivins, who received three degrees including a Ph.D. from the University of Cincinnati, co-authored numerous anthrax studies.
Colleagues and court documents describe Ivins as a brilliant scientist who recently began showing signs
Maryland court documents show he recently received psychiatric treatment. Last week he was ordered to stay
away from a woman he was accused of stalking and threatening to kill.
The biodefence laboratory and its specialised scientists for years have been at the centre of the FBI's investigation of the anthrax mailings.
In late June, the government exonerated a colleague of Ivins', Steven Hatfill. Hatfill's name has for years been associated with the attacks after investigators named him a "person of interest" in 2002.
Unusual behaviour by Ivins was noted in the six months following the anthrax mailings, when he conducted
unauthorised testing for anthrax spores outside containment areas at the infectious disease research unit where he