"WASHINGTON — After four years of painstaking scientific research, the F.B.I. by 2005 had traced the anthrax in the poisoned letters of 2001 to a single flask of the bacteria at the Army biodefense laboratory at Fort Detrick, Md., according to government scientists and bureau officials.
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About 18 months ago, investigators appeared to sharpen their focus on Bruce E. Ivins, a veteran anthrax researcher, whom they placed under intensive surveillance as they examined every aspect of his life and work.
Since Dr. Ivins’s suicide last week, F.B.I. officials have said prosecutors were preparing to indict him for sending the anthrax letters, which killed five people, although charges appear to have been a few weeks away.
Dr. Ivins had been a respected microbiologist for three decades at the United States Medical Research Institute of Infectious Diseases at Fort Detrick. He was a popular neighbor in Frederick, Md., a Red Cross volunteer and an amateur juggler who played keyboards at his church.
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