Anthrax Evidence Called Mostly Circumstantial

?The evidence amassed by F.B.I. investigators against Dr. Bruce E. Ivins, the Army scientist who killed himself last week after learning that he was likely to be charged in the anthrax letter attacks of 2001, was largely circumstantial, and a grand jury in Washington was planning to hear several more weeks of testimony before issuing an indictment, a person who has been briefed on the investigation said on Sunday.?