The Anthrax Attacks - case not closed

The 2001 anthrax attacks helped raise the fear level in the US of A, and propelled it to war.  The perpetrator(s) have not been found.  The FBI pinned the blame on a scientist, Bruce Ivins, who committed suicide;  but its case was not convincing to a lot of people.  Now the FBI's case has been further weakened.  The perpetrator(s) remain at large.