Using the available scientific evidence "it is not possible to reach a definitive conclusion" about the source of the anthrax used in the 2001 anthrax letter attacks which killed five people, according to a report issued Tuesday by the National Academy of Sciences.
Dr. Bruce Ivins, the former government scientist blamed for a string of deadly 2001 anthrax attacks, behaved oddly and was "sarcastic and nasty" to his wife in the final weeks of his life, police documents said.
The man who authorities allege carried out the 2001 anthrax mailings that killed five people sent himself an e-mail saying he knew the attacker's identity, according to court documents released Wednesday.
Former colleagues of Bruce Ivins, the man blamed for the 2001 anthrax attacks, accused federal agents Wednesday of hounding the government researcher and his family to the point where Ivins took his own life.
A federal prosecutor formally declared Army biological researcher Bruce Ivins the sole person responsible for creating and mailing the bacterial spores that killed five people in the 2001 anthrax attacks.
Federal investigators will declare the 2001 anthrax case solved on Wednesday, when they make public their case against government researcher Bruce Ivins, a government source familiar with the case told CNN on Tuesday.