Army scientist Bruce Ivins “was the only person responsible” for anthrax attacks in 2001 that killed five and rattled the nation, the Justice Department said Wednesday, backing the claim with dozens of documents all pointing to his guilt.

Documents made public alleged that Ivins, who committed suicide last week, had sole custody of highly purified anthrax spores with “certain genetic mutations identical” to the poison used in the attacks. Investigators also said they had traced back to his lab the type of envelopes used to send the deadly spores through the mails.

Ivins killed himself last week as investigators closed in, and U.S. Attorney Jeffrey Taylor said, “We regret that we will not have the opportunity to present evidence to the jury.”

(Source: WNBC)