Documents: Ivins had custody of purified anthrax

WASHINGTON (AP) - Army scientist Bruce Ivins had custody of highly purified anthrax spores that had "certain genetic mutations identical" to the poison that killed five and rattled the nation in 2001, according to documents unsealed Wednesday in the government's investigation.

Also, Ivins was unable to give investigators "an adequate explanation for his late laboratory work hours around the time of" the attacks, and he apparently sought to mislead investigators on the case, according to an affidavit filed by one government investigator.

The scientist committed suicide last week as investigators were preparing to charge him with murder in the 2001 attacks. The documents were released as the FBI held a private briefing for families of the victims of the episode, and officials said the agency was preparing to close the case....