Federal investigators probing the deadly 2001 anthrax attacks recovered samples of human hair from a mailbox in Princeton, N.J., but the strands did not match the lead suspect in the case, according to sources briefed on the probe.
....Authorities released sworn statements and search warrants last week at a news conference in which they asserted that Ivins was their sole suspect. But the materials have not dampened speculation about the merits of the investigative findings and the government's aggressive pursuit of Ivins, a 62-year-old anthrax vaccine researcher. Conspiracy theories have flourished since the 2001 attacks, which killed five people and sickened 17 others. ....
