A review released Tuesday by a panel of scientific experts casts doubt on FBI evidence that Bruce Ivins, a US Army researcher, committed the deadly anthrax mailings of 2001.

By Dan Vergano and Steve Sternberg The FBI never examined anthrax samples from the 2001 contamination of a biodefense lab that was covered up by their lead suspect in the anthrax mailings -- a decision that one of the FBI's leading anthrax experts calls "weird." Researcher Bruce Ivins in 2002 confessed to cleaning up the office contamination without telling anyone during an Army investigation at the U.S.

By Lara Jakes Jordan and Matt Apuzzo Associated Press WASHINGTON -- The murder weapon was a flask.

By Donna Leinwand, Ken Dilanian, Steve Sternberg and Dan Vergano WASHINGTON -- On several nights before the anthrax attacks in September and October 2001, bioweapons scientist Bruce Ivins repeatedly spent long periods alone in a secure laboratory that housed a strain of the lethal bacteria.

The FBI said Wednesday Bruce Ivins was behind the 2001anthrax letter attacks and the government could have proven his guilt if a case had gone to trial. "We are confident Dr.