A US federal jury convicted a 66-year-old Sacramento man for mailing more than 100 anthrax hoax letters last year.
Marc Keyser was convicted on three counts of sending the letters and two counts of mailing threatening communications.
He was arrested in October 2008 after several newspapers, other media outlets, businesses and the Modesto district office of California Republican politician George Radanovich, received threatening packages in the mail.
Prosecutors say the packages contained a computer disk labelled “Anthrax Shock and Awe Terror” and a small packet of sugar relabelled with a biohazard symbol and the words “Anthrax sample”.
Keyser is scheduled to be sentenced on November 30. He faces up to five years in prison and a 250,000 dollar fine for each count.