Frankfort, KY – U.S. Representative for Kentucky's first district Ed Whitfield is one of at least four congressmen in Kentucky that received a suspicious letter at his office. The offices of Representatives John Yarmuth, Geoff Davis and Brett Guthrie and federal courthouses in London, Frankfort and Pikeville also received letters in the mail yesterday morning purported to contain anthrax. U.S. Marshal Mike Klein says between 25-50 of the letters were determined to have been mailed by an inmate at the Big Sandy Federal Prison in Martin County. The letters stated the powder in them contained anthrax. Tests showed there were no harmful substances and the threats were a hoax.