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JACKSONVILLE, Fla. (AP) - A north Florida woman has pleaded guilty to mailing hoax anthrax letters to the offices of U.S. Sens. Marco Rubio and Bill Nelson.

The U.S. Attorney's Office in Jacksonville reports that 47-year-old Kathryn Cohen Allen pleaded guilty last week to two of the nine counts she had been facing. She faces up to ten years in prison.

Authorities say Allen mailed threatening letters containing a non-hazardous, white powdery substance in June 2011 to the two senators' offices. Allen had also been charged with sending similar letters to other government offices and to three private citizens, but those counts were dismissed as part of her plea agreement.

Allen admitted that she sent the letters in an effort to frame her neighbor, whom she believed was engaged in an interracial relationship.

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