FORT ANN, N.Y. (AP) — Two convicted rapists have been indicted on charges of mailing white powder with letters threatening to blow up a western New York district attorney's office.

According to court records, the pair sent the letters to the Erie County district attorney's office in July. The white powder turned out to be ground soap.

The Post-Star of Glens Falls reports that Dionte Cooper and Michael Rispers were cellmates at Great Meadow Correctional Facility upstate when they allegedly sent the threatening letters.

Cooper is serving a 21-year sentence for three Buffalo-area rapes. He told authorities he was angry at the district attorney's office that prosecuted him.

Both men are currently incarcerated at Attica. They pleaded not guilty to the new charges Friday.

Information on attorneys for Cooper and Rispers wasn't available.

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Information from: The Post-Star, http://www.poststar.com

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