Lewiston-based accounting firm Presnell Gage is in the process of notifying about 100 individuals or companies that their information may have been hacked during a data breach in the past month, and fraudulent tax returns filed.

Philip J. Nuxoll, managing member of the firm, said Tuesday his office was notified Aug. 18 by the Internal Revenue Service that some returns were filed using the firm's identification number without authorization.

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