Hilderbrand & Clark, a CPA firm based in San Ramon, Calif., has disclosed it detected unauthorized access to its computer systems from abroad while filing tax returns.

The firm said in a news release Thursday that it experienced “unusual activity” while filing two tax returns on extension. It said it immediately notified the Internal Revenue Service, had its local IT firm review the system and hired a specialized forensic IT firm to investigate. On July 10, the forensic IT firm found there was unauthorized access to the firm’s system from a foreign IP address on June 14, 2017.

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