Someone used artificial intelligence-powered software to imitate Secretary of State Marco Rubio’s voice and writing style in contacting foreign ministers, a U.S. governor, and a member of Congress.

Authorities do not know who is behind impersonation attempts, The Washington Post reported Tuesday, citing a senior U.S. official and a cable sent by Rubio’s office to State Department employees.

However, the report added the offender likely was attempting to manipulate powerful government officials “with the goal of gaining access to information or accounts.”

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