Tesla CEO Elon Musk has reportedly sent an email to employees with news that one worker committed “extensive and damaging sabotage” to the electric car maker’s operations.

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The email, sent late Sunday night to all Tesla employees, details how an unidentified employee changed the code to Tesla’s manufacturing operating system and exported “large amounts” of internal data to “unknown third parties.”

“The full extent of his actions are not yet clear, but what he has admitted to so far is pretty bad,” Musk wrote in the email, according to Electrek and CNBC.

Tesla declined to comment on the reports.

The employee is said to have been upset over a promotion that he didn’t receive, Musk added. He said Tesla will continue its investigation this week to determine if the employee was acting alone or “if he was working with any outside organizations.”

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