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Tesla Inc. chief executive Elon Musk said on Monday in an e-mail to staff that an unnamed Tesla employee had conducted “extensive and damaging sabotage” to the company’s operations including allegedly making unspecified code changes to its manufacturing operating system and sending what the e-mail said was sensitive Tesla data to unnamed third parties.

Company spokeswoman Gina Antonini declined to comment on the e-mail.

Musk said in the e-mail, which was seen by Reuters, that he learned about this alleged behaviour over the weekend.

“The full extent of his actions are not yet clear, but what he has admitted to so far is pretty bad,” Musk wrote. “His stated motivation is that he wanted a promotion that he did not receive.” Musk did not specify to whom he was referring.

Reuters could not independently confirm any of the claims in the e-mail.

Musk wrote that the company would be investigating the matter this week, adding that Tesla needed to determine if the person was acting alone or in concert with “any outside organizations.”

“As you know, there are a long list of organizations that want Tesla to die,” Musk wrote, saying they included Wall Street short-sellers, oil and gas companies, and car company rivals but naming none.

Earlier on Monday, Musk sent a separate e-mail to employees informing them of a “small fire” on Sunday at a company facility. The e-mail was seen by Reuters.

Tesla said in an e-mail that on Sunday night there had been a “smouldering in an air filter in the welding area of the body line. The smouldering was extinguished in a matter of seconds. There were no injuries or significant equipment damage, and production is back online.” The company did not specify the location of the fire, which Reuters was unable to independently confirm.

Musk said in the e-mail that while the fire could have been a random event, “Please be on the alert for anything that’s not in the best interests of our company.”

Last week, Musk announced that nine per cent of the company’s work force was being laid off, without specifying an exact number.

Musk said the reorganization did not affect hourly assembly-line employees and was not expected to delay manufacturing targets.

Tesla’s future long-term profitability hinges on ramping up Model 3 output, which is intended for mass production.

Tesla’s stock price slipped 53 cents to $370.30 in after-hours trading on Monday.

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