Tesla CEO Elon Musk has claimed in a recent company email that an unnamed Tesla worker has purposefully caused ‘extensive and damaging sabotage’ to Tesla’s production line.

Musk sent a company-wide email to Tesla employees on Monday discussing a factory fire, which Musk seemed to imply could be the result of sabotage by an employee, CNBC reports. Musk said in the email that the individual had conducted “quite extensive and damaging sabotage” to the operations of Tesla, including tampering with production line code and even sent product data to unnamed outsiders.

The employee allegedly began to sabotage Tesla’s operations after he failed to receive a promotion that they thought he deserved. Musk said that following the revelation of his actions: “not promoting him was definitely the right move.” Musk urged employees to be extremely vigilant in the coming week as the company attempts to ramp up their production output to 5,000 cars a week, Musk stated that this was when the company was at its most vulnerable.

The full email from Musk can be read below:

From: Elon Musk To: Everybody Subject: Some concerning news June 17, 2018 11:57 p.m. I was dismayed to learn this weekend about a Tesla employee who had conducted quite extensive and damaging sabotage to our operations. This included making direct code changes to the Tesla Manufacturing Operating System under false usernames and exporting large amounts of highly sensitive Tesla 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. His stated motivation is that he wanted a promotion that he did not receive. In light of these actions, not promoting him was definitely the right move. However, there may be considerably more to this situation than meets the eye, so the investigation will continue in depth this week. We need to figure out if he was acting alone or with others at Tesla and if he was working with any outside organizations. As you know, there are a long list of organizations that want Tesla to die. These include Wall Street short-sellers, who have already lost billions of dollars and stand to lose a lot more. Then there are the oil & gas companies, the wealthiest industry in the world — they don’t love the idea of Tesla advancing the progress of solar power & electric cars. Don’t want to blow your mind, but rumor has it that those companies are sometimes not super nice. Then there are the multitude of big gas/diesel car company competitors. If they’re willing to cheat so much about emissions, maybe they’re willing to cheat in other ways? Most of the time, when there is theft of goods, leaking of confidential information, dereliction of duty or outright sabotage, the reason really is something simple like wanting to get back at someone within the company or at the company as a whole. Occasionally, it is much more serious. Please be extremely vigilant, particularly over the next few weeks as we ramp up the production rate to 5k/week. This is when outside forces have the strongest motivation to stop us. If you know of, see or suspect anything suspicious, please send a note to [email address removed for privacy] with as much info as possible. This can be done in your name, which will be kept confidential, or completely anonymously. Looking forward to having a great week with you as we charge up the super exciting ramp to 5000 Model 3 cars per week! Will follow this up with emails every few days describing the progress and challenges of the Model 3 ramp. Thanks for working so hard to make Tesla successful,

Elon

Tesla has not yet commented publicly on the situation.