"The full extent of his actions are not yet clear, but what he has admitted so far is pretty bad", said Musk.
Tesla has been dogged with delays surrounding delivery of its all-electric BMW 3 Series-rivalling Model 3 saloon, but continues to push ahead with future products such as the Tesla Semi truck, the new Roadster and an EV alternative the Volkswagen Golf, which Musk alluded to at the company's recent shareholder meeting.
A Tesla spokeswoman confirmed the authenticity of the Monday email, which CNBC reported first. Musk says this was the right move, "in light of these actions".
In his email, released by CNBC, Musk has claimed that the saboteur has done an extensive and damaging sabotage to Tesla's operations.
Musk said that the company was trying to determine if the man was working alone or in concert with an outside organization, adding that there is a long list of them "that want Tesla to die", including short-sellers and oil and gas companies.
Morocco v Iran 15 June 2018
The match in itself had far from the smoothness of the first half, with injuries and substitutions punctuating the entire half. But, despite Morocco having 68% of possession and 13 shots, Iran picked up the victory.
Potential organizations that may wish to harm Tesla, at least according to Musk, include Wall Street short-sellers, oil and gas companies that "don't love the idea of Tesla advancing the progress of solar power & electric cars", and big gas and diesel vehicle company competitors.
An investigation will take place looking at, amongst other things, the passing of sensitive data to competitors, an issue that has blighted the automotive auto sector for a while, and probably serving as a reminder of how big the stakes are. However, it's not the affordable version of the Model 3 that this line is making. "If they're willing to cheat so much about emissions, maybe they're willing to cheat in other ways?"
"Could just be a random event, but as Andy Grove said, "Only the paranoid survive" Musk wrote, referring to the late CEO of Intel. That's 9 percent of the workforce and the biggest job cut in.
But documents the company filed days later with the state of California show that more than 400 workers will be terminated at its Fremont factory, including dozens of directors, managers, technicians and other workers in manufacturing, engineering and quality inspection.
Meanwhile, there was a "small fire" at a company factory on Sunday, although the exact location was not revealed. "Please be on the alert for anything that's not in the best interests of our company". At the company's annual meeting earlier this month, Musk said he expected to reach that target by the end of June.