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Musk recently renewed his attack against the caver, Vernon Unsworth, in emails that intensified unsupported allegations, according to a report Tuesday by Buzzfeed News.
This example of erratic behavior by Musk is likely to further worry among investors about his leadership of Tesla, the $50 billion electric-car maker he helped set up. Musk has already been criticized for announcing plans to take the company private on Twitter and then dropping them less than three weeks later.
Tesla didn't reply to a request for comment Tuesday on the Buzzfeed report, according to CNN.