https://arstechnica.com/tech-policy/2022/10/elon-musk-is-under-federal-investigation-for-merger-conduct-twitter-tells-judge/

Elon Musk is being investigated over "conduct" related to his pending acquisition of Twitter, the company said in an October 6 court filing that was just made public yesterday. "Elon Musk is presently under investigation by federal authorities for his conduct in connection with the acquisition of Twitter," Twitter told Delaware Court of Chancery Judge Kathaleen McCormick.

Twitter's filing mostly describes its efforts to obtain documents related to the ongoing investigations. It says a privilege log produced by Musk's law firm refers to "drafts of a May 13 email to the SEC [Securities and Exchange Commission]" and "a slide presentation to the FTC [Federal Trade Commission]," but that "the final communications themselves were neither produced nor logged."