(This story has been corrected to say that the settlement demand was issued in connection with the SEC probe into Musk's Twitter takeover, not Neuralink, in paragraph 2) ...

The US Securities and Exchange Commission (SEC) has reopened its investigation into Neuralink, Elon Musk’s brain-implant company, alongside a probe into Musk’s acquisition of Twitter ...

Musk has long sparred with the SEC and last year four lawmakers asked ... investors about the safety of a brain implant developed by Neuralink.