Elon Musk says he is taking legal action against the holder of a Twitter account that tracks his private jet, arguing it put his son at risk.
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The @ElonJet account, which has more than half a million followers, was suspended on Wednesday.
Its owner Jack Sweeney, 20, used publicly available flight-tracking information to tweet every time Mr Musk's jet took off and landed.
Mr Musk says legal action is now being taken against Mr Sweeney and others.
He said that any account revealing people's real-time locations will be suspended "as it is a physical safety violation".
Mr Musk tweeted on Wednesday evening: "Any account doxxing real-time location info of anyone will be suspended, as it is a physical safety violation. This includes posting links to sites with real-time location info."