Former president Barack Obama, Microsoft co-founder Bill Gates and corporate accounts for both Uber and Apple also appeared to be targeted, and at least one Silicon Valley entrepreneur warned of a wider-spread attack. The tweets all instructed people to send cryptocurrency to the same bitcoin address. The tweets were removed shortly after being posted, and Twitter spokeswoman Aly Pavela said the company was investigating.

New tweets that appeared to be hackers were still being posted more than an hour after Musk’s account tweeted the scam message.

A now-deleted tweet from Tesla CEO Musk’s account said, “Feeling greatful, doubling all payments sent to my BTC address! You send $1,000, I send back $2,000! Only doing this for the next 30 minutes.”

His account continued to tweet similar posts as they were deleted.