Twitter says 130 accounts were targeted in a major cyber-attack of celebrity accounts two days ago.
However, Twitter says only a “small subset” of those 130 accounts had control seized by the attacker.
The security breach saw accounts including those of Barack Obama, Elon Musk, Kanye West and Bill Gates tweet a Bitcoin scam to millions of followers.
Twitter said it was still trying to work out if private data – which could include direct messages – was stolen.
“We’re working with impacted account-owners and will continue to do so over the next several days,” the company said, through its official support account.
“We are continuing to assess whether non-public data related to these accounts was compromised,” it added.
The FBI is now investigating.