Twitter Hack: FBI Investigates Major Cyber Attack on Barack Obama,Bill Gates and Co
"The accounts appear to have been compromised in order to perpetuate cryptocurrency fraud," said the bureau, urging the public to be vigilant.
Elon Musk, Bill Gates and Joe Biden were among those hit in what Twitter said was a "co-ordinated" attack.
Their official accounts requested donations in the cryptocurrency.
"Everyone is asking me to give back," said a tweet from the account of Mr Gates, the Microsoft founder. "You send $1,000, I send you back $2,000."
The US Senate Commerce committee has demanded Twitter brief it about Wednesday's incident by 23 July.
Twitter said the hackers had targeted its employees "with access to internal systems and tools".
"We know they [the hackers] used this access to take control of many highly-visible (including verified) accounts and Tweet on their behalf," the company said in a series of tweets.
It added that "significant steps" had been taken to limit access to such internal systems and tools while the company's investigation continues.
The tech firm has also blocked users from being able to tweet Bitcoin wallet addresses for the time being.
The UK's National Cyber Security Centre said its officers had "reached out" to the tech firm. "We would urge people to treat requests for money or sensitive information on social media with extreme caution," it said in a statement.
US politicians also have questions. Republican Senator Josh Hawley has written to the company asking if President Trump's account had been vulnerable.
President Trump's account was not compromised, the White House said.
The chair of the Senate Commerce committee has also been in contact with Twitter.
"It cannot be overstated how troubling this incident is, both in its effects and in the apparent failure of Twitter's internal controls to prevent it," Senator Roger Wicker wrote to the firm.
One cyber-security expert said that the breach could have been a lot worse in other circumstances.
"If you were to have this kind of incident take place in the middle of a crisis, where Twitter was being used to either communicate de-escalatory language or critical information to the public, and suddenly it's putting out the wrong messages from several verified status accounts - that could be seriously destabilising," Dr Alexi Drew from King's College London told the BBC.
Emergency response
Twitter earlier had to take the extraordinary step of stopping many verified accounts marked with blue ticks from tweeting altogether.
Password reset requests were also being denied and some other "account functions" disabled.
By 20:30 EDT (00:30 GMT Thursday) users with verified account started to be able to send tweets again, but Twitter said it was still working on a fix.
Skip Twitter post by @jack
To[b]ugh day for us at Twitter. We all feel terrible this happened.
We’re diagnosing and will share everything we can when we have a more complete understanding of exactly what happened.
Instagram message
The BBC report from a security source that a web address - cryptoforhealth.com - to which some hacked tweets directed users was registered by a cyber-attacker using the email address mkeyworth5@gmail.com.
The name "Anthony Elias" was used to register the website, but may be a pseudonym - it appears to be a play on "an alias".
Cryptoforhealth is also a registered user name on Instagram, apparently set up contemporaneously to the hack.
The description of the profile read "It was us", alongside a slightly smiling face emoticon.
The Instagram profile also posted a message that said: "It was a charity attack. Your money will find its way to the right place."
In any case, the real identities of the perpetrators are as yet unknown.
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