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High profile twitter account holders like Joe Biden, Elon Musk, Jeff Bezos were the targets of a widespread hack to offer fake bitcoin deals on Wednesday in one of the most pronounced security breaches on a social media site.

Those accounts and many others posted a message promoting the address of a bitcoin wallet with the claim that the amount of any payments made to the address would be doubled and sent back — a known cryptocurrency scam technique.

In the hours following the initial scam posts, Kim Kardashian West, Jeff Bezos, Bill Gates, Barack Obama, Wiz Khalifa, Warren Buffett, YouTuber MrBeast, Wendy’s, Uber, CashApp and Mike Bloomberg also posted the cryptocurrency scam.

This is massive,” said cybersecurity expert Rachel Tobac, the CEO of SocialProof Security. “This is most likely the largest attack I’ve ever seen. We are extremely lucky that these attackers are monetarily motivated and not sowing mass chaos all over the world.”

The attack also partially shut down the network. Twitter said in a tweet on Wednesday afternoon that some users weren’t able to tweet while it was addressing the incident. Users with the check mark indicating that their accounts were verified by Twitter reported that they weren’t able to tweet.

Twitter said in a later tweet that it “detected a coordinated attack by people who successfully targeted some of our employees with access to internal systems and tools.” The hackers used that access to take over the accounts.

The main blockchain address used on the scam site had already collected more than 12.5 bitcoin — some $116,000 in USD — and it’s going up by the minute.

A spokesperson for Binance told TechCrunch: “The security team is actively investigating the situation of this coordinated attack on the crypto industry.” Several other companies affected by the account hacks did not immediately respond to a request for comment.

Another wave of twitter attack after Asian country. Now it’s turn for US for going twitter cyber attack demanding cryptocurrency.