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OLIVIER DOULIERY/AFP/Getty Images

A British man, a Florida man and a Florida teen hacked the Twitter accounts of prominent politicians, celebrities and technology moguls to scam people around globe out of more than $100,000 in Bitcoin, authorities said Friday.

Graham Ivan Clark, 17, was arrested Friday in Tampa, where the Hillsborough State Attorney’s Office will prosecute him as adult. He faces 30 felony charges, according to a news release. Mason Sheppard, 19, of Bognor Regis, U.K., and Nima Fazeli, 22, of Orlando, were charged in California federal court.

In one of the most high-profile security breaches in recent years, hackers sent out bogus tweets on July 15 from the accounts of Barack Obama, Joe Biden, Mike Bloomberg and a number of tech billionaires including Amazon CEO Jeff Bezos, Microsoft co-founder Bill Gates and Tesla CEO Elon Musk. Celebrities Kanye West and his wife, Kim Kardashian West, were also hacked.

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The tweets offered to send $2,000 for every $1,000 sent to an anonymous Bitcoin address.

“There is a false belief within the criminal hacker community that attacks like the Twitter hack can be perpetrated anonymously and without consequence,” U.S. Attorney David L. Anderson for the Northern District of California said in a news release. “Today’s charging announcement demonstrates that the elation of nefarious hacking into a secure environment for fun or profit will be short-lived.”

Although the case against the teen was also investigated by the FBI and the U.S. Department of Justice, Hillsborough State Attorney Andrew Warren explained that his office is prosecuting Clark in Florida state court because Florida law allows minors to be charged as adults in financial fraud cases such as this when appropriate.

“This defendant lives here in Tampa, he committed the crime here, and he’ll be prosecuted here,” Warren said.

Twitter previously said hackers used the phone to fool the social media company’s employees into giving them access. It said hackers targeted “a small number of employees through a phone spear-phishing attack.”

“This attack relied on a significant and concerted attempt to mislead certain employees and exploit human vulnerabilities to gain access to our internal systems,” the company tweeted.

After stealing employee credentials and getting into Twitter’s systems, the hackers were able to target other employees who had access to account support tools, the company said.

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The hackers targeted 130 accounts. They managed to tweet from 45 accounts, access the direct message inboxes of 36, and download the Twitter data from seven. Dutch anti-Islam lawmaker Geert Wilders has said his inbox was among those accessed.

Internal Revenue Service investigators in Washington, D.C., were able to identify two of the hackers by analyzing Bitcoin transactions on the blockchain – the ledger where transactions are recorded – including ones the hackers attempted to keep anonymous, federal prosecutors said.

Spear-phishing is a more targeted version of phishing, an impersonation scam that uses e-mail or other electronic communications to deceive recipients into handing over sensitive information.

Twitter said it would provide a more detailed report later “given the ongoing law enforcement investigation.”

The company has previously said the incident was a “co-ordinated social engineering attack” that targeted some of its employees with access to internal systems and tools. It didn’t provide any more information about how the attack was carried out, but the details released so far suggest the hackers started by using the old-fashioned method of talking their way past security.

British cybersecurity analyst Graham Cluley said his guess was that a targeted Twitter employee or contractor received a message by phone asking them to call a number.

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“When the worker called the number they might have been taken to a convincing (but fake) helpdesk operator, who was then able to use social engineering techniques to trick the intended victim into handing over their credentials,” Clulely wrote Friday on his blog.

It’s also possible the hackers pretended to call from the company’s legitimate help line by spoofing the number, he said.

Hillsborough County court records didn’t list an attorney for Clark, and federal court records didn’t list attorneys for Sheppard or Fazeli.

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