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SAN FRANCISCO: The hackers who accessed dozens of high-profile Twitter accounts in mid-July gained access to the system with an attack that tricked a handful of employees into giving up their credentials, according to a company update.

Twitter said in a security update late Thursday that the July 15 incident by bitcoin scammers stemmed from a "spear phishing" attack which deceived employees about the origin of the messages.

The hackers "targeted a small number of employees through a phone spear phishing attack," according to a Twitter Support statement.

"This attack relied on a significant and concerted attempt to mislead certain employees and exploit human vulnerabilities to gain access to our internal systems."

Twitter said that following the incident it has "significantly limited access to our internal tools and systems" and is taking additional steps to tighten security. The massive hack of high-profile users from Elon Musk to Joe Biden affected at least 130 accounts as part of an effort to dupe people into sending hackers the virtual currency bitcoin.

The official accounts of Apple, Uber, Kanye West, Bill Gates, Barack Obama and others were also affected. Faked tweets were sent from 45 accounts, according to Twitter, and the hackers accessed private messages of 36 and downloaded Twitter data from seven.

Law enforcement is also investigating the incident which has raised concerns about the security of the platform increasingly used for conversations on politics and public affairs. John Dickson of the security firm Denim Group said the latest disclosure does not necessarily suggest a sophisticated attack from a nation-state.