The staggering hack compromised accounts belonging to VIPs ranging from former President Barack Obama and presumptive Democratic presidential nominee Joe Biden to billionaire businessmen Elon Musk and Jeff Bezos. The influential accounts were used to promote a Bitcoin scam.
Twitter said 130 accounts had been targeted by the attackers. Of those, 45 accounts were successfully breached, Twitter said.
The company also said Friday night that several of its employees had been targeted by the hackers to gain access to internal systems.
Members of Congress, cybersecurity experts and Twitter itself have been searching for answers about how the hack happened.
Images circulating online purporting to show a screenshot of an internal Twitter control system connected to the hack are being looked at by federal investigators, law enforcement sources tell CNN. The tool appeared to include the ability to change the email address associated with a Twitter account, which could potentially allow a Twitter account to be taken over.
Twitter has removed tweets with the images from its platform, according to people who have posted them. A Twitter spokesperson told CNN Friday it was removing images that included personal or private information.
The spokesperson would not say if the images actually showed an internal Twitter system, citing Twitter’s ongoing investigation.
A Twitter spokesperson confirmed the company has been in touch with the FBI.