More than a thousand Twitter employees have internal permissions to help hackers break into accounts.

As of earlier this year, more than 1,000 Twitter employees and contractors had been able to use internal tools to change user account settings and give control to others,media reported. That makes it more difficult to guard against last week’s massive hacking.

More than a thousand Twitter employees have internal permissions to help hackers break into accounts.

Twitter and the FBI are investigating the hacking. During the hack, hackers could repeatedly send tweets through authenticated accounts, including Democratic presidential candidate Joe Biden and billionaire Bill Gates.

Twitter said on Saturday that hackers had “manipulated a small number of employee accounts, used their certificates” to log in to the tool and gain access to 45 accounts. They also said on Wednesday that hackers could read private messages from 36 accounts, but did not disclose specific accounts affected.

Former employees familiar with Twitter’s security policies say many have such permissions, or more than 1,000 by early 2020, including contractors such as Kochiat.

Twitter declined to comment on the figure, nor would it say whether the figure had dropped before the blackout. But the company says it is looking for new security chiefs who want to strengthen system security and train staff against external attacks.

Mr. Kochie also did not comment.