Facebook has confirmed its password-related security incident last month now affects “millions” of Instagram users, not “tens of thousands” as first thought.

The social media giant confirmed the new information in its updated blog post, first published on March 21.

“We discovered additional logs of Instagram passwords being stored in a readable format,” the company said. “We now estimate that this issue impacted millions of Instagram users. We will be notifying these users as we did the others.”

“Our investigation has determined that these stored passwords were not internally abused or improperly accessed,” the updated post said, but the company still has not said how it made that determination.

The social media giant did not say how many millions were affected, however.

Last month, Facebook admitted it had inadvertently stored “hundreds of millions” of user account passwords in plaintext for years, said to have dated as far back as 2012. The company said the unencrypted passwords were stored in logs accessible to some 2,000 engineers and developers. The data was not leaked outside of the company, however. Facebook still hasn’t explained how the bug occurred.

Facebook posted the update at 10am ET — an hour before the Special Counsel’s report into Russian election interference was set to be published.

When reached, spokesperson Liz Bourgeois said Facebook does not have “a precise number” yet to share, and declined to say exactly when the additional discovery was made.