The United Kingdom’s election watchdog says hackers may have gathered information on tens of millions of British voters after they managed to access to electoral registers.

On Tuesday, the Electoral Commission apologized for the breach.

The commission says much of the information was already in the public domain and the names and addresses of people who registered to vote between 2014 and 2022 was unlikely to be used by “hostile actors” to sway elections.

While the hack occurred two years ago, the commission says it only discovered the breach back in October.

The U.K.’s Electoral Commission says it needed to secure its computer systems before it could notify voters.