INDIANAPOLIS, IN (WISH) – Thousands of birth dates and names listed on Indiana voter registrations were changed, officials said Tuesday, prompting an investigation into possible voter fraud.

Hoosiers reported finding the incorrect information when checking to see if they were registered to vote, according to a media release from Secretary of State Connie Lawson.

“These records were changed on paper forms, at the BMV and online,” Lawson said in a statement. “At this time, my office is not sure why these records were changed, but we have evaluated the Statewide Voter Registration System and have found no indication it has been compromised.”

Voters who encountered the issue had cast a ballot in the primary election, Lawson added.

Altered voter information may cause some Indiana residents to not be able to find their registration.

The case has been handed over to Indiana State Police, which is also investigating a separate case of possible voter fraud involving 56 counties.

Election Day is Nov. 8.