Some Hoosier voters have contacted the Secretary of State's office after discovering the date of birth or first name on their voter registration is incorrect.

INDIANAPOLIS (WTHR) - Indiana State Police were called in Monday night to investigate possible voter tampering and fraud after the Indiana Secretary of State's office discovered voter registration irregularities.

"It is concerning, but I want voters to know our system is intact, and we are confident that our system has not been hacked," Secretary of State Connie Lawson told WTHR.

She said concerns began earlier this month when voters called the Secretary of State's office to say they'd tried to verify their voter registration on the state's website, only to find they weren't listed. Lawson said she later determined some of the voters' first names and dates of birth were altered without their permission, which prevented the voters from finding their registrations listed online. Further investigation by Lawson's office revealed there were many more recent voter registration name and birth date changes than during the 2012 and 2008 Presidential election cycles.

"I think it's important to keep in mind that there are reasons why somebody would legitimately change their date of birth and their first name, so we really don't know why there's so many more this year," she said.

Lawson decided to forward the information Monday night to Indiana State Police and to request additional investigation.

"We don't want to take a chance that any voter will be disenfranchised on Election Day," Lawson said.

In the meantime, she urges all Hoosiers to check their voter registration status online at indianavoters.com. By entering their county, name, and date of birth, voters can determine if they are properly registered. Those who find missing or incorrect information still have time to get that corrected by contacting their county election office as soon as possible.

Election officials are expecting long lines on Election Day, and Lawson fears voter registration problems like the one identified by her office could make wait times worse. In a press release, the Secretary of State's office reported the potential for thousands of voters to be impacted by changed first names and birth dates on their voter registration files. Indiana has approximately 4.8 million registered voters for the 2016 general election.

Voters who have discrepancies between their identification and voter register information should be allowed to cast a provisional ballot that will still count after a contested registration is verified later, according to Lawson.

The Secretary of State said she did not know if the changed names and birth dates impacted more Democrat or Republican voters, and that her office did not investigate that question.

Indiana State Police are currently investigating another allegation of possible voter fraud involving Patriot Majority USA's Indiana Voter Registration Project. A state police spokesman told WTHR that investigators are trying to determine if there is any connection to that group and the irregularities detected by the Secretary of State.

"What I can tell you at this moment is the changing of a first name and/or date of birth is consistent with what we are seeing on a number of voter registration applications submitted by PMUSA IVRP," the spokesman said.

Lawson said she has not seen any "widespread voter fraud" as Republican presidential nominee Donald Trump has alleged in recent weeks.

"I have only seen two cases since I have been the secretary of state, and both of them were prosecuted," she said.