Washington (CNN) Seventy-seven apparent non-citizens voted in Ohio's general election in November 2018, the state's top election official said Wednesday, and another 277 were able to successfully register in violation of state law.

The announcement from Republican Ohio Secretary of State Frank LaRose -- coming after years of GOP warnings of massive voter fraud -- means that of the 4,496,834 ballots cast in Ohio on November 6, 2018, just .002% of them were illegal.

LaRose's office said those caught are in the US legally, but do not hold US citizenship, and have been referred for investigation and prosecution by the state attorney general. A spokesman for Attorney General Dave Yost said his office was in the process of reviewing the matter.

The secretary of state's office used the state's voter registration database and motor vehicles department's records of driver's license and identification card applications that indicate one's citizenship status to identify the non-citizens. Those who voted illegally and illegally registered to vote gave documentation to the department of motor vehicles identifying themselves as non-citizens, according to the release.

It also said notices were sent to the address where they are registered to vote requesting they cancel their voter registration or notify LaRose's office if they have become a US citizen.

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