DC: An error at California’s Department of Motor Vehicles caused more than a thousand people, including some who were not U.S. citizens, to be incorrectly registered to vote, state officials said Monday.

The DMV admitted that a “processing error” at agency field offices resulted in as many as 1,500 people being added to voter rolls between April 23 and Sept. 25.

The widespread glitch was discovered after Randall Marquis, a Canadian citizen and legal U.S. resident living in California, notified the DMV he had received a piece of mail from the agency saying he was registered to vote. In response to Marquis’ alert, the agency ordered an internal audit and discovered hundreds of similar cases.

“This error occurred when DMV technicians processed customer requests at field offices to change voter eligibility responses on driver license applications,” the DMV wrote in a letter to California Secretary of State Alex Padilla, according to the San Francisco Chronicle. “Due to the order in which the change was processed, the customer’s initial responses were retained instead of the correct and revised responses.”

The DMV said the improper registrations were made “through no fault of the customer.” None of the people who were registered to vote due to the error were illegal immigrants, the agency added. read more