Nassau acting Police Commissioner Thomas Krumpter ran a red light with his emergency lights on and struck another vehicle while traveling in his department-issued SUV in Uniondale last month, according to a police report released Wednesday.

The police department provided the redacted accident report to Newsday Wednesday afternoon, a day after initially refusing to release the document.

Krumpter was driving his unmarked 2016 Chevrolet Tahoe on Oak Street in Uniondale on Sept. 25 — the eve of the presidential debate at Hofstra University — when the crash occurred, according to the accident report.

Krumpter made a U-turn on Oak Street and continued southbound and went through a red light at Hempstead Turnpike, striking a 2015 Cadillac SUV traveling west on the turnpike at 5:20 p.m., according to the accident report. There were no injuries, the report said.

The report said Krumpter disregarded a traffic control device, and the driver of the Cadillac, a Hicksville resident whose name was redacted in the report, failed to yield to Krumpter’s vehicle.

Neither driver was issued a ticket, said Det. Lt. Richard LeBrun, commanding officer of the police department’s Public Information Office. LeBrun and a journalist were in Krumpter’s vehicle at the time, police said.

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Krumpter put on his emergency lights just before the crash because “he was monitoring and checking on critical safety check points” ahead of the presidential debate, LeBrun said.

The commissioner “made a U-turn, put his emergency lights on, made a full stop and attempted to ease into the intersection [against a red light] to proceed to the eastbound lanes of Hempstead Turnpike,” LeBrun said.

The commissioner was traveling “maybe 5 mph” at the time of the crash, LeBrun said.

Krumpter’s SUV, which had 4,391 miles at the time of the crash, sustained damage to its bumper and left headlight, totaling $1,298.05, according to a claim voucher submitted to the county. The repairs were made by R&A Auto Repair in Hicksville, the documents said.

Krumpter, who turned 50 Wednesday, was not available for comment, LeBrun said.

In a statement, LeBrun explained why the department didn’t release the accident report when Newsday asked for it Tuesday and instead directed a reporter to file a public records request.

“It is the policy of the NCPD to not provide information regarding auto accidents to individuals that have no connection to the accident. If a FOIL request is submitted requesting details, we will redact all information to protect the right to privacy of all individuals.”

The September accident was Krumpter’s third in a department vehicle — and the second in which he was found to be at least partially at fault — since 2014.

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Krumpter was cited by Suffolk police in March 2014 for “following too closely” when he rear-ended a car in East Northport. Four months later, an unlicensed driver struck the commissioner’s SUV blocks away from police headquarters in Mineola. He was not found at fault in that crash.

The department investigates all crashes involving department vehicles, LeBrun said. But he said he would not discuss whether Krumpter would be subject to discipline or retraining as a result of his numerous car accidents, citing state law 50-a, which shields the disciplinary records of police officers from public view.