The chief of the Minneapolis Police Department resigned after receiving a reprimand from the mayor amid an investigation into his conduct.

A protester confronts Minneapolis police after groups from competing protests confronted each other in downtown Minneapolis on January 17. Brian O'Hara, chief of the MPD, resigned Tuesday. File Photo by Craig Lassig/UPI UPI

May 27 (UPI) -- The chief of the Minneapolis Police Department, Brian O'Hara, resigned after receiving a reprimand from the mayor amid an investigation into his conduct.

O'Hara submitted his resignation late Tuesday, Mayor Jacob Frey announced Tuesday evening.

"Everyone makes mistakes, including me, but what I can't allow is a breach of trust," Frey said. "When you serve as chief of the Minneapolis Police Department, trust is not secondary to the job, it is the job. When trust is broken, it becomes extremely difficult to continue leading effectively."

Frey had sent a written reprimand to O'Hara on Tuesday as a result of the still-open investigation into misconduct allegations. The New York Times, which viewed records relating to the case, said there were multiple allegations that O'Hara had sexual relationships with fellow city workers.

The documents didn't reveal evidence of inappropriate relationships, but in his reprimand, Frey took issue with O'Hara deleting a contact for a city employee from his work-issued phone while the investigation was underway. O'Hara was also accused of telling another city employee that his phone had been taken from him for the investigation despite being told not to discuss the case with anyone, CBS News reported.

"Your behavior, as substantiated by the investigation, demonstrates poor judgment, is inconsistent with the level of integrity the role requires, and has made it extraordinarily difficult for you to continue effectively in your role," Frey's letter read.

O'Hara was hired to lead the Minneapolis Police Department in 2022, less than two years after the police killing of George Floyd put the department under scrutiny. The department was further put under strain earlier this year with the influx of federal immigration agents and subsequent protests.