COLBERT, Okla. (KTEN) — The Colbert Police Department is now down to just one staff officer while the Oklahoma State Bureau of Investigation looks into the potential use of force by the department.

Johnny Miller was one of the officers the city let go the same day that the OSBI started its investigation, having served for the department for almost six years.

Miller was serving as the interim chief and was assistant to Chief David Peterson before his termination in July.

"I found out that one of my officers was involved in a use of force," Miller said. "Upon investigating, I was told it was going to be excessive, and that it was going to be turned over to OSBI, and not to release the video."

Miller said that same day he refused to show the city manager the video and was later suspended that afternoon.

Miller's son, David, was terminated from the department the same day as his dad.

"I was just shocked," David Miller said. "I done what I was told to do, and the following week I was suspended... and the week after that, fired."

Johnny Miller said the city told him and his son they were under investigation, but didn't say why.

"I just want to clear up mine and my son's name," the elder Miller said. "The way we was terminated, the time we was terminated... people believe that it's us that's under investigation; it's the officer that's still at work that's being investigated."

OSBI said the investigation remains active and offered no comment about the case.

The Bryan County Sheriff's Office is providing additional assistance to Colbert during the staffing crisis.