(AP) — An internal investigation by the Lincoln Police Department has found that two officers used excessive force in separate incidents.

In the first incident in December, an officer shoved a handcuffed inmate into a Lancaster County jail wall, causing a head injury. That officer quit the force before facing a disciplinary hearing.

Internal investigators say that in March, another officer shoved a man into a wall at a Lincoln homeless shelter and threw the man across the room. That officer faces a disciplinary committee.

Police Chief Jim Peschong and City Attorney Rod Confer declined to release the names of the officers involved, saying the incidents are personnel matters not subject to the state’s open records laws.