MINNEAPOLIS (WCCO) — The Minnesota Department of Corrections says an investigation is underway after one of its officers was assaulted by an offender Wednesday morning.

According to officials, a corrections officer in the sergeant rank was seriously attacked by an offender at Minnesota Correctional Facility—Oak Park Heights. The officer suffered non-life threatening injuries.

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“The sergeant fought back and was then assisted by the full force of our correctional officer response,” the Department of Corrections said.

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The facility was locked down.

The offender was serving a life sentence for aiding and abetting second-degree murder. After the investigation, officials say it’s expected that a referral for prosecution will be made.

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“In the face of a very difficult day, the other corrections officers are honoring their colleague by continuing to do their jobs with professionalism. This is a reminder of the difficult job our corrections officers do every day to keep Minnesotans and our prisons safe,” the Department of Corrections said.