ONLY, Tenn. (WVLT)– Three guards were flown to Vanderbilt University Medical Center, following a major disturbance inside a Tennessee state prison, according to the Tennessee Department of Corrections.

TDOC reported three corrections officers were assaulted at Turney Center Industrial Complex in Hickman County Sunday.

Two patients are in critical condition; one is in stable condition.

Authorities with the TDOC said the incident involved 20 inmates in one housing unit at the prison.

The housing unit has been placed on lockdown, and the inmates involved will be charged appropriately following the end of the investigation, according to TDOC.