WHITEVILLE, Tenn. (AP) — Authorities say a southwestern Tennessee prison is on lockdown following fights that sent three inmates to a hospital.

The Tennessee Department of Corrections says the fights broke out Sunday night at the Hardeman County Correctional Center in Whiteville, about 60 miles (96 kilometers) east of Memphis.

Corrections spokeswoman Neysa Taylor says in a news release two inmates were injured and a third required medical treatment for an undisclosed condition. Taylor said one of the inmates remained hospitalized Monday.

A message left at the prison wasn't immediately returned. The prison is operated by private corrections contractor CoreCivic.

The Department of Corrections is investigating what led to the fights.