Yet another Minnesota prison guard was injured following an assault by an inmate.
The Minnesota Department of Corrections said the incident happened at MCF-Stillwater Thursday morning.
The Pioneer Press reports the lieutenant walked out of the facility on his own with non-life-threatening injuries that didn't require a hospital admission.
He nonetheless becomes the 11th Minnesota prison staff member to be injured in less than a week.
The first 10 were injured at Minnesota's maximum security facility, MCF–Oak Park Heights.
Five were injured in a fight with inmates last Friday, Mar. 23 and five more were injured in an incident with a single prisoner last Sunday.
MCF-Stillwater, opened in 1914, is the state's largest "close-security" prison for male felons.