BISHOPVILLE - Authorities say 150 inmates are back behind bars at a state prison after outnumbered guards fled the area when several prisoners refused to return to their cells.

Prisons spokesman Josh Gelinas says three inmates suffered minor injuries, but all the guards were fine after officers went back into the wing at Lee Correctional Institution Wednesday night.

Prison officials say guards had sealed off the dorm in the late afternoon because there weren't enough officers to immediately respond when the inmates refused to go to their cells following dinner.

Gelinas says authorities are still trying to evaluate the situation in the dorm.

Officials have placed the maximum security prison's 1,720 male inmates on lockdown.