Inmates at Abu Ghraib prison started a fire and attacked guards in a disturbance that required authorities to call in Iraqi troops, Iraqi officials said.
The US military said American helicopters were also called in for support after the prisoners tried to overpower guards in an apparent escape attempt.
US military spokesman Master Sgt. Nicholas Conner said Friday the unrest began when three inmates started a fire in their cell on Thursday night.
Conner said Iraqi authorities reported that three guards and three prisoners were injured before security forces regained control.
Abu Ghraib gained international notoriety in 2004 after the release of photos showing US soldiers abusing prisoners. The prison was later transferred to Iraqi control.