Two US marines have been convicted of giving electric shocks to an Iraqi prisoner, US officials have announced.
The US says the abuse of prisoners was not officially sanctioned
The abuse happened at a temporary detention centre south of Baghdad in April - months after the abuses at Abu Ghraib prison, officials said.
Pfc Andrew Sting and Pfc Jeremiah Trefney, both 19, entered guilty pleas at a 14 May hearing in Iraq, the military said on Thursday.
Both men have been jailed. Two other marines are awaiting court action.
According to the military statement, Sting, Trefney and two other unnamed marines decided to shock a prisoner at Al Mahmudiya prison, as a punishment for throwing rubbish outside his cell and speaking loudly.
They attached wires to a power converter, which was used to shock the prisoner with 110 volts of electricity, according to the statement from the US 1st Marine Expeditionary Force in Iraq.
Sting pleaded guilty to charges of assault, cruelty and maltreatment, dereliction of duty and conspiracy to commit assault. He was sentenced to a year in prison.
Trefney pleaded guilty to cruelty and maltreatment, dereliction of duty and conspiracy to commit assault. He was sentenced to eight months in prison.
Both men were demoted and will be discharged from service.
Iraqi prisoner buried
Sting and Trefney were infantrymen with the 2nd Battalion, 2nd Marine Regiment, which is attached to the 1st Marine Division.
Their pleas came five days before an American soldier was convicted of abusing prisoners in Abu Ghraib prison.
Jeremy Sivits was sentenced to one year in prison after admitting that he abused inmates and photographed them in humiliating poses.
Meanwhile, relatives of a man who was allegedly beaten to death in American custody in Abu Ghraib have finally been able to bury him - seven months after he was arrested and disappeared into the Iraqi prison system.
The family of Munadil al-Jumeili did not know what had become of him until a newspaper published a picture of his body, wrapped in plastic, lying at the feet of a grinning American soldier.
Another soldier has testified that Mr Jumeili was beaten to death in a prison shower in November less than 48 hours after he was arrested in the middle of the night.
Relatives say they were never told why Mr Jumeili had been arrested.
The US army says it is investigating the circumstances of his death.
Six other soldiers have been charged with the abuse of prisoners at Abu Ghraib.