Iraqi detainees at Abu Ghraib prison identified Private Lynndie England as one of the soldiers who sexually abused them, an army investigator has said.
Her lawyers say Pte England is being made a scapegoat
Special Agent Manora Iem was testifying to a military hearing that will decide if Pte England, 21, should face a court-martial over her actions.
The prosecution maintains that she was part of a group of rogue soldiers.
But her lawyers say she was acting on orders from superiors who encouraged rough treatment of prisoners.
Pte England's face became familiar after she appeared in photographs pointing at prisoners' genitals and holding a naked Iraqi detainee on a leash.
Special Agent Iem, who interviewed prisoners after the scandal came to light, said they described " a soldier who fit the description" of Pte England, as well as other soldiers involved in the night shift when the abuse allegedly happened, including her boyfriend, Spc Charles Graner.
He said the prisoners had not given any evidence that senior officers or military intelligence (MI) were involved.
England was involved in some of the most infamous photos (AP Photo/Courtesy of The New Yorker)
"The detainees were very specific about the guards who were there," he told the pre-trial hearing by telephone.
Several criminal investigators have said they discovered no evidence of military intelligence officers ordering prisoners be abused.
But during the third day of the four-day hearing in North Carolina, Pte England's lawyers continued to ask how much control MI officers had at the prison.
Captain Brent Fitch told the hearing via telephone that he had seen a photograph that showed three military intelligence officers abusing a detainee, the AFP news agency reported.
He also testified that MI officers sometimes wore "sanitised" uniforms so detainees could not identify their interrogators.
Pte England's defence team are trying to show she was just following orders and has been made a scapegoat for a scandal that provoked fury in the Arab world.
But the army insists she and some of her colleagues decided themselves to abuse and sexually humiliate the prisoners.
To back its argument, the prosecution has called witnesses who have described Pte England as undisciplined and promiscuous.
Pte England faces charges of conspiracy to mistreat Iraqi prisoners, assaulting prisoners, committing acts prejudicial to good order, committing indecent acts, disobeying an order and creating and possessing sexually explicit photographs.
If convicted, she could face up to 38 years in prison.