The following is a partial list of those investigated in the abuse of prisoners by U.S. troops at the Abu Ghraib prison in Iraq:

Criminally charged

Staff Sgt. Ivan L. "Chip" Frederick II of Buckingham, Va.
Frederick, 37, of the 372nd Military Police Company, was the senior enlisted soldier at Abu Ghraib prison between October and December of 2003, when the abuses are alleged to have occurred. He has been recommended for court-martial on criminal charges.
Before deployment in February 2003, Frederick was a corrections officer at Buckingham Correctional Center, a state prison in rural Dillwyn, Va., in the south-central part of the state. His wife, Martha, also works there.
Spc. Charles A. Graner Jr. of Uniontown, Pa.
Graner, 35, of the 372nd Military Police Company, faces a possible court-martial on criminal charges of maltreatment and indecent acts, according to his civilian attorney, Guy Womack. His Article 32 hearing, the military equivalent of a grand jury proceeding, has been completed, Womack said.
Before deployment in February 2003, he was a state prison officer in Greene County, Pa., in the southwestern part of the state, for seven years.
Spc. Sabrina D. Harman, of Lorton, Va.
Harman, of the 372nd Military Police Company, faces criminal charges and a possible court-martial. She is in the process of having an Article 32 hearing, the military equivalent of a grand jury proceeding, according to her mother, Robin M. Harman.
An Army report obtained by The New Yorker quotes testimony from Harman that her job was to keep detainees awake, including one hooded prisoner who was placed on a box with wires attached to his fingers, toes and genitals.
Harman has a civilian lawyer, Frank Spinner, a retired Air Force colonel from Colorado Springs, Colo., known for defending clients in high-profile military cases.
Spc. Jeremy C. Sivits of Hyndman, Pa.
Sivits, 24, a member of the 372nd Military Police Company, faces possible court-martial on criminal charges.
The Army trained Sivits as a truck mechanic, not as a prison officer, his father, Daniel Sivits said. He said his son "was just doing what he was told to do."
Capt. Donald J. Reese of New Stanton, Pa.
Reese was the 372nd's unit commander. He faces administrative charges, according to his wife, Sue.
Brig. Gen. Janis Karpinski
Karpinski was suspended from her position last month as commander of U.S.-run prisons in Iraq amid investigations into the claims of abuse. She is the commander of the 800th Military Police Brigade.
Admonished
1st Lt. Lewis C. Raeder, of Monrovia, Md.
Raeder, 28, a platoon leader in the 372nd Military Police Company, has been admonished for not training his troops on the Geneva Convention prohibiting mistreatment of prisoners of war and civilian detainees, according to his father, Lewis W. Raeder.
Spc. Lynndie England, of Fort Ashby, W.Va.
England, 21, of the 372nd Military Police Company was trained to be a "paper pusher" and process Iraqi prisoners, her family said.
England has not been charged and has been reassigned to Fort Bragg, N.C.