The Army has opened a criminal investigation into injuries suffered by a soldier who was posing as an uncooperative detainee during training with military police at Guantanamo Bay (search), the soldier's attorney said Monday.

Sean Baker, who was a specialist in a military police unit, suffers from seizures he blames on a head injury from the training session in January 2003 at the base in Cuba. He received a medical discharge in April and returned home to Georgetown in central Kentucky.

Baker's lawyer, Bruce Simpson, said he was notified recently that the Army had begun a criminal investigation into the case. He said military investigators are scheduled to meet with Baker on Wednesday.

Officials at the Pentagon and at Southern Command (search) in Miami would not confirm whether any investigation was under way.

Baker posed as an uncooperative detainee during the training exercise with the Michigan-based 303rd Military Police Company (search). He has said military police officers beat and choked him and slammed his head against the floor at the detention center, where the U.S. government holds suspected terrorists.

In a letter to the Army, U.S. Rep. Ben Chandler urged the military to turn over medical records to Baker's lawyer and called Baker's claims "deeply troubling."

"Any delay in producing medical records in a situation such as this would be difficult to understand or accept," wrote Chandler, D-Ky.

Baker is scheduled to undergo two days of evaluations with a private physician next month. He was a member of the 438th Military Police Company, based in Murray, Ky., when it deployed to Guantanamo Bay last year.

An Army spokeswoman at Southern Command said last week that a previous investigation concluded Baker's injuries occurred in the "line of duty," and none of the soldiers involved were disciplined.

The Army also initially said Baker's discharge was unrelated to his injuries but later acknowledged they were a factor.