Pfc. Steven D. Green was found to have "homicidal ideations" after seeking help from an Army Combat Stress Team in Iraq on Dec. 21, 2005. Green said he was angry about the war, desperate to avenge the death of comrades and driven to kill Iraqi citizens, according to an investigation by The Associated Press.

The treatment was several small doses of Seroquel a drug to regulate his mood and a directive to get some sleep, according to medical records obtained by the AP. The next day, he returned to duty in the particularly violent stretch of desert in the southern Baghdad suburbs known as the "Triangle of Death."

Green has been charged in federal court in the U.S. since he had been discharged and returned home before the charges were brought. Four of his accomplices are being charged in military proceedings.

Now the Army believes Green and four other soldiers are responsible. One of them has confessed and provided information to prosecutors; in testimony at his court-martial, the soldier identified Green as the ringleader.

If the charges are true, the attack would be among the most horrific instances of criminal behavior by American troops in the nearly four-year-old war. It also would represent a worst-case scenario for the military's much-criticized practice of keeping mentally and emotionally unfit personnel in the killing fields of Iraq.

Last Night in Little Rock had this to say about the Mahmoudiya killings.