An American soldier who is accused of killing five fellow troops at a counseling center in Iraq had been unraveling for nearly two weeks but the U.S. military lacked clear procedures to monitor him or deal with the deadly shooting spree once it began to unfold, a military report found.

The shootings at a U.S. base in Baghdad in May were the deadliest case of U.S. soldier-on-soldier violence of the six-year Iraq war. Sgt. John M. Russell, 44, was arrested and is the only person charged in the incident.

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