Soldier-On-Soldier Shooting Suspect Had Been Disarmed After Earlier Incident

Army Times: The Real Story Of What Happened

**UPDATE*** The Associated Press reveals more details about the shooter:
The suspect had been disarmed after an earlier incident at the center but returned with another weapon, according to a senior military official in Washington, who spoke on condition of anonymity because the investigation into the shootings was ongoing. LinkHere

Update: Obama 'shocked' at soldier who killed 5 colleagues

Stressed out US soldier shoots fellow troops in Iraq

Massacre Puts War Trauma in Spotlight