FORT HOOD, Texas (AP) -- Soldiers who witnessed the shooting rampage at Fort Hood that left 13 people dead reported that the gunman shouted "Allahu Akbar!" -- an Arabic phrase for "God is great!" -- before opening fire, the base commander said Friday.

Lt. Gen. Robert Cone said officials had not yet confirmed that the suspected shooter, Maj. Nidal Malik Hasan, made the comment before the rampage Thursday. Hasan was among 30 people wounded in the shooting spree and remained hospitalized on a ventilator.

All but two of the injured were still hospitalized, and all were in stable condition.

Military officials were trying to piece together what may have pushed Hasan, an Army psychiatrist trained to help soldiers in distress, to turn on his comrades. Cone said the 39-year-old Hasan was not known to be a threat or risk.