The Pentagon is planning a military-wide investigation after the Fort Hood shootings.
    
The defense department will examine how the military keeps watch on potential problems in their ranks.
    
A Pentagon official said the issues raised by the accused shooter, Maj. Nidal Hassan, are larger than the Army.

Investigators of the massacre say it appears alleged shooter Hasan rehearsed the attack that left 13 people dead and scores of others wounded.

Two days before the Nov. 5 shooting spree, Hasan went to a shooting range and fired as many as 200 rounds into 10 targets.

The day before the shooting he closed out his bank account and told the teller, "You'll never see me again."

"This is the final hurrah for him," former FBI Special Agent Brad Garrett said. "He knows he is going to die or he hopes that he will die that day."

Investigators also say Hasan tried to get military prosecutors to charge some of his patients with war crimes in Afghanistan and Iraq, but those attempts failed.

Meanwhile, the Army is planning to launch an internal probe to examine whether it missed warnings that may have prevented the massacre, according to the Wall Street Journal. President Obama has already called for examination of all intelligence related to Hasan.