WASHINGTON (AP) - The chairman of the Senate Homeland Security Committee says he plans to begin a congressional investigation of the shootings at Fort Hood.
An Army major, Nidal Malik Hasan is suspected of killing 13 people and wounding 29 others at the Army post in Texas.
Sen. Joe Lieberman says he wants to determine whether the shootings constitute a terrorist attack. He says he also wants to find out whether the Army missed warning signs that Hasan was becoming extreme in his Islamist views.
The Connecticut independent says if Hasan was showing signs of becoming an Islamist radical, the Army should have shown "zero tolerance" and discharged him.
Lieberman appeared on "Fox News Sunday."
The Army's chief of staff says the Army is taking a hard look at itself to make certain that something like the Fort Hood rampage doesn't happen again.
The shootings left 13 dead and 29 wounded. The alleged gunman, Maj. Nidal Malik Hasan, was wounded by civilian police.
Gen. George Casey warns against reaching conclusions about motives until investigators have fully explored the attack. Early reports suggest Hasan, a Muslim, was angry about the wars in Afghanistan and Iraq and worried about his pending deployment to Afghanistan.
But Casey says focusing on Hasan's Islamic roots could "heighten the backlash" against all Muslims in the military and he's instructed his commanders to be on the lookout for it. He says the military's diversity gives it strength.
While declining to answer questions about the investigation, Casey says evidence to this point shows that Hasan acted alone.
Casey appeared on ABC's "This Week," NBC's "Meet the Press," and CNN's "State of the Union."
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