• NOVEMBER 8, 2009, 1:05 P.M. ET

"We don't know enough to say now, but there are very, very strong warning signs here that Dr. Hasan had become an Islamist extremist and, therefore, that this was a terrorist act," Mr. Lieberman added.

The lawmaker said he would begin a Senate investigation aimed at uncovering Mr. Hasan's motives and asking "whether the Army missed warning signs." He also called on the Pentagon to begin an independent investigation to determine whether "warning signs were missed."

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Mr. Lieberman said preliminary evidence suggested that Mr. Hasan had denounced the U.S. wars in Iraq and Afghanistan. "In the U.S. Army, this is not a matter of constitutional freedom of speech," the senator said. "If Hasan was showing signs, saying to people that he had become an Islamist extremist, the U.S. Army has to have zero tolerance. He should have been gone."

Gen. Casey said the Army was conducting an investigation to try to determine the motivation behind the shootings. "We in the Army will take a very hard look at ourselves and ask ourselves some very hard questions," he said.

He expressed concern that speculation about the shooting could result in a "backlash" against Muslim soldiers. "What happened at Fort Hood was a tragedy, but I believe it would be an even-greater tragedy if our diversity becomes a casualty here," he said. "We have a very diverse army. We have a very diverse society. And that gives us all strength."

Gen. Casey said the Army has taken steps to help identify and help soldiers with mental health issues in an effort to prevent repeats of the shooting at Fort Hood. He said the Army encouraged members of the military to seek treatment for post-traumatic stress.

The Army has also partnered with the National Institute for Health on a $50 million study of suicide, and has a $125 million program aimed at giving soldiers and their family members the "resilient skills they need to make it through these tough times," the general said.

Write to Brody Mullins at brody.mullins@wsj.com

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