Fort Hood Shootings: 12 Dead, 31 Injured On Texas Military Base (VIDEO)

This article will be periodically updated.

From the Washington Post:

An Army psychiatrist suspected of killing at least 12 people and wounding more than 30 in a shooting rampage at Fort Hood, Tex., on Thursday survived return fire from authorities and is in custody and hospitalized in stable condition.

Fort Hood's commanding general said earlier Thursday that the suspect in the shooting, identified as Maj. Malik Nidal Hasan, 39, was killed when a female civilian police officer returned fire, but Thursday night he corrected himself and said that Hasan was being treated at a hospital for unspecified wounds.

"The shooter is not dead but is in custody and in stable condition," Cone said, adding, "His death is not imminent."

Hasan formerly resided in the Washington area and practiced at Walter Reed Army Medical Center in the District, where he treated traumatized war veterans.

Army spokesmen said investigators were looking into a motive for the shooting rampage. Sen. Kay Bailey Hutchison (R-Tex.) said she was told that Hasan was upset about a looming deployment overseas, and a former Army colleague said Hasan opposed U.S. involvement in the wars in Iraq and Afghanistan.

President Obama called the incident "a horrific outburst of violence."

"These are men and women who have made the selfless and courageous decision to risk and, at times, give their lives to protect the rest of us on a daily basis," Obama said. "It's difficult enough when we lose these brave Americans in battles overseas. It is horrifying that they should come under fire at an Army base on American soil."

Army officials released no information about the victims on Thursday night. Nor would Cone elaborate much about the attack or Hasan's alleged involvement, rebuffing most requests from reporters for details.

The commander said that three other soldiers were detained as suspected accomplices but were later cleared of involvement. "We believe the evidence indicates that it was a single shooter," Cone said.

Hasan is a U.S.-born Muslim of Palestinian descent whose parents came to the United States from the West Bank. He joined the military after high school and earned medical degrees as he rose through the ranks, family members said.

A doctor in the Medical Corps, Hasan was promoted to major last year, according to the Congressional Record.

Hasan, 39, is a psychiatrist, according to acquaintances of his in Washington, and a Pentagon source said he was recently reassigned from Walter Reed Army Medical Center in Washington to work with soldiers at Darnall Army Medical Center at Fort Hood.

He previously lived in Montgomery County, Md., and Arlington, Va., in addition to Roanoke and nearby Vinton, Va. He graduated from Virginia Tech and earned his medical degree at Bethesda's Uniformed Services University of the Health Sciences, records show.

Hasan attended the Muslim Community Center in Silver Spring and was "very devout," according to Faizul Khan, a former imam at the center. Khan said Hasan attended prayers at least once a day, seven days a week, often in his Army fatigues.

Khan also said Hasan applied to an annual matrimonial seminar that matches Muslims looking for spouses. "I don't think he ever had a match, because he had too many conditions," Khan said.

"We never got into details of worldly affairs or politics," the former imam said of his conversations with Hasan. "Mostly religious questions. But there was nothing extremist in his questions. He never showed any frustration. . . . He never showed any . . . wish for vengeance on anybody."

However, a fellow Army officer who worked with Hasan told Fox News Channel that the psychiatrist had expressed strong opposition to the wars in Iraq and Afghanistan.