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The shooting began around 1:30 p.m., when shots were fired at the base's Soldier Readiness Center, where soldiers who are about to be deployed or who are returning undergo medical screening, said Lt. Gen. Bob Cone at Fort Hood.
President Barack Obama called the shooting "a horrific outburst of violence." He said it is a tragedy to lose a soldier overseas and even more horrifying when they come under fire at an Army base on American soil.
"We will make sure that we get answers to every single question about this horrible incident," the commander in chief said in Washington. "We are going to stay on this."
A law enforcement official identified the shooting suspect as Army Maj. Nidal Malik Hasan. The official spoke on condition of anonymity because he was not authorized to discuss the case publicly.
It was unclear what the motive was, though it appeared he was upset about a scheduled deployment. U.S. Sen. Kay Bailey Hutchison said the Army major was about to deploy overseas, though it was unclear if he was headed to Iraq or Afghanistan and when he was scheduled to leave. Hutchison said she was told about the upcoming deployment by generals based at Fort Hood.
Retired Army Col. Terry Lee told Fox News that he worked with Hasan, who had hoped Obama would pull troops out of Afghanistan and Iraq. Lee said Hasan got into frequent arguments with others in the military who supported the wars, and had tried hard to prevent his pending deployment.
Military officials say Hasan, 39, was a psychiatrist at Walter Reed Army Medical Center for six years before being transferred to the Texas base in July. The officials, who had access to Hasan's military record, said he received a poor performance evaluation while at Walter Reed. The officials spoke on condition of anonymity because military records are confidential.
The Virginia-born soldier was single with no children. He graduated from Virginia Tech, where he was a member of the ROTC and earned a bachelor's degree in biochemistry in 1997. He received his medical degree from the military's Uniformed Services University of the Health Sciences in Bethesda, Md., in 2001. At Walter Reed, he did his internship, residency and a fellowship.
Officials were investigating whether Hasan was his birth name or if he may have changed his name, possibly as part of a conversion to Islam. However, they were not certain of his religion.
The Soldier Readiness Center holds hundreds of people and is one of the most populated parts of the base, said Steve Moore, a spokesman for III Corps at Fort Hood. Nearby there are barracks and a food center where there are fast food chains. The center is part of the largest active duty armored post in the United States. Covering 339 square miles, the post halfway between Austin and Waco was home to about 52,000 troops as of earlier this year.
A graduation ceremony for soldiers who finished college courses while deployed was going on nearby at the time of the shooting, said Sgt. Rebekah Lampman, a Fort Hood spokeswoman.
Greg Schanepp, Carter's regional director in Texas, was at Fort Hood, said John Stone, a spokesman for U.S. Rep. John Carter, whose district includes the Army post. Schanepp was at a graduation ceremony when a soldier who had been shot in the back came running toward him and alerted him of the shooting, Stone said. The soldier told Schanepp not to go in the direction of the shooter, he said.
Soldiers don't carry weapons with them unless they're doing training exercises, said Spc. Jerry Richard, 27, who works at the building where the shooting happened - though he was not on post at the time.
"Overseas you are ready for it. But here you can't even defend yourself," he said.
Two other soldiers taken into custody following the deadly rampage have been released, Fort Hood spokesman Christopher Haug said. "They're not believed to be involved in the incident," Haug said. He said a third person was in custody, however.
The wounded were dispersed among hospitals in central Texas, Cone said.
Lisa Pfund of Random Lake, Wis., says her daughter, 19-year-old Amber Bahr, was shot in the stomach but was in stable condition. "We know nothing, just that she was shot in the belly," Pfund told The Associated Press. She couldn't provide more details and only spoke with emergency personnel.
Pfund said Bahr joined the reserves when she was 17 to earn money for school and loved being in the military even though none of her friends were interested in joining the Army.
A Fort Hood spokesman said he could not immediately confirm any identities of the injured.
"I ask that all of you keep these families and these individuals in your prayers today," Texas Gov. Rick Perry said.
The shootings on the Texas military base stirred memories of other recent mass shootings in the United States, including 13 dead at a New York immigrant center in April, 10 killed during a gunman's rampage across Alabama in March and 32 killed in the deadliest mass shooting in modern U.S. history at Virginia Tech in 2007.
Around the country, some bases stepped up security precautions, but no others were locked down.
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Associated Press Writers Pam Hess, Anne Gearan, Lara Jakes, Suzanne Gamboa and Lolita C. Baldor in Washington, D.C., Jay Root in Temple, Linda Stewart Ball, Anabelle Garay and Andre Coe in Dallas and Colin Fly in Milwaukee and the Associated Press News Research Center contributed to this report. Barrett reported from Washington, D.C.
