[PHOTOS: Images from Thursday's tragic shooting at Ft. Hood]
[MAP: Ft. Hood in Killeen]
[MASS SHOOTINGS: Timline of mass shootings in the U.S.]
The neighbor, Patricia Villa, said Maj. Nidal Malik Hasan came over to her apartment Wednesday and Thursday and offered her some items, including a new Quran, saying he was going to be deployed on Friday. She wasn't sure if he was going to Iraq or Afghanistan.
Authorities said Hasan went on a shooting spree later Thursday at the sprawling Texas post. He was among 30 people wounded in the spree and remained hospitalized on a ventilator Friday. All but two of the injured were still hospitalized, and all were in stable condition.
Investigators were still trying to piecing together how and why an Army psychiatrist facing deployment allegedly gunned down his comrades in one of the worst mass shootings ever on an American military base.
"This was an individual who took it upon himself to attack and murder his colleagues, people who were on the base with him," Homeland Security Secretary Janet Napolitano told Sky News from Brussels, Belgium. "That investigation is under way by law enforcement authorities, and let's let that be the No. 1 priorty in terms of ascertaining what motivations he had."
An imam from a mosque Hasan regularly attended said Hasan, a lifelong Muslim, was a committed soldier, gave no sign of extremist beliefs and regularly wore his uniform at prayers.
Soldiers who witnessed the rampage reported that the gunman shouted "Allahu Akbar!" -- an Arabic phrase for "God is great!" -- before opening fire, said Lt. Gen. Robert Cone, the base commander. He said officials had not yet confirmed that Hasan made the comment before the shooting spree.
Villa, who recently moved next door to Hasan, said she had never spoken to him before he came over to her apartment.
She said Hasan gave her frozen broccoli, spinach, T-shirts and shelves on Wednesday, then returned Thursday morning and gave her his air mattress, several briefcases and a desk lamp. He then offered her $60 to clean his apartment Friday morning, after he was supposed to leave.
The motive for the shooting wasn't clear, but someone who used to work with Hasan said he had expressed some anger about the wars in Iraq and Afghanistan.
Retired Col. Terry Lee told Fox News said Hasan had hoped President Barack Obama would pull troops out of Afghanistan and Iraq and got into frequent arguments with others in the military who supported the wars.
But another neighbor said Hasan appeared to be OK with his pending deployment, which he said was supposed to be to Afghanistan.
"I asked him how he felt about going over there, with their religion and everything, and he said, `It's going to be interesting,"' said Edgar Booker, a 58-year-old retired soldier who now works in a cafeteria on the post.
Col. Steve Braverman, the Fort Hood hospital commander, said early Friday that Hasan was on deployment orders to Afghanistan. A military official later told The Associated Press that Hasan was to be deployed to Iraq. It was not immediately possible to verify the discrepancy.
The military official, who did not have authorization to discuss the matter publicly and spoke to the AP on condition of anonymity, said Hasan had indicated he didn't want to go to Iraq but was willing to serve in Afghanistan.
Cone said authorities have not yet been able to talk to Hasan, but interviews with witnesses went through the night.
As some of the wounded began to recover, tales of heroic action during the shooting spree emerged.
Base officials lauded an officer, Kimberly Munley, who shot the gunman and was wounded herself.
"She happened to encounter the gunman. In an exchange of gunfire, she was wounded but managed to wound him four times," Cone said. "It was an amazing and aggressive performance by this police officer."
Cone said some 300 soldiers had been lined up to get vaccinations and have their eyes tested at a Soldier Readiness Center when the shots rang out. He said one soldier who had been shot told him, "I made the mistake of moving and I was shot again."
Sgt. Andrew Hagerman said before the first ambulance even arrived, soldiers were tearing off their clothes to help the wounded.
"You had people without tops on. You had people ripping their pant legs off," said Hagerman, a military policeman from Lewisville, Texas.
Hagerman said he saw Hasan laying on the ground receiving medical assistance for a gunshot wound as responders tried to get his handcuffs off to better treat him.
Officials are not ruling out the possibility that some of the casualties may have been victims of "friendly fire," that in the confusion at the shooting scene some of the responding military officials may have shot some of the victims.
Cone acknowledged that it was "counterintuitive" that a single shooter could hit so many people, but he said the massacre occurred in "close quarters.
"With ricochet fire, he was able to injure that number of people," Cone said. He said authorities were investigating whether Hasan's weapons were properly registered with the military.
The gunfire broke out around 1:30 p.m. Nearby, some soldiers were readying to head into a graduation ceremony for troops and families who had recently earned degrees.
"I was confused and just shocked," said Spc. Jerry Richard, 27, who works at the center but was not on duty during the shooting. "Overseas you are ready for it. But here you can't even defend yourself."
The wounded were dispersed among hospitals in central Texas, Cone said. Their identities and the identities of the dead were not immediately released.
Friday was designated a day of mourning at Fort Hood. There also will be a ceremony at the air base to honor the dead.
For six years before reporting for duty at the Texas post in July, Hasan worked at the Walter Reed Army Medical Center pursuing a career in psychiatry, as an intern, a resident and, last year, a fellow in disaster and preventive psychiatry. The 39-year-old Army major received his medical degree from the military's Uniformed Services University of the Health Sciences in Bethesda, Md., in 2001.
But his record wasn't sterling. At Walter Reed, he received a poor performance evaluation, according to an official who spoke on condition of anonymity because he was not authorized to discuss the case publicly. And while he was an intern, Hasan had some "difficulties" that required counseling and extra supervision, said Dr. Thomas Grieger, who was the training director at the time.
Faizul Khan, a former imam at a mosque Hasan attended in Silver Spring, Md., said "I got the impression that he was a committed soldier." He said Hasan attended prayers regularly at the mosque in Silver Spring, Md., and was a lifelong Muslim. He spoke often with Hasan about Hasan's desire for a wife.
In an interview with The Washington Post, Hasan's aunt, Noel Hasan of Falls Church, Va., said he had been harassed about being a Muslim in the years after the Sept. 11, 2001, terror attacks, and he wanted out of the Army.
"Some people can take it and some people cannot," she said. "He had listened to all of that and he wanted out of the military."
At least six months ago, Hasan came to the attention of law enforcement officials because of Internet postings about suicide bombings and other threats, including posts that equated suicide bombers to soldiers who throw themselves on a grenade to save the lives of their comrades.
Investigators had not determined for certain whether Hasan was the author of the posting, and a formal investigation had not been opened before the shooting, said law enforcement officials who spoke on condition of anonymity because they are not authorized to discuss the case.
FBI agents who searched Hasan's apartment early Friday seized his computer, a law enforcement official said. It was not immediately known if they found anything suspicious on his computer files.
A military official said investigators were sifting through materials Hasan carried with him during the shooting and evidence left in his vehicle, which was found parked at the base. The officials spoke on condition of anonymity because of the ongoing investigation
------ Baker reported from Killeen, Texas. Associated Press Writers Lara Jakes, Devlin Barrett and Brett J. Blackledge in Washington, April Castro in Killeen and Matt Curry in Dallas contributed to this report. "I'm not aware of any problems here," said Col. Steve Braverman, the Fort Hood hospital commander. "We had no problems with his job performance."
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