KILLEEN, Texas - An Army psychiatrist suspected of opening fire on fellow soldiers at Fort Hood cleaned out his apartment and left a phone message saying goodbye to a friend in the days before the rampage that left 13 people dead , neighbors said Friday.
One 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.
Authorities said the 39-year-old Hasan went on a shooting spree later Thursday at the sprawling Texas post. He was among 30 people wounded in the rampage and remained hospitalized Friday in a coma , attached to a ventilator. All but two of the injured were still hospitalized; all were in stable condition.
Investigators were trying to piece together how and why Hasan allegedly gunned down his comrades in one of the worst mass shootings ever on an American military base. Though his motive wasn't known, some who knew Hasan said he may have been struggling with a pending deployment to Afghanistan and faced pressure in his work with distressed soldiers .
Hasan's family said in a statement Friday that his alleged actions were "despicable and deplorable" and don't reflect how the family was raised.
President Barack Obama ordered the flags at the White House and other federal buildings be at half-staff and urged people not to draw conclusions while authorities investigate.
"We don't know all the answers yet. And I would caution against jumping to conclusions until we have all the facts," Obama said in a statement.
A moment of silence was held Friday afternoon at Fort Hood and other U.S. military bases as a show of respect for the victims. Army Chief of Staff George Casey said about 20 different units were affected by the shooting.
"I've asked our leaders around the country to look at their installations, to look at what's going on and to adjust their force protection measures to deal with it," Casey said.
The shooting spree began as some 300 soldiers had been lined up to get vaccinations and have their eyes tested at a Soldier Readiness Center, where troops who are about to be deployed or who are returning undergo medical screening. Nearby, others were lining up in commencement robes for a ceremony to celebrate soldiers and families who had recently earned degrees.
Soldiers reported that the gunman shouted "Allahu Akbar!" -- Arabic for "God is great!" -- before opening fire, said Lt. Gen. Robert Cone, the base commander. He said officials had not confirmed that Hasan made the comment.
Officials are not ruling out the possibility that some of the casualties may have been victims of "friendly fire," shot by responding military officials.
When the gunfire subsided, soldiers described a scene that looked like a war zone : too many wounded to count, shells and blood on the floor, and comrades ripping off their clothes to make tourniquets to keep the injured alive. One woman, suffering from a wound to the hip, carried another victim to get help.
"You had people without tops on. You had people ripping their pant legs off," said Sgt. Andrew Hagerman, a military police officer from Lewisville, Texas.
Hagerman arrived at the scene minutes after the shooting stopped. When he entered the building, he kept his head down to avoid stepping in the pools of blood or kicking any spent shell casings.
"You could go around it," he said. "There was definitely a path."
The gunman was struck four times by a civilian police officer who was wounded herself. Base officials said Kimberly Munley fired on the suspect just three minutes after the gunfire erupted and that her efforts ended the crisis. Munley was recovering Friday at a hospital.
"It was an amazing and aggressive performance by this police officer," Cone said.
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.
Hasan reported for duty at Fort Hood in July, after working at Walter Reed Army Medical Center in Washington for six years. Though he apparently had problems at Walter Reed , Fort Hood officials said they weren't aware of any issues with his job performance.
One of Hasan's bosses praised his work ethic and said he provided excellent care for his patients.
"Up to this point I would consider him an asset," said Col. Kimberly Kesling, deputy commander of clinical services at Darnall Army Medical Center.
Neighbors described a man who appeared to be getting his affairs in order just hours before the shooting. Hasan was set to deploy to Afghanistan with an Army Reserve unit that provides what the military calls "behavioral health" counseling, Army spokeswoman Col. Cathy Abbott said.
Villa, who moved next door to Hasan about a month ago, 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,