Fort Hood, Tex. ? As if going off to war, Maj. Nidal Malik Hasan cleaned out his apartment, gave leftover frozen broccoli to one neighbor and called another to thank him for his friendship — common courtesies and routines of the departing soldier. Instead, authorities say, he went on the killing spree that left 13 people dead.

Investigators examined Hasan’s computer, his home and his garbage Friday to learn what motivated the suspect, who lay in a coma, shot four times in the frantic bloodletting. Hospital officials said some of the wounded had extremely serious injuries and might not survive.

The 39-year-old Army psychiatrist emerged as a study in contradictions: a polite man who stewed with discontent, a counselor who needed to be counseled himself, a professional healer now suspected of cutting down the fellow soldiers he was sworn to help.

Relatives said he felt harassed because of his Muslim faith but did not embrace extremism. Others were not so sure. A recent classmate said Hasan once gave a jarring presentation to students in which he argued the war on terrorism was a war against Islam, and “made himself a lightning rod for things” when he felt his religious beliefs were challenged.

Looking for answers

Investigators were trying to piece together how and why Hasan allegedly gunned down his comrades in the worst case of violence on a military base in the U.S. The rampage unfolded at a center where some 300 unarmed soldiers were lined up for vaccines and eye tests.

Soldiers reported that the gunman shouted “Allahu Akbar!” — an Arabic phrase for “God is great!” — before opening fire Thursday, said Lt. Gen. Robert Cone, the post commander. He said officials had not confirmed Hasan made the comment.

Hasan’s family said in a statement Friday that his alleged actions were deplorable and don’t reflect how the family was reared.

“Our family is filled with grief for the victims and their families involved in yesterday’s tragedy,” said Nader Hasan, a cousin who lives in northern Virginia. “We are mortified with what has unfolded and there is no justification, whatsoever, for what happened. We are all asking why this happened, and the answer is that we simply do not know.”

The 30 wounded were dispersed among hospitals in central Texas. W. Roy Smythe, chairman of surgery at Scott and White Memorial Hospital, said several patients were still at “significant risk” of losing their lives.

At a news conference late Friday, Army Col. John Rossi, deputy commander at Fort Hood, said 23 people remained hospitalized, about half still in intensive care. He praised the soldiers’ quick actions during and after the shooting barrage, which he said saved lives.

Rossi said the assailant fired more than 100 rounds and that his weapons were not military arms, but “privately owned weapons … purchased locally.” Law enforcement sources in Washington, speaking on condition of anonymity, said records indicate Hasan in recent months bought the FN 5.7 pistol at a store called “Guns Galore” in Killeen, Texas.

The dead included a pregnant woman who was preparing to return home, a man who quit a furniture company job to join the military about a year ago, a newlywed who had served in Iraq and a woman who had vowed to take on Osama bin Laden after the Sept. 11 terrorist attacks.

Honoring the victims

In a vigil Friday night, husbands wrapped their arms around their wives, babies cried and old men in wheelchairs bowed their heads as several hundred people gathered at a stadium on the sprawling Army post, the country’s largest. It was the first gathering of the community since the killings.

“Remember to keep breathing … keep going,” Chaplain Douglas Carver told the crowd, many wearing fatigues and black berets.

Earlier, 13 flag-draped coffins departed for Dover Air Force Base and the military’s mortuary based in Delaware, Rossi said. Officials said the result of autopsies on the victims will be made available to the appropriate federal and military agencies that are probing Thursday’s shooting. They will determine if any of the victims might have been hit by friendly fire, something Rossi all but dismissed.

Hasan, meanwhile, was transferred Friday to the Brooke Army Medical Center at Fort Sam Houston in San Antonio. Rossi gave no update about his condition except to say he was “not able to converse.”

Army Chief of Staff George Casey said he asked bases around the country to assess their security. He also said he was worried about a backlash against the thousands of Muslim soldiers serving dutifully in uniform.

Hasan was due to be deployed to Afghanistan to help soldiers with combat stress, a task he’d done stateside with returning soldiers, the Army said. Army spokeswoman Col. Cathy Abbott was uncertain when Hasan was to leave but he was in the preparation stage of deployment, which can take months.

In any event, the major was saying goodbyes and dispensing belongings to neighbors.

Jose Padilla, the owner of Hasan’s apartment complex, said Hasan gave him notice two weeks ago that he was moving out this week.

Earlier this week, Hasan asked Padilla his native language. When Padilla said it was Spanish, Hasan immediately went up to his apartment to get him a Spanish-language Quran. Padilla said Hasan also refused to reclaim his deposit and last month’s rent, surrendering $400 that the major said should go to someone who needed it.

“I cannot comprehend that the enemy was among us,” Padilla said, as he teared up. “I feel a little guilt that I was basically giving housing to someone who is going to do so much destruction.”