The National Weather Service issued flash flood warnings for many parts of Oklahoma, and the entire state was under a flash flood watch.

At least one person died in a vehicle submerged by water from a swollen creek in Killeen, north of Austin, the National Weather Service reported. Elsewhere, authorities were searching for an unknown number of possible victims, said Williamson County sheriff’s Sgt. John Foster.

Foster had no reports of deaths or injuries in his county but he said authorities “were kind of preparing for the worst.” Texas Parks and Wildlife Department game wardens were assisting in the search. The wardens reported rescues of nine people in Belton and four in Williamson County. Officials also said a state helicopter had been deployed to search for missing people near Lake Granger, north of Austin.

The emergency response came as the remnants of Hermine dumped several inches of rain across central and north Texas overnight, snarling the morning commute in the Dallas area. Flood warnings were posted throughout both regions.

Students at Bear Creek Intermediate School in Keller, located just north of Fort Worth, were evacuated Wednesday morning to a church because of rising floodwaters along Bear Creek. The district’s website said that all of the students were safely transported to the church and will have a regular school day there.

Residents of an apartment complex in Arlington, near Dallas, took refuge on their rooftops after being trapped by flood waters. They were rescued by fire department personnel using a ladder truck. The storm created flash floods that have closed roads, public buildings and left some people stranded in the Dallas-Fort Worth area.

The storm brought winds gusting to about 70 mph and downpours to Texas but left only minor scrapes in the storm-weary Rio Grande Valley, which is proving resilient this hurricane season after taking a third tropical system on the chin.

The storm struck the flood-prone valley just after the cleanup finished from Hurricane Alex at the start of the summer and an unnamed tropical depression in July. Only last week had Hidalgo County on the U.S.-Mexico border stowed its last water pump.

But Hermine’s remnants were expected to cover more of the U.S. than Alex, which swiped Texas in June as a Category 1 storm before plunging southwest and breaking up over Mexico.

“This is going to be much more of a memorable storm than Alex,” National Weather Service meteorologist Joseph Tomaselli said.

The Coast Guard said it received multiple reports of vessels in distress late Monday and early Tuesday. Coast Guard crews and other officials had to rescue 17 crew members and a dog from three other fishing vessels that got stuck near the South Padre Island beach in South Texas. All were treated for minor injuries, the Coast Guard said Tuesday.

Mexico felt the storm effects much more acutely than Texas on Tuesday as Hermine knocked out power for several hours in the border city of Matamoros and damaged about 20 homes, whose inhabitants were among 3,500 people who evacuated to shelters.

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Associated Press Writers Jamie Stengle, Terry Wallace, Danny Robbins and Schuyler Dixon in Dallas contributed to this report. Jay Root reported from Austin.

The U.S. prison population dropped steadily during most of the 1960s, and there were a few small dips in 1970 and 1972. But it has risen every year since, according to the Bureau of Justice Statistics.

About 739,000 prisoners were admitted to state and federal facilities last year, about 3,500 more than were released, according to new figures from the bureau. The 0.8 percent growth in the prison population is the smallest annual increase this decade and significantly less than the 6.5 percent average annual growth of the 1990s.

Overall, there were 1.6 million prisoners in state and federal prisons at the end of 2008.

In the past, prison populations have been lower when drafts were enacted, including during World War II and the wars in Korea and Vietnam.

“People who go to war are young men, and young men are the most likely to get arrested or prosecuted,” said James Austin, president of the JFA Institute, a research organization that advises states on prison issues.

The ongoing wars in Iraq and Afghanistan haven’t involved in a draft.

Instead, the economic crisis forced states to reconsider who they put behind bars and how long they kept them there, said Kim English, research director for the Colorado Division of Criminal Justice.

In Texas, parole rates were once among the lowest in the nation, with as few as 15 percent of inmates being granted release as recently as five years ago. Now, the parole rate is more than 30 percent after Texas began identifying low-risk candidates for parole.

In Mississippi, a truth-in-sentencing law required drug offenders to serve 85 percent of their sentences. That’s been reduced to less than 25 percent.

California’s budget problems are expected to result in the release of 37,000 inmates in the next two years. The state also is under a federal court order to shed 40,000 inmates because its prisons are so overcrowded that they are no longer constitutional, Austin said.

States also are looking at ways to keep people from ever entering prison. A nationwide system of drug courts takes first-time felony offenders caught with less than a gram of illegal drugs and sets up a monitoring team to help with case management and therapy.

Studies have touted significant savings with drug courts, saying they cost 10 percent to 30 percent less than it costs to send someone to prison.

“I don’t think they work. I know so,” said Judge John Creuzot, a state district judge in Dallas.

The reforms in many state prisons and courts come even as crime rates continue to drop nationwide.

“It’s economically driven, but the science is there to support it,” Austin said. “They are saving money, but not doing it in a way that jeopardizes public safety.”

One exception to the trend is Florida, which has enacted a law requiring all convicts to serve a high percentage of their sentences. The law is straining the state’s prison resources.

“They know that they are stuck in a time bomb they can’t get out of,” Austin said.

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 priority in terms of ascertaining what motivations he had.”

Officials at the post hospital where Hasan worked said they weren’t aware of any problems 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.

She described Hasan as “a quiet man who wouldn’t seek the limelight.”

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.

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.

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 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 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

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Baker reported from Killeen, Texas. Associated Press Writers Lara Jakes, Devlin Barrett, Brett J. Blackledge and Eileen Sullivan in Washington, April Castro in Killeen and Matt Curry in Dallas contributed to this report.