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[Updated Nov. 26, 2013, at 12:30 p.m., Eastern time.]

A Connecticut state attorney鈥檚 report drew pointed conclusions about the shootings at Sandy Hook Elementary School that shook the nation a year ago, saying Adam Lanza acted alone in killing 26 students and staff, that the attack was premeditated, and that police and school staff 鈥渁cted heroically鈥� in responding to the tragedy.

The report also pulled together details of Mr. Lanza鈥檚 reclusive lifestyle and his troubled interactions with others.

But in summing up a months-long investigation, Stephen Sedensky of the state鈥檚 Danbury district also left big questions unanswered.

The report said Lanza鈥檚 motive remains unclear. Lanza faced mental-health challenges, and had 鈥渁 fascination with mass shootings and firearms, [but] displayed no aggressive or threatening tendencies,鈥� it said.

And the report does little to answer larger questions about how to avoid similar tragedies in the future. It focused instead on an investigation designed to bring perpetrators to justice, and it concluded that Lanza had no accomplices.

The shootings on Dec. 14, 2012, brought grief and soul-searching not only to the community of Newtown, Conn., but also to the nation. What more should be done to protect schools, to better control access to weapons such as semiautomatic rifles (Lanza used one), and to address mental-health problems that can contribute to violence?

The Sandy Hook tragedy involved a perpetrator who combined what the report called 鈥渟ignificant mental health issues鈥� with easy access to firearms and ammunition purchased by his mother, the only person with whom he seemed to have a close relationship, and whom he also killed that day. Lanza killed himself as police arrived on the scene.

Some details from the report:

• He became progressively more isolated. 鈥淥ver the years his mother consistently described the shooter as having Asperger鈥檚 syndrome,鈥� which is considered a form of autism that includes difficulties with social interaction. Over time, he withdrew from sports and a school band. Contact with his brother appears to have ended in 2010. That was also the last year that his father saw him. The father and mother separated in 2001.

• Lanza lived with his mother, but wouldn鈥檛 allow her into his room. She 鈥渢ook care of all of the shooter鈥檚 needs鈥� such as food and laundry, but 鈥渙ne witness indicated that the shooter did not have an emotional connection to his mother.鈥�

• Daily routine, which appears to be particularly important to many people diagnosed with Asperger's, may have seemed at risk. The report doesn鈥檛 put听 it that way, but it notes that by late 2012, the mother, Nancy Lanza, had voiced plans to sell her home in Newtown and move to Washington State or North Carolina. 鈥淪he reportedly had told the shooter of this plan and he apparently stated that he wanted to move to Washington,鈥� where he might go to a 鈥渟pecial school,鈥� the report said. Whatever the reasons, Adam Lanza had evolved into a highly particular person, unwilling to sleep in a motel and insistent that "certain types of dishware could not be used for particular foods."

• The report found no evidence of drug use by Lanza, noting that he did not drink alcohol 鈥渁nd hated the thought鈥� of taking drugs.

• He was active in video gaming, including some violent games such as 鈥淐ombat Arms鈥� and 鈥淲orld of Warcraft.鈥� But according to the report, he was most involved in 鈥淒ance Dance Revolution,鈥� a game that involved standing on a platform and moving his feet as directed by a video. He played the game both at home and in public at a local theater 鈥� where his sessions could last for hours, a couple of times per week. According to the report those trips to the theater continued 鈥渦p until a month before December 14, 2012.鈥�

• Lanza appears to have used or transported five different firearms on the day of the killings. On the morning of Dec. 14, the report concluded, he killed his mother using a Savage Mark II rifle. Then he drove to the elementary school, where he used a Bushmaster Model XM15-E2S semiautomatic rifle in the slaying of six administrators or teachers and 20 first graders. He used a Glock 20 semiautomatic pistol to take his own life. Another semiautomatic pistol (unfired) was found on his person and a semiautomatic shotgun (unfired) was found in the car he used.

• His mother was an avid user of firearms and encouraged his interest. The five guns 鈥渨ere legally purchased by the shooter鈥檚 mother,鈥� the report says, and 鈥渢here is no evidence that the ammunition was purchased by anyone else鈥� other than her. It said she 鈥渨anted to buy the shooter a CZ 83 pistol for Christmas.鈥�

• The report downplays bullying as a possible influence on Lanza. Although 鈥渢he shooter鈥檚 mother and father indicated that the shooter was bullied growing up,鈥� multiple other witnesses, including former teachers, contradict that view. The report drew on interviews with numerous people, including Lanza鈥檚 father and brother as well as former peers.