'Connecticut school shooter Adam Lanza and his mother visited gun ranges'
- China says no to Arunachal youth in India delegation, minister says letâs call off trip
- Lok Sabha polls: Tamizh Talkies
- BJP leader to Narendra Modi critics: You will soon be in Pakistan, not India
- The Third Front: Why transgenders remain a minority in election process
- Elections LIVE 2014: BJP disapproves Giriraj Singh's Pakistan remark
Police are yet to disclose a motive for the attack – which left those who knew Lanza trying to discern whether anything in his past could have foreshadowed the present, CNN reported.
Lanza moved to Connecticut from Kingston, New Hampshire, with his parents and older brother Ryan, according to a booklet for the town's Newtown's Bennetts Farm neighbourhood. He enjoyed soccer, skateboarding and video games, the publication said.
In September 2009 – when Lanza was 17 – his mother and father divorced, court documents show.
What happened after that for him isn't clear, except that he continued to lived in the picturesque, 300-year-old Connecticut town.
His father, Peter, remarried and lived not far from Newtown, an official said. He was questioned by authorities after the shooting. So, too, was Adam's 24-year-old brother, Ryan.
Lanza's father was also at a loss for explanation. He sent his condolences to the families of victims in a statement released Saturday.
"Our family is grieving along with all those who have been affected by this enormous tragedy," Peter Lanza said.
"No words can truly express how heartbroken we are. We are in a state of disbelief and trying to find whatever answers we can," he said.
"On behalf of Nancy's mother and siblings we reach out to the community of Newtown and express our heartfelt sorrow for the incomprehensible and profound loss of innocence that has affected so many," he added.
Authorities have offered few details about Adam Lanza. He had no known criminal record, a law enforcement official said.
One of Lanza's aunts, Marsha, described him as a "quiet, nice kid" who had issues with learning, she said. Her husband is Lanza's paternal uncle.
"He was definitely the challenge of the family in that house. Every family has one," she told CNN affiliate WLS. "They have one. I have one. But never in trouble with the law, never in trouble with anything."