NBC's Pete Williams has more information on a report that Connecticut school shooter Adam Lanza may have been involved in an altercation with staff members at Sandy Hook Elementary one day before the murders.
Undated photo confirmed by government officials to be Adam Lanza, who apparently killed himself after killing more than two dozen others, including 20 school children.
A day after the Newtown massacre, gunman Adam Lanza’s motive – and any personal demons – remained a mystery.
Lanza, 20, was identified by authorities as the black-clad killer who fatally shot his mother, gunned down 26 children and adults at Sandy Hook Elementary School, and then committed suicide on Friday.
His older brother told authorities Lanza had a history of mental problems, but the nature of them was not clear. Former classmates remembered him as a brainy and quiet teen who sometimes wore a pocket protector.
Tim Arnone told Reuters that he first met Lanza at Sandy Hook and attended Newtown High School with him, where the two were members of a technology club. He said Lanza was "driven hard" to succeed academically by his parents, particularly his mother.
Nancy Lanza and her husband, Peter Lanza, divorced in 2008, according to public records. Peter Lanza could not immediately be reached for comment but has spoken to police.
Joshua Milas, who graduated from Newtown High School in 2009, told The Associated Press that Adam Lanza was generally a happy person but that he hadn't seen him in a few years.
"We would hang out, and he was a good kid. He was smart," Joshua Milas said. "He was probably one of the smartest kids I know."
Catherine Urso, of Newtown, told the Associated Press her college-age son knew Lanza. "He just said he was very thin, very remote and was one of the Goths," she said.
Law enforcement officials initially told NBC News that the gunman was Lanza's brother, Ryan, and they had sent out a bulletin to local and federal law enforcement agencies to that effect.
But when authorities went to Ryan's home in Hoboken, N.J., to search it, they unexpectedly found him there.
Ryan told police he was not involved and that his brother has a history of mental health issues and might have had his ID even though they had not seen each other in two years, officials said.
A senior official later said that Ryan was nowhere near the shooting, was not believed to be involved, and was cooperating with the investigation.
Lanza's aunt, Marsha Lanza, of Crystal Lake, Ill., told the AP she was close with Adam Lanza's mother and sent her a Facebook message Friday morning asking how she was doing. Nancy Lanza never responded.
Marsha Lanza described Nancy Lanza as a good mother and kind-hearted. She said her husband saw Adam Lanza as recently as June and recalled nothing out of the ordinary about him.
Nancy Lanza’s mother was too distraught to speak when reached by phone at her home in Brooksville, Fla., the AP reported.
"I just don't know, and I can't make a comment right now," Dorothy Hanson, 78, said in a shaky voice as she started to cry.
NBC News Justice Correspondent Pete Williams contributed to this report.
Authorities are investigating why the alleged gunman would have killed his mother at home and then killed so many children. NBC's Pei-Sze Cheng reports.
Related content from NBCNews.com:
Follow US news from NBCNews.com on Twitter and Facebook
Police outside the school shortly after arriving on scene of the shooting December 14. Hackers claiming to be associated with the internet activist group Anonymous have attacked the website belonging to the  (WBC) and hacked into the  account belonging to , the Church's spokeswoman. The attacks are part of an operation dubbed '#OpWestBor' on Twitter and is in response to the Church's decision to picket funerals of victims of the December 14 shooting at  in , Connecticut.

"Westboro will picket Sandy Hook Elementary School to sing praise to God for the glory of his work in executing his judgment," said Phelps in a post to her Twitter account on Saturday.

On Sunday, in a video posted on , Anonymous announced their intentions saying, "From the time you have received this message, our attack protocol has past been executed and your downfall is underway. Do not attempt to delude yourselves into thinking you can escape our reach, for we are everywhere, and all-seeing, in the same sense as God. ... We will render you obsolete. We will destroy you. We are coming." The Church's website has been unreachable for most of the day. At the time of this report, the website was unreachable. As a result of the breach, Anonymous claims to have gained access to and leaked alleged personal information such as names, home addresses and telephone numbers belonging to Church members.

Also as part of the operation, early yesterday morning, a member of Anonymous called 'CosmoTheGod' hacked the Twitter account belonging to Phelps, posting a 'tweet' saying, "This account is now being ran by @CosmoTheGod #UGNazi #oops." As of this report, Anonymous still has control of it.

This isn't the first time hackers took control of the Church's website. In 2011 the Church blamed Anonymous for circulating a letter claiming an attack on the Church's website was imminent and blamed them for taking down their website in an earlier attack, something the group denied. Shortly after the incident, user "th3j3st3r" on Twitter claimed responsibility for circulating the letter and the initial attack. When Phelps and one of the group's members were interviewed on live television shortly thereafter, she denied hackers could break into their website or take it offline. However; during the interview, Anonymous hacked into the Church's website, defaced it and took it offline.

"I was just going to say in the time that Shirley was blabbing her religious preachings I actually did some business and I think if you check downloads.westborobaptistchurch right now you’ll see a nice message from Anonymous", said Anonymous nine minutes into the interview.

On December 14, a gunman identified as 20 year-old Adam Lanza killed his mother Nancy then went into Sandy Hook Elementary school carrying a Bushmaster  rifle and two other handguns, where he opened fire killing 26 people, 20 of them children between the ages of five and ten years old. Shortly after the incident, Lanza shot himself, committing suicide.