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NEWTOWN, Conn. -- Newtown returned its students to their classrooms Tuesday for the first time since last week's elementary school massacre and laid to rest two more slain 6-year-olds, the latest in a long, almost unbearable procession of grief.

The resumption of classes at all of Newtown's schools except Sandy Hook Elementary School brought a return of familiar routines, something students seemed to welcome as they arrived aboard buses festooned with large green-and-white ribbons -- the colors of the school where 26 people were gunned down Friday.

"We're going to be able to comfort each other and try and help each other get through this, because that's the only way we're going to do it," said P.J. Hickey, 17, a senior at Newtown High School. "Nobody can do this alone."

There was little new word from investigators seeking a motive for the massacre. Gunman Adam Lanza, 20, killed his mother, Nancy Lanza, in her home before slaughtering 20 children and six women working at the school, and then committed suicide.

A new, unofficial theory emerged -- that he may have snapped because his mother was planning to commit him to a psychiatric facility. The report by Foxnews.com cited an interview with Joshua Flashman, 25, a U.S. Marine and area resident who said he was familiar with the killer's family.

"From what I've been told, Adam was aware of her petitioning the court for conservatorship and [her] plans to have him committed," Flashman said. "Adam was apparently very upset about this." Nancy Lanza had worked as a volunteer at the school, and "Adam Lanza believed she cared more for the children than she did for him."

A senior law enforcement official confirmed that whether Lanza was angry over plans for "his future mental health treatment" was being looked at, according to the report.

At St. Rose of Lima Catholic Church in Newtown, funerals were held for first-graders James Mattioli and Jessica Rekos, the first of eight to be held in coming days at the church.

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James was remembered as a boy who especially loved recess and math, and who couldn't wait until he was old enough to order a foot-long Subway sandwich.

"It was very somber, it was very sad, it was very moving," said Clare Savarese, who taught the boy in preschool and recalled him as "a lovely little boy. A sweet little angel."

The service had not yet concluded when mourners began arriving for the funeral of Jessica, who loved horses and was counting the years until she turned 10, when her family had promised her a horse of her own. For Christmas, she had asked Santa for new cowgirl boots and hat.

"We are devastated, and our hearts are with the other families who are grieving as we are," her parents, Rich and Krista Rekos, said in a statement.