AR-15 with high-capacity magazines used by Adam Lanza in Sandy Hook School shooting

NEWTOWN, Conn. - Adam Lanza was equipped with an assault rifle and two handguns inside Sandy Hook School, Conn. State Police said. An additional weapon, a shotgun, was found in Lanza's vehicle outside the school.

Sunday was also the first official confirmation that Lanza was the shooter who killed six adults and twenty children inside the school.

According to Connecticut State Police Lt. Paul Vance, Lanza had multiple high-capacity magazines for the Bushmaster AR-15 rifle. Those high-capacity magazines held 30 rounds each, Vance said.

Lanza also had multiple magazines for the Glock 10mm and Sig Sauer 9mm handguns.

As a result, Vance said, Lanza was armed with "hundreds of bullets."

Saturday, Connecticut medical examiner Dr. H. Wayne Carver said the 7 victims he examined had each been shot between three and eleven times. He also said he believed each victim was shot multiple times.

If the three-to-eleven shot estimate is accurate for each victim, and Lanza used only 30-round magazines, he would have used between four and ten magazines.

State Police refused to comment on precisely how many magazines were emptied or shell casings were found, but said they had collected those items for examination.

Still, the shooting ended while Lanza still had enough unused ammunition to carry out significant additional carnage.

"There was a lot of ammo, a lot of clips," State Police Lt. Paul Vance. "Certainly a lot of lives were potentially saved."

Vance said Lanza used one of the handguns to take his own life, but wouldn't speculate on when or why Lanza decided to end his spree.

Early in the Sunday afternoon statement, Vance also confirmed that the shooter's mother, Nancy Lanza, was the victim found at an alternate location. She was shot four times in the head and found in her bed wearing pajamas, said a state official who was not authorized to disclose details of the investigation and spoke to the Associated Press on condition of anonymity.

Education officials said they had found no link between Lanza's mother and the school, contrary to news reports that said she was a teacher there. Investigators said they believe Adam Lanza attended Sandy Hook many years ago, but they had no explanation for why he went there Friday.

As President Barack Obama prepared a visit and churches opened their doors to comfort a grieving town Sunday, federal agents fanned out to dozens of gun stores and shooting ranges across Connecticut, chasing leads they hoped would cast light on Lanza's life.

Among the questions: Why did his mother, a well-to-do suburban divorcee , keep a cache of high-power weapons in the house? What experience did Lanza have with those guns? And, above all, what set him on a path to go classroom-by-classroom, massacring 6- and 7-year-olds?

At St. Rose of Lima Roman Catholic church in Newtown, Jennifer Waters, who at 6 is the same age as many of the victims and attends a different school, came to Mass on Sunday in Newtown with a lot of questions.

"The little children — are they with the angels?" she asked her mother while fiddling with a small plastic figurine on a pew near the back of the church. "Are they going to live with the angels?"

Her mother, Joan, 45, assured her they were, then put a finger to her daughter's lips, urging her to be quiet.

An overflow crowd of more than 800 people attended the 9 a.m. service at the church, where eight children will be buried later this week. The gunman, Adam Lanza, and his mother also attended church here. Spokesman Brian Wallace said the diocese has yet to be asked to provide funerals for either.

Boxes of tissues were placed strategically in each pew and on each window sill. The altar was adorned with bouquets, one shaped as a broken heart, with a zigzag of red carnations cutting through the white ones.

In his homily, the Rev. Jerald Doyle, the diocesan administrator, tried to answer the question of how parishioners could find joy in the holiday season with so much sorrow surrounding them.

"You won't remember what I say, and it will become unimportant," he said. "But you will really hear deep down that word that will finally and ultimately bring peace and joy. That is the word by which we live. That is the word by which we hope. That is the word by which we love."