Prime Minister Binyamin Netanyahu on Sunday opened the weekly cabinet meeting by expressing shock on behalf of the sate of Israel over the mass shooting at an elementary school in Newtown, Connecticut. "I send condolences to [US] President [Barack] Obama, to the bereaved families and to the American people."
"Who like us in Israel is familiar with massacres of children and innocents? I pray that the families and the American people find the strength to overcome this terrible tragedy," Netanyahu said.
On Saturday, the prime minister sent a letter to Obama expressing "profound grief" over the massacre. "I was shocked and horrified by [the] savage massacre of innocent children and adults at the Sandy Hook Elementary School in Connecticut," Netanyahu wrote, conveying his "deepest condolences" to the American people.
Obama was set to arrive in Connecticut on Sunday to join in the mourning for 20 children, all 6 and 7 years old, who were slaughtered by a gunman who forced his way into their school and shot them with a rifle at close range.
Obama's appearance at an interfaith vigil in the once-tranquil town of Newtown will be watched closely for clues as to what he meant when he called for "meaningful action" to prevent such tragedies in the wake of the massacre on Friday.
But politics will take a back seat to grieving, as more details emerge about the 12 girls, eight boys and six adult women that gunman Adam Lanza killed at the Sandy Hook Elementary School before killing himself.
Rabbi Shaul Praver of Temple Adath Israel in Newtown told NPR Weekend Edition host Scott Simon that he spent Friday -- which he termed "the day from Hell" -- consoling Pozner's mother, who is a member of the synagogue.
"I told the mother that was grieving that I personally believe in the eternity of the soul, and I believe that she will see her son again," Praver said. "Other than that theological comment, the rest of it was getting her to think about taking a breath and not trying to plan the rest of her life out right now, because she says, 'What am I going to do without my baby?'"
Praver was among the clergy, social workers and psychologists who arrived at a firehouse near the school where many of the victims and their families congregated after the shooting. On Saturday morning, Adath Israel held a community prayer service.
In response to the question of why such tragedies happen, Praver replied: "I don't know the answer to that. I never try to present a theological answer to that. I think what's more important is to have compassion, humanity and hold someone's hand and hug them and cry with them."
Praver, who ended his NPR interview with a plea for listeners to pray for the families affected, also said that another friend of the congregation was killed.
Olivia Engel had a part in a nativity play at St. Rose of Lima Catholic Church. "She was supposed to be an angel in the play. Now she's an angel up in heaven," Monsignor Robert Weiss told a standing-room-only crowd at the church before the play on Saturday.
Emilie Parker, another of the child victims, was studying Portuguese with her father. A Facebook memorial page for her already had nearly 147,000 "likes" as of Saturday night.
Vicki Leigh Soto, 27, saved her first-grade students' lives by putting herself between the kids and the gunman. Britain's Independent on Sunday newspaper splashed her photo on its front page with the caption "The Heroine of Sandy Hook."
School district officials said classes would resume Tuesday, except for Sandy Hook - as of Saturday night, they were still working on a plan for how and where to let the school's kindergarten-through-4th-grade classes resume.
Still looking for answers
Obama plans to travel to the affluent town of 27,000 people about 80 miles (129 km) from New York City to meet with victims' families and speak at the vigil at 7 p.m. local time (0000 GMT on Monday).
Though Americans have seen many mass shootings in the past decades, the victims have rarely been so young. On Saturday, some Democratic lawmakers called for sweeping new gun-control measures, a move certain to run up against stiff opposition from the nation's powerful pro-gun lobby.
While the president and families mourn, police are still pushing for a fuller explanation of what drove Lanza, 20, to apparently kill his mother at her house, go to Sandy Hook Elementary, shoot out a window and storm through the school with multiple weapons.
Police earlier said they had assembled "some very good evidence" on the killer's motives.
He had struggled at times to fit into the community and his mother Nancy pulled him out of school for several years, to home-school him, said Louise Tambascio, the owner of My Place Restaurant, where his mother was a long-time patron.
Nancy Lanza legally owned a Sig Sauer and a Glock, both handguns commonly used by police, and a military-style Bushmaster .223 M4 carbine, according to law enforcement officials, who also said they believed Adam Lanza used at least some of those weapons.
His father issued a statement saying the family was in a "state of disbelief."
The death toll exceeded that of one of the most notorious US school shootings, the 1999 rampage at Columbine High School in Littleton, Colorado, where two teenagers killed 13 students and staff before fatally shooting themselves.
At Virginia Tech, a Blacksburg, Virginia university where in 2007 a gunman killed 32 people in the deadliest school shooting in US history, an announcer extended sympathies to the residents of Newtown before a basketball game on Saturday.
Reuters and JTA contributed to this report