The city of Bend, Ore., is praising those who worked to stop the gunman at Silver Rail Elementary School. The authorities are searching for answers.

© Jordan Gale for The New York Times

One data scientist who tracks gun violence in schools says he is encouraged that people have become more vigilant about spotting warning signs.

© Jordan Gale for The New York Times

The boy who attacked a school in Bend is said to have used his mother’s gun. Some states have passed measures to address similar situations.

One teacher and three children killed after Griffin J John II, 16, barged into elementary school and began shooting

• Oregon elementary school shooting: what we know so far

The 16-year-old who barged into an elementary school in Bend, Oregon, and unleashed a barrage of gunfire that killed a teacher and three children was a former student at Silver Rail elementary, officials confirmed in a Friday press conference.

The heavily armed shooter, identified as Griffin J John II, climbed over a fence and onto the school’s property before shooting through a set of locked doors to enter the building.

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© Photograph: Haven Daley/AP

© Photograph: Haven Daley/AP

© Photograph: Haven Daley/AP

Residents of Bend attended a candlelight vigil after the shooting at Silver Rail Elementary School, in which three children and a teacher were killed.

© Mathieu Lewis-Rolland/Getty Images

A 16-year-old opened fire inside a special education classroom at the Silver Rail Elementary School, killing three children and one teacher, before he was fatally shot by an armed bystander.

© Rob Kerr/Reuters