Bend school shooting: driver, dad and teacher tried to stop the gunman

How bystanders intervened: Bend Police Chief Mike Krantz said Friday that at about 12:58 p.m. the gunman threw a shotgun over a fence, climbed onto campus and was verbally confronted by the driver of a red Toyota pickup. The teen fired at the truck, hitting it at least three times; the driver was not hurt and made the first 911 call at 12:59 p.m. Kaylub Giamanco, 36, a carpenter and father of two Silver Rail students, then followed the gunman into the building with a .40-caliber pistol he kept legally in his vehicle, his brother and police said. Inside a special-education classroom, a teacher threw her cellphone at the gunman, tackled him and fought for the firearm. Giamanco entered, saw that fight and shot the suspect multiple times; officers found him dead, Krantz said. "She was not injured in that incident, but she almost certainly helped prevent more bloodshed," Krantz said of the teacher.

Victims and condition updates: A family spokesperson identified the 5-year-old killed as Rhoam Summer. Lambert's family said teaching at Silver Rail "was her dream job" and that she "always fought for the underdog and those with special needs." Drury's husband said her injuries were serious but non-life-threatening. Police said Friday the wounded 7-year-old was in serious but stable condition after surgery. Families of the other two children killed asked that names not be released.

Gun and investigation: Officials told NBC News the pump-action shotgun was purchased by the suspect's mother around his August birthday; she has been cooperative, law enforcement sources said. Oregon generally bars people under 18 from buying rifles and shotguns; minors can possess some long guns with parental consent for limited reasons. ATF, FBI and state police are assisting. District schools were closed Friday.

What's still unknown: A full motive; how many rounds were fired (police have said as many as about 15 overall); whether criminal charges related to the gun transfer will follow; and when Silver Rail will reopen.

Updated Saturday morning with Friday's Bend police briefing as reported by NBC News, AP and the Washington Post. Suspect named by police as Griffin J. John II. Injured educational assistant identified by her husband as Rebecca Drury. One child killed identified by family as Rhoam Summer, age 5; other child victims' families asked that names not be released.