[Updated at 4:13 p.m. ET] The victims ranged in age from 6 to 56, according to information released by state police.
Eighteen of the victims were described as female; eight were male. Twenty-six people died at the school, excluding the gunman. Twenty were children; six were adults
[Updated at 4:11 p.m. ET] More on what the state's chief medical examiner told reporters minutes ago in Newtown: He said the "rifle" was used in the shooting, and that the rifle caused all of the wounds that he knew of.
He didn't say what that rifle was, but a law enforcement source has previously said that the gunman was found dead with next to three guns: a semi-automatic .223-caliber Bushmaster rifle and two pistols made by Glock and Sig Sauer.
The medical examiner, H. Wayne Carver II, said he personally did postmortem examinations of seven victims' bodies.
“All the wounds that I know of at this point were caused by the one weapon,” Carver said.
[Updated at 3:58 p.m. ET] State police have released a list of those killed. More on that to come.
[Updated at 3:55 p.m. ET] The state's chief medical examiner says he believes all of the victims were shot more than once.
The medical examiner, H. Wayne Carver II, speaking at a news conference in Newtown, said that all of the victims died of gunshot wounds, and the manner of death was homicide. The seven bodies he examined personally had three to 11 wounds each, he said.
“I believe everyone was hit more than once,” Carver said.
Postmortem examinations have been performed on all of the children; examinations of most of the adult bodies will be finished by this evening, Carver said.
Examinations of the bodies of Adam Lanza and his mother will be performed Sunday, Carver said. Lanza died at the school; his mother was killed at her home in Newtown, authorities have said.
Police said a list of the victims' names would soon be published.
[Updated at 3:26 p.m. ET] Victoria Soto and Lauren Rousseau, both teachers at the school, are among the dead, according to friends and family members.
Earlier, CNN reported that princial Dawn Hochsprung and school psychologist Mary Sherlach were among the killed.
Although authorities have identified all of those killed, they have yet to release a formal list of names.
[Updated at 3:06 p.m. ET] Investigators say they believe Adam Lanza tried to buy a gun at Dick's Sporting Goods in Danbury on Tuesday, but was unsuccessful, a law enforcement source with knowledge of the investigation told CNN's Susan Candiotti.
Employees at the store – some 12 miles from Sandy Hook Elementary – have been interviewed and have searched the store's surveillance cameras for evidence that Lanza had been there.
Also, a second law enforcement source has said that Lanza was involved in some kind of trouble at the school earlier this week. The source said the altercation was between Lanza and four adults, and occurred Thursday, the day before the shooting.
Three of those adults, the source added, were killed during Friday's shooting.
The source was unable to say whether the disagreement took place inside or outside the school, but said that it apparently had something to do with him trying to enter the school.
Earlier, a law enforcement official told CNN's Carol Cratty that Lanza had some sort of altercation with people at the school a few days before the shooting (see 1:12 p.m. entry).
[Updated at 1:36 p.m. ET] Connecticut Gov. Dannel Malloy is expected to make a live, televised statement about the shooting, addressed to Connecticut residents, at 5 p.m.
[Updated at 1:12 p.m. ET] Investigators have been told that Adam Lanza had some sort of altercation with some people at the school a few days before the shooting, a law enforcement official told CNN's Carol Cratty. The official did not know the nature of the altercation or who was involved in it with Lanza.
[Updated at 11:59 a.m. ET] Adam Lanza tried to buy a gun in the area Tuesday before the shooting, a law enforcement source said, according to CNN's Susan Candiotti.
The Bureau of Alcohol Tobacco, Firearms and Explosives said it is contacting shooting ranges and gun stores in the area to try to establish whether Lanza sought to purchase guns or practice using them.
[Updated at 11:50 a.m. ET] The gunman had access to more guns than the three found at the elementary school, a law enforcement source told CNN's Susan Candiotti.
Police recovered three additional guns elsewhere. They are a .45-caliber Henry repeating rifle, a .22-caliber Marlin rifle, and a .30-caliber Enfield rifle, the source said.
[Updated at 10:28 a.m. ET] The victims have been positively identified by the chief state medical examiner, state police spokesman Lt. J. Paul Vance said in a press conference Saturday morning. The medical examiner is expected to release their names and birth dates in the next few hours.
It appears that the assailant "forced his way into the school," Vance said. Detectives continue to investigate the crime scene and will remain there for at least another day or two, Vance said. So far, investigators looking for a motive have found "some very good evidence," that will help them paint a complete picture of how and why this happened, he said.