Connecticut school shooter Adam Lanza used a semi-automatic rifle to shoot Sandy Hook students and staff at close-range and may have also used three others guns, which were found at the scene and nearby during the massacre, sources told ABC News.
At least some of the weapons used, including the handguns, appear to match firearms registered to the family, although the urgent federal gun record checks are not completed.
Authorities indicated today that they have "some very good evidence" about the motive behind Lanza's shooting spree at the school in Newtown, Conn.
Also key will be the lone person shot by Lanza who wasn't killed. The female teacher has not been publicly identified.
"She is doing fine," Vance said at a news conference today. "She has been treated and she'll be instrumental in this investigation."
Investigators tell ABC News that right now it appears that reports of an altercation involving Lanza at the school in the days before the mass slaying are not checking out.
The grim task of identifying all of Lanza's 27 victims, which included 20 children, was completed today. Families, who already feared the worst, were informed that their loved ones were dead early today.
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All of the bodies have now been removed from the school and medical examiners are expected to provide a full list of victims later today.
With the tally of Lanza's carnage complete, authorities and the grieving people of Newtown, Conn., are left to wonder why he turned the elementary school in this quaint New England town into a slaughter house.
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Connecticut State Police Lt. Paul Vance, who had compared the investigation to "peeling back the layers of an onion," said the investigation "did produce some very good evidence" about motive, but he would not go into further detail.
He indicated the evidence came from the shooting scene at the school as well as at the home where Lanza's mother, Nancy, was slain.
Vance said that Lanza forced his way into the school, but did not say how.
Evidence emerged today that Lanza's rampage began in the office of school principal Dawn Hochsprung while the school intercom was on. It's not clear whether it was turned on to alert the school or whether it was on for morning announcements, but the principal's screams and the cries of children heard throughout the school gave teachers time to take precautions to protect their children.
Hochsprung was among those killed in the Friday morning killing spree.
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Authorities have fanned out to New Jersey, Connecticut and Massachusetts to interview Lanza's relatives, ABC News has learned.
According to sources, Lanza shot his mother in the face, then left his house armed with at least two semi-automatic handguns, a Glock and a Sig Sauer, and a semi-automatic rifle. He was also wearing a bulletproof vest.
Conn. Shooting: Cops Probe Report of Earlier Altercation
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Conn. Shooting: Cops Probe Report of Earlier Altercation
