Update at 3:45 p.m. ET. 20 Children, Six Adults Killed:
Eighteen children were pronounced dead at the school and two more died after being taken to a hospital, Connecticut State Police Lt. J. Paul Vance just told reporters. Six adult victims, he said were dead at the scene.
The gunman, who he did not identify, was also found dead at the school.
Vance also confirmed that another adult who is connected to this tragedy in some way was found dead today.
Update at 3:20 p.m. ET. "Our Hearts Are Broken Today," President Says:
A visibly upset President Obama, pausing at times to wipe his eyes, just told the nation that "our hearts are broken today."
"The majority of those who died today were children - beautiful little kids between the ages of 5 and 10 years old," he said. "They had their entire lives ahead of them ... birthdays, graduations, weddings, kids of their own."
Obama said he and the first lady, like all parents, will hug their children hard tonight. He asked the nation to pray for those who were killed and their families. Quoting Scripture, he said he hopes that will help "heal the broken-hearted and bind up their wounds."
Flags at the Capitol have been lowered to half staff.
Update at 3:05 p.m. ET. Home In New Jersey Being Searched:
"Police cars and multiple press agencies are presently swarming a location at 13th and Grand streets in Hoboken," the Hudson Reporter writes. It's been reported, as the newspaper adds, that the father of the suspect in the Connecticut rampage may have been killed in Hoboken earlier today.
Update at 3 p.m. ET. President Obama To Speak:
The White House says the president will address the nation at 3:15 p.m. ET.
Update at 2:45 p.m. ET. Law Enforcement Source: Gunman's Name Is Ryan Lanza.
A law enforcement source in position to know tells NPR's Carrie Johnson that the gunman's name was Ryan Lanza who's said to be in his early or mid-20s. That's what other news outlets were told earlier. The source also says one of the weapons found at the scene was a .223-caliber rifle.
Update at 2:30 p.m. ET. From The New York Times: Gunman's Mother Was A Teacher At The School.
"Law enforcement official says gunman at Ct. school killed mother, who was teacher, then killed 18 children in class," tweets Times Deputy Metro Editor Clifford Levy. NBC News is reporting that a body found in New Jersey is that of the suspect's father. Neither of those reports has been independently confirmed by NPR.
We are beginning to see reports, citing unnamed sources, about who the gunman was. NPR, however, has not yet heard from anyone in authority who the shooter was.
Update at 2:25 p.m. ET. "We Were Told To Hold Each Others' Hands And Close Our Eyes," Child Says About Evacuation.
A heartbreaking account from one of the young students. As they were being led from the building, the children were told to old each others' hands and "close our eyes."
Update at 1:45 p.m. ET. "Several Fatalities":
"There were several fatalities at the scene, both students and staff," Connecticut State Police Lt. J. Paul Vance just told reporters. He said he would not give specifics, pending notification of the victims' families.
According to Vance, 911 calls started coming into Newtown police around 9:30 a.m. The local police contacted state authorities, who responded to the scene. Officers "immediately entered the school," Vance said, and started both searching for the shooter and evacuating the students and staff.
The gunman, Vance said, was found "deceased inside the building."
Our original post and earlier updates follow:
11:20 a.m. ET: There was a shooting at an elementary school in Newtown, Conn., this morning, but as is often the case in the early minutes and hours after such a tragedy it is not clear what has happened.
We will update when more solid information comes in about the situation at Sandy Hook Elementary School.
Among the local news outlets that are following the story closely:
-- NBC Connecticut.
-- The Newtown Bee.
WSHU reporter Craig Lemoult has also just arrived at the scene.
Update at 12:37 p.m. ET. Hospital Confirms Three Patients; News Conference Set For 1 p.m. ET Again:
John Murphy, a spokesman at Danbury Hospital, just told reporters that there are three patients at the hospital with injuries suffered during the incident. He also said it's his understanding that police will be briefing at 1 p.m. ET.
Update at 12:15 p.m. ET. News Briefing Moved Up:
Authorities are now expected to brief the news media shortly.
Update at 11:35 a.m. ET. News Briefing Later:
Connecticut State Police are expected to hold a news briefing at 1 p.m. ET.