There's been a mass shooting at Sandy Hook Elementary School in Newtown, Connecticut
We're told there are 18-20 children who have been killed, with a death toll close to 30
Law enforcement tells CNN suspect is named Ryan Lanza
Below are the latest updates as they come to us or you can read our story of theConnecticut school shooting
[Updated at 3:22 p.m. ET] It appears that another member of the alleged shooter's family is dead. A senior law enforcement official familiar with the investigation says a brother of the alleged shooter was found dead in a home searched in Hoboken, New Jersey. We already knew Ryan Lanza's mother was found dead in the elementary school.
[Updated at 3:16 p.m. ET] From the president: "I offer Gov. Malloy my condolences on behalf of the nation."
The president appears to be emotional, he's wiping his eye.
Here's more of what he's saying:
"We've endured too many of these tragedies in the past few years. Each time I learn the news I react not as a president but as anybody else would as a parent.
"That was especially true today.
"I know there's not a parent in America that doesn't feel the same overwhelming grief that I do.
"The majority of those who died today were children, beautiful little kids between the ages of 5 and 10.
"They had their entire lives ahead of them, birthdays, graduations, weddings, kids of their own."
"Our hearts are broken today for the parents and grandparents, sisters and brothers of these children and the families of the adults we lost.
"As a country, we have been through this too many times.
"This evening Michelle and I will do whah every parent in America will do - hug our children a little tighter and tell them that we love them.
"There are families in Connecticut that cannot do that tonight and they need all of us tonight.
"May god bless the memory of the victims and in the words of scripture heal the broken hearted and bind up their wounds."
[Updated at 3:14 p.m. ET] The president will talk soon. You can watch him onour live stream here.
[Updated at 3:12 p.m. ET] President Obama has ordered flags to be lowered to half-staff as a mark of respect for the victims “of the senseless acts of violence perpetrated on December 14, 2012, in Newtown, Connecticut,” according to a release from the White House.
[Updated at 3:09 p.m. ET] The suspect's mother was shot and killed at the school, according to source close to the investigation. She was a teacher there.
And we now know that Ryan Lanza, the suspected gunman, was 24.
[Updated at 3:01 p.m. ET] The principal and guidance counselor at Sandy Hook Elementary School were both killed during the shooting, according to a witness that spoke to CNN.
[Updated at 2:52 p.m. ET] We have just learned via a tweet from House Speaker John Boehner that flags at the U.S. Capitol will be lowered.
[Updated at 2:47 p.m. ET] President Obama will make a statement on the tragedy at 3:15 p.m. ET. We'll have that live on CNN TV and right here.
[Updated at 2:45 p.m. ET] Various locations are being used as staging areas around Newtown. This is outside the Newtown Methodist Church near the school where a woman is hugging a child.
[Updated at 2:39 p.m. ET] Federal law enforcement officials have told CNN's John King that the shooting happened quickly and happened in a concentrated area.
[Updated at 2:32 p.m. ET] Connecticut Gov. Malloy will be in Newtown and talk about the tragedy today at 3:30 p.m. ET.
[Updated at 2:20 p.m. ET] We are now hearing from CNN's Mary Snow, who is reporting from outside the suspect's home, that dozens of law enforcement officials are on the scene.
Neighbors are "shaken," Snow said.
[Updated at 2:11 p.m. ET] CNN's Susan Candiotti has just reported that a law enforcement official tells her the suspect is named Ryan Lanza and he is in his 20s.
[Updated at 2:09 p.m. ET] We're hearing even more devastating news out of Newtown, Connecticut. CNN's Susan Candiotti has been told that 18 to 20 of the dead are children.
[Updated at 2:07 p.m. ET] CNN's Jessica Yellin is reporting that we're likely to hear from President Obama today on the school shooting, according to a senior administration official. We don't know when our where we may hear from President Obama.
[Updated at 2:04 p.m. ET] Lisa Procaccini, the parent of an 8-year-old at the school, tells CNN that her daughter said school officials kept her calm during the shooting and told her the loud noise was hammering going on.
Eventually police came in and let her daughter and her teacher leave the school building.
"I'm even kind of numb about what's going on," she told CNN's Wolf Blitzer. "I'm in a state of shock. I don't know how Im going to handle having [my daughter] know ... about the whole situation."
[Updated at 1:57 p.m. ET] The death toll is closer to 30 than 20, a federal law enforcement source in Washington told CNN's John King. Most of those killed are children, the source said.
The source also said the suspected gunman, who is dead, had a connection to the school. He would not elaborate on that connection. The source is in touch with authorities on the scene.
[Updated at 1:53 p.m. ET] Congresswoman-elect Elizabeth Esty, who was recently won a seat representing a district that includes Newtown, Connecticut, just released the following statement on the tragedy:
As a mother, I can only begin to imagine what the students, parents, teachers and staff of Sandy Hook Elementary must be experiencing. My thoughts and prayers go out to everyone impacted by this horrific tragedy. While details are still emerging, I hope for the safety and well being of the children, teachers and staff at Sandy Hook Elementary and for the Newtown community.
[Updated at 1:51 p.m. ET] We have just learned that the suspected shooter is 20-years-old, a law enforcement source with knowledge of the investigation tells CNN’s Susan Candiotti.
[Updated at 1:47 p.m. ET] A few more details from the White House press briefing earlier. White House spokesman Jay Carney said while today is not the day to debate gun policy, an assault weapons ban "does remain a commitment" of President Obama.
[Updated at 1:45 p.m. ET] We are now learning that a male is being questioned by investigators, but he is not being called a suspect, CNN's Susan Candiotti reports.
[Updated at 1:42 p.m. ET] Connecticut State Police Lt. Paul Vance said the shooter is dead inside the school.
Vance said there are a number of fatalities that includes both children and adults. He did not add more details about how many people were killed during the school shooting.
[Updated at 1:41 p.m. ET] Police have now begun their briefing on the shooting.
[Updated at 1:32 p.m. ET] We're hearing more from the scene of the massacre through tweets and interviews.
[Updated at 1:23 p.m. ET] President Obama has spoken to FBI Director Robert Mueller and Connecticut Gov. Dan Malloy to get the latest information and express his condolences, White House spokesman Jay Carney said.
[Updated at 1:21 p.m. ET] We're now hearing that it may be a while for the briefing from the police.
[Updated at 1:17 p.m. ET] This was the scene from the air earlier, taken by News 12 Connecticut, with emergency vehicles in the school parking lot.
[Updated at 1:09 p.m. ET] The police are set to give a news conference soon where we'll learn more. We'll bring that to you as soon as it starts.
[Updated at 1:07 p.m. ET] Here's the chilling account told to CNN's Meredith Artley of what happened at the school.
[Updated at 12:59 p.m. ET] Many people are talking again about gun control. But White House spokesman Jay Carney isn't joining in for now.
"I think it's important on a day like today to view this as I know the president, as a father does and I as a father and others who are parents certainly do, which is to feel enormous sympathy for families that are affected and to do everything we can to support state and local law enforcement and support those who are enduring what appears to be a very tragic event. There is, I'm sure, will be, rather, a day for discussion of the usual Washington policy debates but I don't think today is that day.
[Updated at 12:57 p.m. ET] From the News Times reporter at the school:
[Updated at 12:48 p.m. ET] "Close to 20” people have been killed, including at least 10 children, a law enforcement source with knowledge of the investigation says.
[Updated at 12:47 p.m. ET] President Barack Obama has been informed of the school shooting in Connecticut and will receive regular updates throughout the day, the White House said on Friday.
[Updated at 12:27 p.m. ET] The mom who spoke to CNN's Meredith Artley said she heard "at least 100 rounds" being fired.
The shooting began about 9:35 a.m., the parent said. There was a "pop pop pop" in the hall outside the room. Three people went out of the room into the hall where the sounds had come from. "Only one person came back," we were told.
The witness told Artley that she then called 911. She said she never saw the shooter but she later was escorted outside the room past two bodies lying in blood.
[Updated at 12:20 p.m. ET] A third-grader describes the shooting to WTNH:
[Updated at 12:16 p.m. ET] Two adults were killed, according to a parent who was at the school during the incident, and who talked to our colleague Meredith Artley.
[Updated at 12:12 p.m. ET] We just got this from U.S. Senator-elect Chris Murphy:
"I am shocked and saddened by the horrific news from Sandy Hook Elementary School this morning, and I pray that kids, teachers, staff, and families reach safety as quickly as possible. While we don't have much information right now, our thoughts are with the victims and their loved ones."
[Updated at 12:05 p.m. ET] The shooter's body is in a classroom, a source with knowledge of the investigation tells CNN’s Susan Candiotti.
[Updated at 12:02 p.m. ET] Multiple local media are reporting there are fatalities. We're checking.
[Updated at noon ET] News Times reporter Libor Jany reports that all Newtown schools are on lockdown.
[Updated at 11:58 a.m. ET] Danbury Hospital confirms it's treating some victims. It says this on its Facebook page:
To date, three patients have been transported to Danbury Hospital from the scene. Out of abundance of caution and not because of any direct threat Danbury Hospital is under lockdown. This allows us simply to focus on the important work at hand.
[Updated at 11:54 a.m. ET] Connecticut House Rep. John Frey has nieces and a nephew at the school and is tweeting updates.
[Updated at 11:47 a.m. ET] The dad of a student at the school told CNN affiliate WTNH there were about 600 pupils in the building at the time of the shooting.
[Updated at 11:45 a.m. ET] At least three people were wounded and are in "very serious" condition at a hospital in Danbury, Connecticut, that town's mayor, Mark Boughton told CNN. He couldn't say whether the victims were children.
[Updated at 11:44 a.m. ET] Andrew Doba, Director of Communications with Connecticut Governor Malloy's office, says they are coordinating with local authorities and state police. They continue to monitor developments in Newtown. The governor is in Connecticut today.
[Updated at 11:40 a.m. ET] We're getting live pictures from the scene from CNN affiliates.
[Updated at 11:34 a.m. ET] The shooter is dead, a source with knowledge of the investigation, tells CNN’s Susan Candiotti.
Police have recovered two weapons from him, the source added.
It's not known whether police killed the alleged shooter or he took his own life. The source says one weapon recovered is a Glock and the other is a Sig Sauer.
[Updated at 11:27 a.m. ET] The Hartford Courant, citing police, said an unspecified number of people had been shot. The nature of their injuries was unclear, the newspaper said. But it cited police in saying one person had "numerous gunshot wounds."
[Updated at 11:19 a.m. ET] Affiliate WTNH says children are being taken to a nearby firehouse.
[Updated at 11:10 a.m. ET] Details are still really sketchy, but we now have a photo from the Newtown Bee of children being led from the scene.
[Updated at 11:03 a.m. ET] We're still getting details in of how many people may have been hurt.
Newtown is southwest of Hartford:
[Updated at 10:53 a.m. ET] Sandy Hook school is on lockdown and students are not being evacuated, a Newtown police spokesman tells us.
[Posted at 10:30 a.m. ET] Breaking news coming in - Connecticut State Police are responding to reports of a shooting at a Newtown elementary school in southwestern Connecticut, according to police spokesman Lt. Paul Vance.
We'll bring you more details as soon as we get them.
Our affiliates in the area are saying the school is the Sandy Hook Elementary School.
CT Now says injuries are being reported.