This day in history: Dec. 14, 2012

Gunman opens fire at Sandy Hook Elementary School.
3:32 | 12/10/18

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Transcript for This day in history: Dec. 14, 2012
Right here in Newtown Connecticut the site today of that shooting and this time. Gunfire aimed at elementary school children. We're here in front of the new time United Methodist Church we've watched people gathering all evening long as tonight the details are still pouring in. There are 27 victims twenty children seven adults. And we've heard all day about the U credible response by teachers inside the school which is considered one of the leading schools and the nation. And also tonight we have a new image of the suspected shooter. As we tell you everything we know about who did it what kind of weapons and why. And would begin all of this with 20/20 anchor Chris coal mine he's here right now with me. Paris Diana's and almost an unimaginable see what we know so far as an inside this elementary school was a group of young kids. They were protected by their teachers and there was one deranged man who decided to take it all away. This morning the sandy hook elementary school was full of kids concerned about Christmas. And then at 9:40 AM shots rang out. I. And all your ear police got. At. Term act Glassman horrible things are happening teachers make sure they're safe and then to the unimaginable what as a teacher. He advanced sound suddenly current bad things in the Palin on gains from the. Did you learn more bad noises. Her own. Lar. The teachers com matched by a storm a police activity word of two shooters spark searches of the surrounding area. Children are rushed out of the school's single file hand in hand eyes squeezed shut. We got in there crying and current gang. Did you find your way out with your eyes closed firmly. But I hands and had a people's dads and and I TJ ho a different person seen in jail and a asked out. The chaos. Complete chaos nobody knew or anyone wants is a mob scene of children and police didn't. Adults and Ellis mom AB and dozens of other family search for their kids as the formation starts to trickle in. I heard that children are taken out bloody. I'm very scared worried about my got a leg up the other kids but I know here. It was terrifying incident so I'm still terrified of it absorbs shock about it I still don't know everything that happens. A situation that couldn't be any more terrifying kids at the mercy of a deranged gunman and yet it keeps getting worse. Here. Among the dead twenty year old gunman Adam Lanza and his mother who's a teacher's aide at the elementary school. He came with a bulletproof vest and four guns including two semiautomatic handguns and possibly an assault rifles say authorities. He killed so many of the kids she law. It's a very very difficult scene for the family members for all the responding first responders Richard's tragic it's a tragic scene. And yet many more survived like little Ella who will still have a chance at a Merry Christmas it's over. They're. You know then and there.

This transcript has been automatically generated and may not be 100% accurate.

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