[Blitzer:] Connecticut state police confirm today, just a little while ago indeed, that Adam Lanza fired what they call hundreds of bullet, hundreds, at the Sandy Hook Elementary school on Friday and you a number of weapons with him. We are live from the Lanza home, in just a moment with that investigation, standby for that. Also, we are awaiting the arrival of President Obama. He is due here in Newtown shortly. He is going to speak with the families of the 26 people, most of them elementary school children who were shot dead Friday morning. Stay with CNN for that. You will see the president live right here when he arrives. And of course, that interfaith vigil, the entirety, all of it we will bring it to you live. Let's go out to the home where Adam Lanza lived with his mother that home is also right now a crime scene because it appears in Lanza's mother was killed killed in the home before the shooting rampage over at the elementary school. CNN's Alison Kosik is joining us now from the Lanza home. Alison, the state police, Connecticut state police, they just gave us an update. For those of the viewers weren't watching CNN live, tell us the main points that the police made.
[Alison Kosik, Cnn Correspondent:] The state police say that Adam Lanza shot and killed his mother, shooting her multiple times inside the house that is in this neighborhood where I'm standing right now. Police still have the street leading up to his house blocked off. You know, there hasn't been much activity since yesterday afternoon, up until about I would say a little over an hour ago, we watched about six police cars drive up several officials got out of their car, talked a built and then got back in the cars and drove off, we assume to Adam Lanza's house. Now, what we did learn throughout the day from state police is that their focus is really was on this school. And what they found was that four weapons were found at the school, three were found in the classroom a shotgun was found in Lanza's car that was parked outside the school. We also learned that Lanza mostly used a semiautomatic weapon called a Bushmaster inside the school to kill those 26 people inside the school. He had, as you said, he shot dozens of bullets and he had hundreds of unused ammunition as well, hundreds of bullets that were not even used. So, it was clear why the medical examiner came out yesterday and explained how Adam Lanza shot those 26 people multiple times, some of them, he shot, said the medical examiner, three to 11 times. It's clear that Lanza carrying that much ammunition on him was looking to cause the most destruction and death Wolf.
[Blitzer:] What a horrific, horrific crime. Alison, thank you so much. So, what happened Friday will make Monday, certainly, a huge challenge for so many families. Let's bring in our chief medical correspondent, Dr. Sanjay Gupta who is here with us now. Posttraumatic stress disorder that is going to be a huge problem.
[Dr. Sanjay Gupta, Cnn Chief Medical Correspondent:] It is. And you know, we are used to talking about this in the context over adults but it can happen in children and it can happen quickly. I think that's two things people don't always realize. And you know, how the children behave now, how a lot of these things are implemented that you've been talking about with people over the last couple of days, is going to make a big difference, if certain conversations had had. If special care is taken to make sure that children are sleeping well, for example. They are going to be able to cope much better in the long runs. So, you can predict, you know, certain likelihood of success in terms of that coping by what's happening the next few days.
[Blitzer:] We think of posttraumatic stress disorder, troops coming home from Afghanistan or Iraq. This is obviously very different than that. But, what are the symptoms? What should we be looking forward to? This is a very serious illness.
[Gupta:] In adults, you know, you think about things like hyper vigilance, difficulty sleeping, very quick and almost hasty reaction. In children, it can be very different. Sometimes don't verbalize it hard late all, changes in how they play. They may, in fact, start playing, you know, toy guns or something like that if they didn't before. They can have regression. So, a 6-year-old can start acting like a younger child, for example. And again, just paying attention to those things and not sort of glossing over, obviously don't want to provide graphic details, make sure you are having conversations. Tomorrow, kids go back to school. They don't know about what happened yet, they probably will by tomorrow.
[Blitzer:] I'm sure they will. And if their parents didn't tell them, teachers might tell them or their classmates would tell them.
[Gupta:] Social media.
[Blitzer:] Yes. They will hear about. And Sanjay is going to be with us throughout the night. We are awaiting the president of the United States. He is coming here to Newtown to bring some comfort to the families, the first responders. Also, he will participate in the interfaith vigil that will be taking place here in Connecticut. Our coverage continues right after this.