A top aide resigned after allegations he abused his exwives. Congress is investigating why rob porter and dozens of white house staffers have yet to obtain permanent security clearances. Plus, dr. Tara narula shows us how your workplace could be a breeding ground for the flu. We begin this morning with a look at todays eye opener, your world in 90 seconds. I just saw blood everywhere. Everybody panicking, crying. I dont know. A nation mourns after another School Shooting. A gunman sending panicked students running for cover. He was arrested. The day you pray will never happen has happened. An unbelievably catastrophic day. Im sick to my stomach. How could this even happen in the country . To come to the conclusion this is absolutely pure evil. The shooting is once again bringing the gun control debate front and center. We are responsible for a level of mass atrocity that happens in this country with zero parallel. President trump has denounced Domestic Violence for the First Time Since a top aide was accused of abuse. I am totally opposed to Domestic Violence of any kind. Everyone knows that. A 4yearold girl who disappeared from her South Carolina home has been found safe and sound. Were so thankful. All that the 2yearold child fell on to subway tracks in italy. A teen jumped in and saved the child. Talk about being at the right place at the right time. And all that matters. Gold for Mikaela Shiffrin in p pyeongchang. Mikaela shiffrin used the final race to get the gold. On cbs this morning. We try to come past this incident. We have to move forward arm in arm. This has been a day weve seen the worst in humanity. Tomorrow is going to bring out best in humanity as we come together to move forward from this unspeakable tragedy. This mornings eye opener is presented by toyota. Lets go places. Welcome to cbs this morning. As you wake up in the west. We are await ago briefing from investigators in florida and an address from President Trump on that deadly high School Shooting. Both are expected within the next hour. Well bring them to you live. Yesterdays rampage have left parents in shock and a community in agony. Police say a former student killed 17 people and wounded more than a dozen others at the Marjorie StonemanDouglas High School in parkland. Weve learned the names of two of the victims this morning. Jamie guttenberg was a student at the high school. Her brother jesse reported lly attended the same school. He made it home safely. An assistant football coach and Security Guard was also killed in the shooting. He was shielding students from the gunman when he was shot. The suspect, 19yearold nikolas cruz, was charged with 1 cou with 17 counts of premeditated murder this morning. Officials say cruz brought an ar15 semiautomatic rifle and several rounds of ammunition to the school. He also wore a gas mask and carried smoke grenades. Cbs jeff glovr is at the school. Reporter this remains a busy numb scene today. This is a huge campus, more than 10 buildings, 10 classroom buildings behind us, more than 3,000 students. Investigators worked throughout the night here as weve watched, gathering evidence at stoneman doug has high, which remains a crime scene. All School Activities are canceled the rest of this week. Police say the gunman started his rampage outside the school, then went inside and fired more shots. Hundreds of students fled. Police say the shoot eer concead himself in the crowd and was seen running out of the school. Those who did not flee were trapped in their classrooms. Some of them saw classmates die right in front of them. Many of the horrific moments were captured on cell phone cameras. We do want to warn you, some of the footage youre about to see is graphic. [ gunfire ] the gunshots started ripping through the high school around 2 30 p. M. Wednesday. The heavy Police Response arrived minutes later. The subject is going to be a white male, possibly nikolas cruz. Reporter the suspected gunman was identified as nikolas cruz, a 19yearold who had been expelled from the school. He allegedly began the rampage outside, where two people died. Once inside, carrying a gas mask and smoke bombs, cruz apparently pulled a fire alarm, causing chaos, then began shooting. 12 people died inside the school. Broward county sheriff scott israel. He had countless magazines. Multiple magazines. And at this point, we believe he had one ar15 rifle. Theyre following him on video on the camera. They had him exiting the building running south. Reporter police were able to track his movements in part using the School Surveillance cameras. He was captured about an hour after he allegedly first opened fire. A s. W. A. T. Team then went room to room clearing the school. Put your phones away. Reporter frightened students ran down highways, stepping over discarded backpacks. He went up and down the highway, just shooting into the classrooms. He shot through my door and broke the window. Reporter the suspect posted photos of knives and guns on instagram. In a voice mail sent to parents in palm beach county, robert avossa, the superintendant there, asked parents and students if they see something to Say Something. If the accounts are correct, this individual was posting things on social media that should have been a red flag. Reporter Broward County superintentant robert rensi. Words cannot express the sorrow we feel. No parent should ever have to send their kids to school and have them not return. Beave g weve got to find a way for this to stop. Reporter the president plans to address the nation about the shooting around 8 00 a. M. Pacific time. We will bring that to you live. About an hour ago, the white house lowered its American Flag to halfstaff. In a proclamation just out, President Trump said, quote, our nation grieves with those who have lost loved ones. Manuel bojorquez is here. Reporter we are learning the names of some of those victims. The student, Jamie Guttenberg and the assistant football coach here, aaron feis, both killed in the shooting. The sheriff also confirmed last night that one of his deputies own son was shot and is in stable condition. Both the students and staff weve spoken with here are expressing a combination of fear over what happened, of shock and of being thankful to be alive. I dont know how were alive. Reporter freshman bruna says she and her classmates witnessed their teacher get shot. For like 30 minutes we were ju just, like, praying and crying and and then the police came and we just got out. Reporter students and teachers barricaded themselves inside classrooms to take cover. They were in the corner of the room. It was awful. Reporter sophomore nicole healy described the carnage she saw as s. W. A. T. Members led them to safety. On the way from getting evacuated, you saw the like two kdead bodies on the floor. Reporter there were tearful reunions as loved ones arrived on scene to make sure their children were okay. I certainly feel for the children that lost their lives and the parents of the children. Because im one of these parents and certainly not feeling so good right now. Reporter Broward County sheriff scott israel. Im absolutely sick to my stomach to see children who go to school armed with backpacks and pencils lose their lives. Ran as fast as i could. I made sure all my friends were around me. I just made sure we were all safe. Reporter senior hector escaped the gun field through a field with a group of more than 50 students. He believes one of his friends is among the victims. This hits very close to home. Its not easy. I know together as a family, as a school, as a whole, we can get through it. Reporter a trauma that clearly will forever be etched in their minds. Officials say they will not be releasing a full list of the victims names until all family members can be properly notified. I know you were here yesterday and will be here today as well. Thank you very much. Friends and students that weve talked to have told us a lot more about this shooter from what we heard so far. Were going to have more on that in just a moment. Swrucht a little while ago, i did speak with jim guard, a math teacher here. He locked himself and several students inside his classroom during what was happening and he talked about what happened yesterday afternoon. Right around 2 20, i heard the fire alarm go off. So i told the kids, i said, look, just hang out for a second, this could just be something accidental. Then weve got an announcement that said okay, evacuate the building, like ten seconds later. I opened the door. The kids, you know, took off. The kids are great, theyre very orderly. As im ready to leave, then we hear all these popping sounds. You know, sounded like firecrackers. And we heard mr. Porter came on again and he said code red, get back in the room. So i yelled kid, lets go, lets get back in here. There were six kid, five girls and a boy, who were right there. They said whats happening . And i said, i dont know, this might be a drill. This could be a drill. And then really 20 minutes later we knew it wasnt. So the kids went where . They were in my room. Now, all the other kids what i did was went on our email and a lot of teachers were emailing, you know, these children are with me, these children are with me. These are the ones i dont have. So i put on all the six kids who i had. And then the other kids who were absent that werent there and the kids who were missing to try to find out where they are. Meanwhile, my other kid, they all have cell phones so were all texting and we found out where the other 13, 10 of the 13 were and the other two we didnt know but we found them later on at 4 00. Were hearing stories about many teachers like you who tried to protect the students. In some cases, took them in closets. In some cases, may have shielded these students. Can you talk about your fellow teachers and thousahow theyre this morning . I dont know what news is out there, what names are out there, but i do know one of our teachers apparently well, two of them were shot and killed. One was shot and killed standing in front of kids. Which im not sure if you guys have his name released or not. Which doesnt surprise me at all. Ive known him since i got here in 2008. He was a fantastic person. He went here. He was an eagle. He went here. He was a great guy. Friends and students are describing to us the suspect as a troubled violent teenager before he was kicked out of Stoneman Douglas high. One student who knew nik cruz says he had threatened other students and began searching the home here in parkland where crews lived. Thats where Jericka Duncan is this morning. Jericka, good morning to you. Reporter the home where cruz most recently stayed is around the corner. You can see theres a heavy Police Presence on the ground and also a helicopter in the air. Now, according to the attorney for the family where nikolas cruz was staying, he was staying with that family for the last three months or so and he had been bouncing around from home to home after his mother died in november. Well, now, some friends and students who knew cruz are speaking out, painting a very complicated disturbing picture of a troubled young man. As investigators search through the home where nikolas cruz lived, new details are emerging about the 19yearolds unsettled past. They let him live here because he didnt have some place to live. Reporter attorney jim lewis represents the family who gave cruz a place to stay. They cant believe that someone who lived in their home that was so close to them for this relatively short period of time was capable of such a horrible act. Reporter lewis says cruz was getting an Adult Education and working at a dollar store where he was a cashier. He told the sun sentinel newspaper cruz legally purchased the ar15 weapon used in the attack. Its like someone would do this, you would expect it to be this kid. Reporter after the shooting, students described cruz as a loner who struggled in school. People were saying it was going to be. We actually a lot of kids threw jokes around like that, saying hes going to be the one to shoot up the school but it turns out, you know, everyone predicted it. Reporter paul gold lived next door to cruz in parkland and says the death of his adopted mother had a major impact. At times, he had so much anger and pain inside of him. Reporter gold says cruz complained about being picked on and bullied in school. Kids mistreated him. And obviously he wasnt given the best, you know, hand in life. You see that picture, what does it how does it make you feel to see that . It makes me sick. It makes me sick to think that he would do Something Like that. Reporter gold says cruzs adoptive mother did have him in counseling but that all ended according to gold when his mother passed away. Cruz is currently in custody at the Broward CountySheriffs Office. Jericka duncan, thank you very much. We are going to have much more from parkland, florida, coming up here in just a short period of time. For now, lets go back to new york. Jeff, thank you. Fran townsend is cbs News National security analyst. She was Homeland Security and counterterrorism adviser for president george w. Bush. Fran, good morning. What are investigators trying to find out from the shooter . Well, they want to understand both his mental history. We know that there was this report from video blogger on youtube back in september identifying cruz to the fbi. Difficult when i say identifying, he identified the comment. He was interviewed. The video blogger asked if he knew him. He said no, he didnt know him. This was reported to youtube and they took it down. It points to a host of issues, john. So for one, we dont think when we think of Homeland Security, we think of terrorism issues. We think of natural disasters. We dont think of School Shootings. And, you know, right now when you think of this, you know, weve had this is the 18th School Shooting this year. Last year this time, we had seven. Should we rethink Homeland Security . Because it sure feels like terrorism to me. It hurts as badly. Its just as terrible. Do we need to rethink what Homeland Security really means . I think thats exactly right. Imagine for a moment if the shooter had been a muslim. Wed be having a different exactly right. And how wrong does that feel, right . This ought to be at the top of the list. Of Homeland Security threats. Because we have an obligation to protect our children. We need to deal even though its a difficult political issue, its time for people to put that aside and really say were going to deal with it. Im interested in the Assault Rifle he used, the ar15. Which can cost about thats a lot for someone working at the dollar store. But the Mass Shootings in this country, new town, san bernardino, las vegas, the pulse shooting in orlando, sunderland springs. Do we need to have some changes at the atf and others about who can buy this type of weapon . You know, look, norah, you know better than anybody, theres been these debates about putting these restrictions. The nra says thats a slippery slope. You begin down that path. People ought to remember this was the ar, the Assault Rifle was really intended for military use, right. I think of that from my time in government as being a weapon used by the u. S. Military overseas. We understand that Law Enforcement, people in uniform, have an absolute need for it. But this is a debate. Look, we had an assault weapon ban. It expired. And the politicians in washington dont seem to be willing to continue to have that so the 19yearold who had been kicked out of school be able to buy that gun the question. No. The one issue i wanted to raise is the social media companies. In this case, youtube should take that comment down when it was identified to him. That comment exactly what he said in there, he said, im going to be a professional shooter. Right. So they took that down. But they need to do more, right. They need to provide resources, people, who go hunting on their networks, youtube, facebook, instagram, where they find this stuff. They dont just take it down, they take it down and report it to Law Enforcement. So we can try and prevent these things before they happen. The man who saw it said he was interviewed but where did it go from there . Did anybody else follow up with this cruz . We dont know if they were actually able to identify him from, you know, it is a common name. Could they interview him . Did they understand he had other social media accounts that might have triggered more concern . Thank you, fran. President trump broke his silence on Domestic Violence a week after an aide resigned amid spousal abuse allegations. Ahead, how the botched handling of rob porters scandal is creating turmoil inside the white house. More than a quarter o more than a quarter of americans reportedly admit showing up to work when theyre kick is. 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