Were learning from the gunmans brother and his neighbors, as well, as investigators move opt his home. Reporter caravans of federal agents, s. W. A. T. Teams and police descended on mesquite, nevada, the home of Stephen Paddock. His neighbors in disbelief. Just in shock, started shaking. I just cant believe someone in here would do that. I just cant believe it. Reporter police raided paddocks homes in reno and mesquite, where they used a robot to take out the garage door. Investigators found 18 weapons, explosives and thousands of rounds of ammunition in the house pad dom shared with his girlfriend. Ive seen them leave the house together, yeah. Reporter and nothing seemed out of the norm . Nothing. Im just wondering what happened to him yesterday, or a couple days, getting some mad argument or something that would cause him to just think about doing that . Reporter tonight, 2,300 miles away in florida, Stephen Paddocks family is also struggling to understand how he could commit such carnage. Theres absolutely no way i can even conceive that my brother would shoot a bunch of people. Reporter his brother says there was no Mental Illness and no warning. He doesnt even have parking tickets. He has no criminal record, he has no record of any affiliations, he has nothing. Reporter last time they spoke, just weeks ago, right after Hurricane Irma hit florida. The last time i communicated with my brother, he texted me, said, hows mom . I texted him back. Reporter paddock says he moved his brother from florida to this Retirement Community two years ago, and stephen was a wealthy gambler who owned a couple of guns, but not an arsenal. He didnt hunt, he didnt i mean, he barely shot his guns ever. He had a couple of handguns. That he kept in a safe. Reporter not far from paddocks mesquite home, the general manager of this gun shop confirming he sold weapons to paddock, but that all necessary background checks and procedures were followed. At that nearby gun store, where paddock bought weapons in the past, the general manager said he never gave an indication he was unfit. Back at paddocks home, police are scouring for any evidence of a motive. So, lets bring in ken moton tonight. Hes in mesquite, nevada. And ken, police are also hoping to talk with Stephen Paddocks girlfriend, who apparently is still out of the country . Reporter thats right, david. Shes believed to be overseas, but expected back soon to answer some important questions. And moments ago, we learned the fbi has finally left this neighborhood, but police here in mesquite plan to keep watch over paddocks home, because they believe it could contain more key evidence. David . And there are so many questions about that girlfriend when they found the i. D. In the hotel room, but again, as ken just reported, it is believed she is overseas, at least for the foreseeable feature. Ken moton tonight, thank you. We turn next to another of the gunmans family members speaking out tonight. His niece, nicole paddock, writing on facebook, i want to express my deepest sympathies to everyone affected by this massacre. Im as as shocked and appalled as anyone. I cannot speak to what would motivate someone to do Something Like this, nor what his specific motivations may have been. He never came across as religious or political. My family and i are still in shock with this news and my heart goes out to all of those who lost or had loved ones injured in this tragedy. Just moments ago, we spoke with two people that ran the Production Company that ran the concert here last night. Weapon asked them to come on the broadcast. Amy and keith conrad. Thank you for being here. I know it was supposed to be the third night of what had been an incredible three days of concerts here in las vegas. Can you describe the moment when you knew that this was actual gunfire . At the very beginning, a lot of people thought it was fireworks or something else. Yeah, we were actually on the Far Southwest side of the festival lot, closest to mandalay bay, getting ready to walk back behind the stage and we kind of heard a pop, pop, pop and one person said maybe a firecracker, and we actually saw the light up in the mandalay bay tower. And we thought, you know, the second time it went through, it really was gunfire, we said get down. The incredible thing is this suspect was relentless. There were pauses in the gunfire, when people would stand back up and make a run for it and another round would begin . That was probably the most terrifying part was just thinking that it was over, you think, okay, were okay to stand up, and then its quiet it was quiet for awhile and then you would go to crouch up and go low and it would just start all over again, so yeah. Horror that unfolded here. Your father was wearing a bag on his back, do you believe tonight that might have been what saved him . Yeah, so, you know, the president of the company and her father and he was at the front of the house taking pictures and he thought he was fine, he got in this morning, he realized that his frame was shattered in the back of his bag and it was on his back the whole time. Absolutely saved his life. That part of the camera was shattered . Yes. Were glad you are both okay and i imagine its going to take a long time for this city to heal. Absolutely. Send your father our best, too. Thank you. We continue here, and todays massacre wasnt the first time President Trump was called upon to lead the nation through a mass shooting. At this white house this afternoon, a moment of silence. All there for the solemn ritual. The president will travel here to las vegas on wednesday, but storm, he will be in puerto rico, and thats where we find abcs chief White House Correspondent jonathan karl. Reporter theres no training for Something Like this. A president leading a moment of silence for victims of a shooting so deadly, so senseless, it has shocked the nation. His predecessor saw them all too afternoon. 18 times, forced to address the nation after Mass Shootings. Responding to the horrors became a sad, frustrating, horrifying routine. There was sandy hook. 20 children. None of them older than 7 years old, murdered at school. They had their entire lives ahead of them, birthdays, graduations, weddings. Kids of their own. Reporter at the sandy hook memorial, president obama vowed a National Effort to prevent such a thing from ever happening again. Because what choice do we have . We cant accept events like this as routine. Reporter but the violence didnt stop. More than a dozen Mass Shootings after sandy hook. Including the murder of nine at the Mother Emanuel Church in charleston. Emotions so raw at the memorial that the president broke into song. Amazing grace reporter and now, President Trump faces the challenge not just of reassuring the nation after the deadliest shooting yet, but of figuring out how to prevent more. At the white house, he ignored questions about gun control. Is it time for new gun control laws . Reporter president obama tried and failed entirely to pass stricter gun restrictions. Thats unlikely to be President Trumps path, but as the tears subside, he will face the same maddeningly frustrating challenge that bedevilled his predecessor. Stopping this from happening again. And jon karl joins us tonight from puerto rico. The president will be there tomorrow, and he comes here wednesday. We heard that question, jon, shouted there at the white house about gun control. And this president now facing what president s before him faced, and this pressure to have a conversation about gun violence in this country. Reporter certainly hearing that pressure, feeling that pressure from democrats, including, david, two very familiar names, Hillary Clinton tweeting, quote, our grief is not enough. We must stand up to the nra. And we heard today from joe biden, the former Vice President , a very similar message. He tweeted, quote, congress and the white house should act now to save lives. Clearly the beginning of this conversation, david. All right, jon karl tonight on President Trump and jon, well see you from puerto rico tomorrow here on the broadcast. In the meantime, next year, this country on heightened alert after what happened overnight here, increasing security at some of the most popular Tourist Spots in the country. Police in new yorks times square making their presence known, and this new challenge, what happens when the shooter is actually on the 32nd floor or high up in a building, like what we saw transpire right here last night . Heres abcs linzie janis on that front tonight. Reporter tonight, police in one of the nations most popular tourist destinations on high alert. Security vehicles lining new york city streets. Officers armed with automatic assault reichelifles, patrollin multiple locations. The nypd says while there is no direct threat to the city, its not taking any chances. Certainly maintain our vigilance as we move into the fall, winter and the holiday season. Reporter extra officers deployed at potential targets like times square, where tens of thousands of tourists and new yorkers congregate every day. How do you feel in the wake of the Las Vegas Shooting about being somewhere like times square . A little nervous, but actually happy to see armed guards everywhere. Reporter in the last four years, the nypd, the nations Largest Police force, training for active shooter scenarios. Arming 2,000 officers with long guns. Major events here, the Police Department have people of rooftops. Theyre observing whats going on on the ground, but they are observing buildings that are across from where they are. So, its something thats always been on the radar screen for the Police Department. Reporter david, the nypd says a shooter opening fire from within a Tall Building has been something it has been concerned about. It says what happened in las vegas is a reminder for everyone to be vigilant. David . Linzie janis with us tonight, as well. Linzie, thank you so much. Next tonight here, to the toll of these Mass Shootings across this country. We wanted to show you this tonight. This bar graph that takes us all the way back to the university of texas tower shooting in 1966. All the way up through newon the, orlando and of course now las vegas. And you can see that toll only increasing over time. Abcs david wright tonight on the fbis difficult count. Reporter tonight, in las vegas, a grisly new record. We are currently standing at 527 for individuals injured and individuals that have died or passed away, 59. Reporter this is now the deadliest mass shooting in modern history. A record las vegas may not hold onto for long. Active shooter incidents are becoming more frequent and more deadly in this country. They were relatively rare when two Columbine High School students killed a dozen of their classmates and a teacher. That was in 1999. This map shows the incidents that have taken place since the year 2000. More than 230 incidents. More than 730 dead. People have access to guns and right now, in this world, there is a lot of Mental Health problems that people have and this is their solution in their mind. Reporter in fact, the four deadliest active shooter incidents all took place in the past ten years, including virginia tech, 32 people killed, sandy hook elementary, 20 first graders killed, plus six adults and the pulse nightclub in orlando, 49 people killed. That was the previous record, orlando held that record for just over a year until today. David . David wright with us tonight. David, thank you. And there were pointed words from congressman Gabby Giffords today, along with her his, mark kelly. They were at the capitol, saying that what happened here in las vegas was their worst case scenario. Weapons of war in the hands of a killer forever altering thousands of lives. And they called for action to save lives. Giffords then turning to the capitol, raising her arm and saying to her former colleagues, the nation is counting on you. Next here, inside the terror of the shooting that played out here overnight, from the first gunshots, through the hours of uncertainty, as you heard described here just moments ago. And then, that allclear, as s. W. A. T. Teams moved in on that 32nd floor behind me. And in the words of those concertgoers who feared for their lives. Listen to this. Jason aldean stopped singing. It was kind of a gap in his song. It was very surreal. I heard it, boom, boom, boom. And it kept going. Even after we left, it just kept going and going. It literally felt like it just continued for 20 minutes straight. And every time there was a break, we ran. And we ran. All the walls in the location were about 10 to 15 feet high and you just couldnt climb them, so everyone was just bottlenecked. There was no escaped. Well were penned in. It was a kill box. I just knew that the bullets were flying everywhere, and that if we got up, we could die. I saw people getting shot right in front of me. It was the scariest thing ive seen or heard in my life. We cannot forget tonight the hundreds of patients in hospitals across this city. And well have more on what happened here, in addition to the other news this monday. Much more ahead on this special edition of world news tonight from las vegas. Our coverage of the massacre. Also, the crisis in purt lee cope. President trump arriving there tomorrow. Our cameras inside the recovery effort. The president facing huge backlash for his comments about storm victims and the mayor of san juan. Also, the military plane crash here in the u. S. Two navy pilots killed. There is news coming in tonight on the investigation. And the sad headline tonight about the legendary rock star tom petty. Going into cardiac food. Water. Internet. We need it to live. But what we dont need are surprises, like extra monthly fees. I see you, fee, played by legendary actress anjelica huston. You got me, mark. We just want fast internet for one, simple rate. For all the streaming and the shopping and the newsing, but most of all. For the this. Internet for one everyday simple price and no extra monthly fees. President trump heads to puerto rico tomorrow, as we mentioned, for a firsthand look at the devastation caused by Hurricane Maria. The president under fire for the governments response to the disaster, and after what he said this weekend, that the people of puerto rico want everything done for them. The head of fema was there today, saying he didnt see anybody in a life threatening situation. Abcs alex perez is in puerto rico tonight. Reporter tonight, more federal help streaming in to hurricaneravaged puerto rico. 13,000 troops and civilians working together to hand out 1 million meals and 2 million liters of water. In this small town, still under water, fema workers delivering a Satellite Phone to the towns mayor. Fema head brock long touring sites today, telling reporters he didnt see anyone in a life threatening situation. This, after President Trump slammed the recovery response by local officials in a series of tweets this weekend, writing, they want everything to be done for them when it should be a community effort. San juans mayor firing back. You know, its just unbecoming of the values of the american people. Reporter on sunday, trump dedicating the trophy at the president s cup Golf Tournament to the people of puerto rico, texas and florida. Were going to dedicate this trophy to all of those people that went through so much. Really a part of our great nation. Reporter twothirds of residents here still dont have cell service. Chicago and alex bernard hasnt been able to reach her father in two weeks. Its been awful. Ive been calling him every single day. Reporter so, with her help, we tracked him down here in puerto rico we have a message from your daughter. And using our Satellite Phone, this dad was able to connect with his worried daughter. I love you. And i i love you, too. Reporter david, the white house says the president will be here to meet with First Responders and hurricane survivors. David . Alex perez from puerto rico tonight. Alex, thank you. When we come back, the news this evening about music legend tom petty. Also, the military plane crash. The navy pilots killed during a training mission. Investigators on the scene at this hour. And what avo but you also have a higher risk of heart attack or stroke. Noninsulin victoza® lowers a1c, and now reduces cardiovascular risk. 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