Carrying two concealed devices. And the mother put behind bars tonight after refusing to vaccinate her son. Its now believed he will be vaccinated while shes locked up. Good evening on this wednesday night from las vegas. And as we come on the air, we are following breaking news. Abc news has learned of the gunmans extraordinary planning. Possibly checking into multiple hotels before the attack, all within shooting distance of that concert site. Just as we also see the Police Response through their body cams. The officers taking cover, then jumping into action. Inside that hotel room, images of his deadly arsenal. 23 weapons. Hundreds of rounds of ammunition. And we have new reporting tonight on the Security Guard, the first person to get to that hotel hallway, to the door of that hotel room. Before the gunman shot him right through it. That guard, still able to tell police hed found the gunman. Abcs Senior National correspondent matt gutman leading us off tonight. Reporter tonight, Police Body Cameras reveal officers risking their own lives amid unceasing gunfire. Get down go that way get out of here, theres gunshots coming from over there. Go that way reporter with sirens blaring and bullets flying, officers huddled behind a wall, trying to pinpoint the source of the mayhem. North of the mandalay bay. Coming out of a window. Reporter exhibiting extraordinary calm, those officers directing concertgoers away from the shooting to safety. This way, this way, this way. Go, go, go. Reporter it would be an hour before police breached stephen paddocks luxury suite. Tonight, these photos revealing their destructive power. This assault reichel, one of 12 outfitted with an attachment called a bump stock. This video common straiting how it works. On the tip of the rifle, a flash hider, making its fiery blast difficult to spot. And in the corner, a pile of 17 magazines holding 100 rounds each. Youre looking at 1,700 bullets. Pad dom dock installing his own surveillance camera. All rigged so he could see police approaching. And now, we are learning he spotted a Hotel Security guard. He was advancing towards the room when the suspect fired through the door at the Security Guard and struck him. Reporter tonight, that Security Guard identified as jesus campos. Somehow he was able to get away and tell the Tactical Team that pad dom was in room 135. An hour later, they breached the door. Breach, breach, breach. Reporter and discovered him already dead. Tonight, federal Law Enforcement sources telling abc news they are investigating reports that the day before the massacre, he checked into multiple hotels overlooking the concert venue. And he may have looked for other opportunities. Federal sources say he looked into renting a room in this building right next to another Music Festival just the week before. And from this perch he would have had a clear field of fire right down into those tens of thousands of people packed into that concert below. But for some reason, he didnt pursue the plan, instead, he waited a week for the harvest festival. And matt gutman joins us live tonight here in las vegas. Matt, we now know he may have had several Hotel Options for this attack, ument matly spending more than three days in the Mandalay Bay Hotel behind me. And youre learning what he might have done the day before . Reporter thats right, david. Were learning he wasnt just shuttered up in that luxury suite in that hotel. Now, Law Enforcement hasnt weighed in on this yet. I spoke to a casino with worker who said they saw him play high stakes video poker for eight continuous hours the morning of the attack. 16 hours that weekend. And what takes many so disturbing is that it means he was milling about with the public, out in the open, for days before the attack. David . Matt gutman leading us off tonight. Matt, thank you. And the other major development, the gunmans girlfriend, she is back in the u. S. Tonight, being questioned by the fbi. Her brother telling abc news that she assured her family she has a, quote, clean conscience. But tonight, she remains a person of interest, as they now ask, how the gunman assembled such an arsenal without anyone noticing. Heres abcs chief investigative correspondent brian ross. Reporter tonight, just 12 hours after she arrived on a flight from the philippines, the shooters longtime girlfriend, Marilou Danley told the fbi, according to Law Enforcement officials, that she had no knowledge of his plans or his purchase of so many guns. Her lawyer read her statement after the fbi session ended. He never said anything to me or took any action that i was aware of that i understood in any way to be a warning that something horrible like this was going to happen. Reporter danley had been paddocks livein girlfriend for at least three years. He met her when she was a casino hostess. They gambled together, playing video poker and the slots. Investigators want to know if he went along when she traveled to dubai, where she posted this smiling photo. According to her sisters in australia, who wanted their faces blurred, no one knows more about paddock. No one can put the puzzles together. No one. Except marilou. Reporter the sisters said paddock who sent her to the philippines just two weeks before the shooting. He sent her away. So that he can plan what he is planning without interruptions. Reporter authorities now are putting together a psychological profile of the shooter. A 64yearold onetime accountant and irs agent, who claimed to be a multimillionaire. But investigators say a picture is emerging of a man descending into madness, losing weight, diminished physical appearance, what are described as crazy eyes. Coupled with easy access to the powerful weapons he began to accumulate at least a year ago, a deadly combination. Brian ross with us live from new york tonight. And brian, we heard your report there, the shooters girlfriend spent hours today talking to the fbi. But she is denying knowing anything about this plot . Reporter yes, david. Officials say she claims she had no idea about the dozens of guns her boyfriend bought over the last year, and as you said, her brother tells abc news, she told her family she has a clean conscience, david. Brian ross and your team. We thank you again tonight. President trump, meanwhile, was here in las vegas today. It is the first time hes had to visit the scene of a mass shooting, meeting with sure voi vors. What he said to doctors and nurses here, and what hes now saying about gun control. Abcs senior White House Correspondent cecilia vega, also here in las vegas. Reporter in las vegas today, president trump, in a new role comforter in chief. With the first lady by his side, their first stop, the hospital treating dozens of patients, still fighting for their lives. Some were very, very badly wounded and they were badly wounded because they refused to leave and they wanted to help others because they saw people going down all over. And its an incredible thing to see. Theres tremendous bravery. Reporter the focus on those survivors. But this was also a thank you tour. It makes you very proud to be an american, when you see the job that theyve done. Reporter at the command center, surrounded by first responders, the president praising their heroism, like these dispatch operators who answered those frantic calls for help. Calm and strong, sharp. Reporter for the shooter, he had harsh words. Hes a sick, ghanted man. Reporter and for the nation, a message of unity america is truly a nation in mourning. Reporter and hope. Americans defied death and hatred with love and with courage. Reporter but as the debate about guns in this country grows louder, the president himself, not willing to go there, not today. Does america have a gun violence problem . Were not going to talk about that today. And cecilia vega joins us live tonight. Cecilia, the president said any discussion about guns will come down the road today, but on capitol hill today, there was a lot of focus on what are called bump stock attachments that matt reported on, that can essentially turn assault rifles into automatic weapons. And there is word tonight that senator grin feinstein and two republican lawmakers are talking about legislation to ban them . Reporter yeah, david. A handful of Senate Republicans seem open to the idea of holding hears on this subject. A Similar Movement is in the house, as well. But Mitch Mcconnell says its premature to be talking about this. A vote seems like a long way off. Cecilia vega with us here in las vegas tonight. There was an extraordinary mare moment that played out here taeshgsd after an interview we brought you last night here. A son, who was at the concert for his 21st birthday, he was shot, and then saved by a young man who held pressure to his wounds all the way to the hospital, staying next to him in the e. R. He told us he wanted to meet that hero, and someone heard that last night. Tonight here, the list of heroes, and what happened in that very same hospital room today. Tonight, the new stories now emerging of the quiet heroes who saved so many lives here. Mike kordich, a firefighter, was giving cpr to someone when he was shot in the arm. I kept doing chest compressions with one arm until i noticed i was starting to bleed a lot. Reporter nurse natalie vand vanderstay hit by a bullet and shrapnel. Concertgoers gettinger to the hospital, keeping pressure on her wounds. If it wasnt for that cab driver i wouldnt be here. And i dont know who he is. Reporter there was 5yearold aden huser, separated from his mother when the shooting began. I lost her and i was sad, i didnt know where to run. Reporter when a stranger, lindsey rogers, saw him standing alone, she stayed by his side. He was really brave and really good. Reporter lindsey and a friend posting this photo on facebook. His relatives saw it. Hes been reunited with his mother. And it was last night here, we walked into a room at Desert SpringsHospital Medical center here in las vegas, where sheldon mack is recovering. He was at the concert for his 21st birthday. It just keep seeing it in my mind still. It haunts me. Reporter you see it all playing out still. Yeah. Reporter he told me about the man who saved his life. Some hero came and save me. And throw me in and take care of me. Reporter that hero holding his finger to the bullet wound. The guy that was by your side, you havent been able to find out where he is no. Reporter who he is . Yeah, i need to. I i owe him a beer, at least. Yeah, i really appreciate all hes done for me. Reporter thats a pretty good tradeoff. Sheldons parents telling us, they want to meet that hero. Hes an angel and saved him. He was shot in the leg, as well. Reporter it turns out, friends of that hero were watching the news last night. Jimmy grover, a 25yearold paramedic from orange county, california, was here in Las Vegas Visit iing. And today, he paid another visit, walking into that room on crutches. Jimmy revealing he knew sheldon was in trouble after being shot in the arm and then the bullet piercing the abdomen, as well. And he rode with him in a truck all the way to that e. R. Sheldons mom, grateful. And afterward, there was one more reunion in that same room. Eric frazier, the marine vet who drove both jimmy and sheldon to the hospital, it turns out that marine vet rushed a dozen victims to the e. R. That night. And tonight, the survivors family and the heros family, all together after the horror. And by the way, sheldons dad told us tonight that his son told his hero, jimmy, hes going to make good on that promise of a beer, and soon. And while the president was here in las vegas today, he was also asked about something else. About a report that his secretary of state, Rex Tillerson, called the president a moron after a National Security meeting. The president s response today, and the secretary of state, Rex Tillerson himself, coming before the cameras today. Heres abcs chief Global Affairs correspondent Martha Raddatz tonight. Reporter secretary of state of state Rex Tillerson today making a rare, impromptu appearance. There are some news reports this morning that i want to address. Reporter a report rocketing around washington. Nbc news reporting tillerson had called trump a moron last july, after a National Security team meeting and was then on the verge of resigning. The Vice President has never had to persuade me to remain as secretary of state, because i have never considered leaving this post. Reporter and that report of calling the president a moron . Can you address the main headline of this story that you called the president a moron, and if not, where do you think these reports are im not going to deal with petty stuff like that. Im just not going to be part of this effort to divide this administration. Reporter not a flatout denial, but his spokesperson later, more definitive. He did not say that. Reporter the full court press pleasing the president. Yeah, im very honored by his comments. It was fake news. It was a totally phony story. Thank you very much. It was made up by nbc. They just made it up. Thank you, all. Total confidence in rex. Reporter but trump and tillerson have appeared at odds with one another recently. Just last weekend, after tillerson said dialogue with north korea was possible, trump tweeting, i told Rex Tillerson, our wonderful secretary of state, that he is wasting his time trying to we gauche yat with little rocket man. Save your energy, rex. Well do what has to be done. And so martha, a very Public Statement of loyalty from Rex Tillerson, but a leading republican senator did say today that tillerson hasnt always had the backing he deserves . Reporter thats exactly right, david. Republican senator bob corker, chairman of the Foreign Relations committee, said tillerson isnt getting the support he needs from the administration, adding that tillerson, secretary mattis and john kelly are the people who, quote, help separate our country from chaos. David . Martha raddatz with us tonight. Thank you, martha. Were following two new tropical systeming brewing tonight. One of them growing stronger. At this hour, on track to make landfall in the u. S. On sunday. Lets get right to rob marciano. Rob . Reporter hey, david. They are both pretty close to home. What will develop and strengthen is this disturbance south of the honduras nicaragua border by 180 miles. Tropical storm warnings up for those two countries. Potentially as a category 1 hurricane on saturday, making landfall on sunday. But our computer models all over the place. Anywhere from east texas to west florida need to be wary of this storm. David . All right, were watching. Rob, thank you. There is still much more ahead on world news tonight this wednesday. The mother of two behind bars tonight, orderered to spend a week in jail. Her defiant showdown with a judge, refusing a court order to vaccinate her son. We want your opinion on this one. Newly released surveillance tonight in new york city. The bomb suspect allegedly carrying two concealed devices through one of the busiest train stations in america. And the Chemical Plant explosions. Smoke and flaming filling the air. 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