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People and wounding almost 500. will carr is live in las vegas with the latest. will. >> reporter: chris, authorities say as paddock was perched on the 32nd floor of mandalay bay, he left a note on his night stand. now "60 minutes" reporting that note had calculations so he could maximize his accuracy as he fired down upon the crowd. and when that happened, thousands scattered. people raced over in this direction. they physically pushed down this fence, and then they ran over onto airport proper...

Account of the moment that played out right after the final gunshot stopped firing, a small group of officers raced up to the 32nd floor of mandalay bay, and one man made it inside stephen paddocks room, they found power tools, and notes with calculations that showed how he could maximize the shooting accuracy and guns everywhere. >> so many guns, so many magazines, stacks and stacks of magazines everywhere, and suitcases all neatly stacked against pillars that were in the room, all stacked up. ...

And your runners. >> i do like that psychological input while an athlete is performing their activity. >> are there any other downsides that come with this technology? >> technology can be a added stress. your heart rate doesnt get to the rate that you would like. those type things can lead to a person feeling depressed or feel like they failed. >> there you go. >> rings are another way to help track your activity. there are many out there and this is from motive. >> i like its light and comfort...

On concert-goers from the 31nd floor of a hotel. this last vice president mike pence traveled to las vegas top offer mope. >> no act of violence will ever diminish the strength and goodness of the american people. arthel: will carr is there with the latest on this investigation. reporter: authorities say paddock left a note on his night stand. there were calculations so he could maximize his accuracy as he was shooting down on the crowd. they are posting billboards across las vegas. also we are ...

Last sunday night killing 58 people and wounding almost 500. will carr is live in las vegas with the latest. will. >> reporter: chris, authorities say as paddock was perched on the 32nd floor of mandalay bay, he left a note on his night stand. now "60 minutes" reporting that note had calculations so he could maximize his accuracy as he fired down upon the crowd. and when that happened, thousands scattered. people raced over in this direction. they physically pushed down this fence, and then they...

1800 call fbi. lets get the very latest now. good evening to you. whats the latest? what do you know? >> reporter: well, you just sort of mentioned it there, don. there is that frustration that they still dont have an answer to why the so in the absence of that, investigators are trying to build a profile on this gunman. we are learning that they are looking at his foreign travel. his travel specifically on cruise lines. he took 20 cruises to europe, to the middle east. nine of them with his gir...

If he adapted those to make more rapid firing like a automatic weapon that is also illegal under federal law, right? >> depends how the adaptation is done. it appears he used something called a bump stock is currently legal under the federal statutory definition. that is something the congress should have hearings on. >> lets talk about that because that has gotten a lot of attention. why would have normal person who has a rifle want to use a bump stock? >> for people that want to go to the rang...

From brian todd that the fuel tank was the first thing shot at before even the crowd. if in fact was aiming for the fuel tank there erroneously thinking he could below it up, whats that tell you about it. >> lets unpack a few things. first of all, the tracer rounds that he attempted to purchase, we know he went to a gun show and was not able to do so. tracer rounds have a little incendiary device on the end of them and they generally come in a four to one ratio, four regular rounds, one tracer r...

Numbers, and what were those numbers. theyll feed to be a corroboration to make sense out of that. >> the fuel tank was the first thing shot ate before the crowd, if in fact it was aiming for the fuel tank there, e erroneously thinking he could blow it up, what does that tell you about it? >> first of all, the tracer rounds he attempted to purchase and wasnt able to do so, they have a device on the i know of it and they come in four to one ratio. it was very difficult to see the multiple flashes...

Jamming of the rifle. >> i wonder if the tracerammo was in the bump stock guns that jammed. 12 of the 23 weapons in the room had bump stocks. we know from a report that he did buy this tracer ammunition. thats significant. that allows the shooter to see where the bullets are landing in the crowd and increase his accuracy. every 4th or 5th bullet would show where it landed. it could have made the situation for deadly. it would make the weapons more likely to jam. maybe that happened. maybe thats ...