tracer ammunition. it s a type of bullet that would show the gunman where he was shooting and what he was hitting. around the same time, he tried to buy the deadly ammo. he booked two rooms overlooking popular music festivals including one in chicago and another in las vegas. frightening details add more pieces to an already complicated puzzle. even as they learn more about the shooter and what he did in his final weeks, they still can t find a clear motive. they are hoping, however, that this single note left on the table in the gunman s hotel suite will offer answers. the note reportedly contains numbers that investigators are currently trying to decipher. certainly that could be critically important. let s go straight to brian todd who is live in las vegas. you went inside a room at the mandalay bay and got a similar view to the that the killer would have had. tell us about that.
note left in his hotel suite that was reportedly a series of numbers. so far no major clues about motivation. we have learned that the killer may have been casing other locations before sunday s massacre. we have also learned that the killer tried but failed to buy tracer ammunition at a gun show in the last few weeks. that would have allowed him to see what he was shooting more accurately. meantime, thousands of people turned out for a candlelight vigil honoring the fallen las vegas off-duty police officer. we know the identities of all 58 killed in the sense attack. let s begin with jean casarez. reporter: you re so right. law enforcement continues to not say anything about motive. a law enforcement source said it is is not believed his gambling hab habits had anything to do with the shooting.
las vegas. these are americans putting our spirit into action, can t get enough of hearing about how many lives they ve saved. we are more than four full days into this investigation, the deputy director of the fbi has said they still do not have an obvious and clear thumbprint which is frustrating to a lot of people. it is entirely possible that this killer wanted to go down in infamy for horrendous act of evil. it is increasingly clear that he just wanted to kill as many people as possible. we ve been reporting on his booking rooms in chicago and boston, most likely in an effort to create the same type of carnage. there is a report he tried to buy tracer ammunition at a phoenix gun show a couple of weeks ago but the dealer was sold out. tracer could have been even more accurate and deadly, it would ve shown the killer where those bullets were landing.
this nature normally leave some sort of note or evidence or some sort of explanation of why? reporter: yes. from what we have seen from mass shootings around the country, the more famous or deadlier shootings, there is a manifesto left behind that lets us know what that motive is. on this one at this point that doesn t appear to be the case. they are looking for it. very, very hard. a law enforcement official told cnn the gunman tried to buy tracer ammo before the attack. what does that tell you? reporter: well, it tells me he knew what he was going to be doing. tracer ammunition is the type of ammunition that allows for more accuracy. if you are shooting from great distance with automatic or semi automatic type of firing. it probably would have made his shooting even more deadlier than
homicide plan that to do something like this, he doesn t want to crawl away and live in a home in illinois afterwards. he wanted credit for this. he wanted people to know who exactly that he was. that really does go to a strong powerful sense of grand youscy, even coming from secretive, you could have the same two traits in one individual. he wanted to kill a lot of people, damage that hotel and get credit for all of it. that s very clear. some of the motive obviously unclear but we are learning something the gunman tried to purchase, that being tracer ammunition, which is fos forrous tips, he tried to buy it in arizona, couldn t buy it with the other ammo, it wasn t available from the seller. as i understand he could have purchased that in nevada but in