we will see you tonight. captioning sponsored by cbs >> mason: the search for a motive. >> anticipate substantial amounts of information to come in, in the next 48 hours. >> mason: the girlfriend of the las vegas gunman is called a person of interest. >> we are in conversation. >> mason: a memorial grows as the numbers become names. also tonight, the president visits hurricane victims in puerto rico. >> i hate to tell you, puerto rico, but you've thrown our budget a little out of whack because we spent a lot of money on puerto rico. we've saved a lot of lives. >> mason: and... ♪ well, i won't back down >> mason: ...remembering a rock star. >> i feel pretty blessed because i've always had a job that i loved going to. ♪ no, i won't back down

this is the "cbs evening news," reporting tonight from las vegas. here is anthony mason. >> mason: good evening. a memorial here is growing larger by the hour as mourners leave flowers and words of condolence for victims of the massacre. that outpouring of love and sympathy is in sharp contrast with another image that emerged today-- the gunman lying dead in his 32nd-floor sniper's nest amiddle the arsenal he used to kill at least 59 people. more than 500 others were injured. the sheriff revealed today the attack lasted nine minutes, and about the search for a motive he said investigators are in conversation with the killer's girlfriend, who is in the philippines. he called her "a person of interest," and said he expects substantial information in the next 48 hours.

we have extensive coverage tonight, beginning with john blackstone. blackstone. >> reporter: pictures of the pandemonium continued to show up on social media. the happy venue quickly turned into a bloody killing field as some fans dropped to the ground with nowhere safe to go. others literally ran for their lives. ( gunfire ) this cab driver was trying to drive away from the scene when she picked up some rattled passengers. >> there's a shooting. there were dead bodies everywhere! >> reporter: in response to a question from cbs' norah o'donnell, clark county sheriff joseph lombardo said 64-year-old stephen paddock had set up cameras, including one on a service cart outside the room. >> reporter: and he had set up how many cameras? >> i don't know what the specific number is. >> reporter: and for what purpose, do you think? >> well, i-- i anticipate he was looking for anybody coming to take him into custody. >> reporter: around 10:08, the shooter was in a hotel room with

a sweeping view of the las vegas strip, but he was really here for the direct line of sight into the music festival 400 yards away. at 10:13, more than five minutes after paddock fired his first shots, police realized he was inside the mandalay bay hotel and casino. a floor-by-floor search ended around 10:24 on the 32nd floor outside room 135. the spacious, vista suite paddock shot into the hallway through a closed door, wounding a hotel security guard. during the next hour, the floor was secured and swat officers arrived. >> breach, breach, breach. >> reporter: at 11:20, police broke down the door. >> we have one suspect down at 135 mandalay bay. >> reporter: police said inside paddock's suite they found 23 guns and rifles, including this one. in all, the rapid-fire shooting lasted nine minutes. >> i realize that he was a-- i seriously thought he was next door. >> reporter: chris bethel was staying two floors down and could hear what was going on.

>> the walls and the windows were vibrating. you could feel the-- kind of the compression, the sound. >> reporter: when the shooting finally stopped, those who came for a night of fun were left clinging to each other and to life. >> i haven't had any sleep. i close my eyes, i relive the moment. >> reporter: the sheriff confirmed that at least one of paddock's weapons appears to have been converted to allow rapid fire, and, he said, three of the victims remain unidentified anthony. >> mason: john blackstone. thank you, john. now to washington, where justice and homeland security correspondent jeff pegues has latest on the investigation of the gunman. >> reporter: cbs news has learned that stephen paddock recently purchased some of the 49 rifles, guns, and thousands of rounds of ammunition found in his hotel room and two residences. but investigators still have not determined why he chose to target the country music festival. >> oh, my god! >> reporter: they are also looking into whether paddock

initially had a different target. a source briefed on the police investigation said he tried to get a hotel room near a music festival featuring chance the rapper and lord a week earlier are but the specific suite he's requested weren't available. >> something happened that drove him into the pit of hell. >> reporter: today in florida, paddock's brother, eric, was still trying to make sense of what happened. >> steve is a-- was-- was a highly intelligent, highly successful person. he could have done anything he wanted to do, and he did. he made himself wealthy. he made us wealthy. >> reporter: a former accountant, paddock once worked for the postal service and as an i.r.s. agent. in recent years he spent his time gambling. leading up to the shooting, paddock transferred tens of thousands of dollars some overseas to the philippines where his girlfriend is believed to be down. marilou danley is considered a person of interest in the investigation, and it's unclear

when she plans to return to the united states. eric paddock described his brother as quirky and narcissistic. >> my heart is torn, is destroyed for all these people. i-- but i can't tell you why steve did what he did. it doesn't-- it's so far over the side of the cliff from steve that i knew. >> reporter: the las vegas sheriff says the weapons recovered are being sent to f.b.i. labs. agents have been working to document the still-active crime scenes inside the mandalay bay hotel, and at the concert venue. anthony. >> mason: jeff pegues with the investigation. thanks, jeff. among the wounded is nick campbell, a 16-year-old basketball player who was protecting his girlfriend when he was shot through his shoulder and chest. i spoke with him today in his hospital room. nick, what do you remember happening?

>> people started getting hit, some actually went down, and every timed it stopped for the guy to reload, people started moving behind walls and stuff and i got hit in the second round so i couldn't go anywhere. and someone helped my girlfriend get over the waller and once she's over i had to duck down because more bullets come behind the dead person, until it stopped. >> reporter: eventually a stranger helped stopped the bleeding. >> he picks me up and puts my on his shoulder and put me in an uber. in the uber, there was a guy that got shot in the leg, he was an army veteran, me, and his wife, wendy, who talked to me the whole time to make sure pifs conscious because if i passed out-- >> mason: make sure you didn't pass out. they came here to university medical center with the only level-one trauma center in the state. what are you thinking in the middle of all that? >> like, it didn't feel like-- when i got shot, because the adrenaline rush tdidn't hurt that bad.

it was more like i have to get the hell out of here. i have to get everyone-- make sure my girlfriend is okay. when i lost her i got scared. i was like, "where is she at?" >> mason: there's a picture over here of you with a trophy, your basketball team. you're a basketball player. >> yeah. >> mason: how are you feeling? >> mentally, i try not to think about it, like, watch tv. physically, i'm-- i'll get better. >> mason: you will. >> yes. >> she's not responsive. >> reporter: at nearby sunrise hospital, we met mary moreland, who flew in from maryland. and pearl grummet, from california. >> both our daughters got facial injuries from bullets. so we just hugged and cried and we're b.f.f.s now. >> reporter: moreland's daughter is 27-year-old tina frost. she was at the concert with her boyfriend. how is your daughter doing? the bullet went in through her right eye and up towards this. she lost her right eye. she lost the-- her whole

forehead. but she got a cat scan this morning, and there was no brain swelling, which is very good. >> mason: grommet's daughter-in-law, 37-year-old natalie grommet, is no stranger to hardship. >> she's tough. she's one of the toughest people i know. >> mason: she survived breast cancer. >> yes, she's a 10-year breast cancer survivor. >> mason: what about you? >> i'm okay. i'm-- i'm okay. i've got my faith, and my family. we're all here to support natalie. and we'll get through it. >> mason: how are you two helping each other right now? >> just trying to keep each other amused a little bit because laughter is good healing, too. >> mason: our thoughts and prayers with all those families and our thanks that they spoke with us today. police have identified all but three of the 59 who were killed here sunday night. among the lives lost, christopher roybal ofica roan acalifornia, was at the concert

to celebrate his 29th birthday. roybal had been shot at before as a navy master of arms in afghanistan. adrian murfit of alaska was a giant teddy bear, according to his friend, who was at murfit's side as he was gunned down. jack beaton from california, was celebrating his 23rd wedding anniversary. he died shielding his wife. jenny parks was a kindergarten teacher and mother of two. her husband, bobby, was also shot, but survived. denise burditus, posed with her husband, tony, at the concert before the shooting started. she died in his arms. 23-year-old jordan mcildoon was from british columnia, canada. in the confusion he had become separated from his girlfriend. but thanks to a good samaritan, the young man did not die alone. adriana diaz has more on that.

>> there were screams and there were shouts. >> reporter: bartender heather gooz was working inside a tent when she heard the shots. >> like, thousands of people came running through the front of our bar and immediately they were screaming and shouting, "shooter! shooter! gun, gun!" >> reporter: what did it look like in the tent? >> it looked like a war zone. >> reporter: she helped 23-year-old canadian jordan mcildoon who was shot in the stomach. >> his fingers were kind of wrapped on my hand. his hand, like, kind of squeezed a little bit, and then just... like, went loose. >> reporter: mcildoon had been at the concert with his girlfriend, amber. gooz spoke with her by phone. >> she said, "is he okay?" and i said, "no." and she said, "be honest with me. what's going on?" and i said, "he didn't make it." >> reporter: she stayed with his body for more than four hours, but says she's not a

hero. >> the heros to me were the ones running in to go get the people out. i did what i would hope that anybody would have done for me, that they would have made sure that i wasn't alone. >> reporter: in a statement, mcildoon's parents said their only son loved mountain biking, country music, and was rarely seen without his cowboy boots. he would have turned 24 this friday. anthony. >> mason: adriana diaz. thank you, adriana. by one estimate, paddock fired off as many as nine rounds per second. carter evans looks at how he might have turned a rifle into a rapid-fire weapon. he shows us how it works. >> reporter: this is not an automatic weapon. >> woooo"h." >> reporter: but it's been modified to shoot like one, and it's completely legal. it's done with a simple plastic device known add a bump stock that converts a semi-automatic

rifle to perform leak a fully automatic one. a semiautomatic rifle requires the shoot tore squeeze the trigger each time to fire a bullet. law enforcement officials say the las vegas gunman used a bump stock to divert at least one of his guns. photos from inside his room show two ar-15 rifles on the floor. experts believe this one has the device installed. >> it's not an automatic gun. the gun itself has to recock every time, and the trigger has to be pulled every time. >> reporter: but gun range owner frankie mccrae demonstrates how a bump stock allows continuous firing as the gun slides back and forth on the stock. >> so basically when you place your trigger finger on the trigger here in this little groove, you're basically pressing against this and holding there, and the trigger itself is trapped down inside. >> reporter: the bump stock allows a shooter to fire hundreds of rounds per minute, says robert ferago, publisher of the truthaboutguns.com.

>> it is night practical device but it is one that allows people to experience the simulation of fully automatic fire. >> reporter: the devices are made by several manufacturers. in nevada, there is no permit, background check or a waiting period to buy one. we picked one up at this gun shop in vegas for less than $200. >> will people who buy this buy is as a kind of toy. it's not a practical device. >> reporter: now, it's illegal for civilians to purchase fully automatic weapons made after 1986, the year they were banned. these are widely available online, and lawmakers have attempted to crack down newscast, but a ban to-- then attempt to ban bump stocks back in 2013 did not pass. anthony. >> mason: carter evans. thank you, carter. coming up next on the cbs evening news, the president visits puerto rico. and later, a look back at the career of rock idol tom petty.

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>> mason: president trump will be here in las vegas tomorrow to meet with first responders and families of the massacre victims. today, he was in puerto rico with victims of the hurricane. david begnaud is there. >> flash lights! you don't need the them anymore! >> reporter: president trump seemed unaware that 94% of the island is still without power. he handed out supplies like prizes, lobbing paper towels into the crowd. >> how did your house do. >> reporter: fraifnged lie the first lady, mr. trump toured one of the suburbs. the trump administration has been criticized for a slow response following hurricane maria, but today, the president awarded himself an a-plus, and congratulated local officials on the relatively low death toll-- 16-- compared to what he called a real catastrophe like katrina. mr. trump also reminded the island of its debts.

>> now, i hate to tell you, puerto rico, but you've thrown our budget a little out of whack because we've spent a lot of money on puerto rico, and that's fine. >> reporter: one place the president did not see is the prurl town of utuado, a two-hour drive from san juan, and a world away from relief. here, more than two weeks after the storm, there is no running water, and people are drinking and bathing with water from a stream. in the capital of san juan, some were unhappy with mr. trump's visit. >> it's just like he is showing off. it's a show. >> i don't see that what he said was appropriate to what we are suffering now as a country. >> reporter: one of the president's fiercest critics has been the mayor of san juan, who said in the past, "you're killing us with the inefficiency." but today she met with white house officials and walked away saying they really seemed to understand the disconnect between, as she put it, how things are supposed to happen

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>> mason: tom petty once told an interviewer, "music is the only true magic i've found in this world." he worked his magic for generations of rock fans. petty died yesterday after being found in cardiac arrest at his california home. he was 66. ♪ well, she was an american girl >> mason: tom petty made his recording batue with the heartbreakers in 1976 and went on to sell 80 million albums. ♪ don't do me like that don't do me like that ♪ >> mason: in 1999, petty told charley rose on his pbs show

that rock 'n' roll music was his life. >> reporter: how long do you want to do this? >> oh, as long as they'll put up with me. >> mason: so this is your office? >> well, yeah, i guess you could call it that. >> mason: we visited petty in 2009 for "cbs sunday morning" in a warehouse where the band often practiced. we counted before, 144 guitars. >> and you only need one. >> mason: what happened? >> it got a little out of hand ♪ well i won't back down >> mason: petty had a defiant streak. he once fought his record company when it tried to raise the price of an album $1, to $9.98. he won. there is this theme running through a lot of what you've done and through your music, the whole "i won't back down" theme. >> yeah. i just like things to be right. ♪ everybody's got somebody to lean on ♪ >> mason: in the 1980s, he joined other hall o hall of fam-

george harrison, bob dylan, roy obrison, and jeff lynn-- to form the traveling wilburys ♪ i'm just glad to be here >> mason: dylan called petty's death "shocking, crushing news." petty once said inspiration is everywhere. his lyrics represent his life's experience. >> i knew early on thatimented to do this when i was really young. so i feel pretty blessed because i've always had a job that i loved going to. ♪ gonna leave this world for a while ♪ and i'm free falling free falling ♪

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>> mason: we hear it over and over again from the families of victims, that the response to the tragedy here in las vegas has been overwhelming, people wanting to help the victims in any way they could answered a call for blood donations in enormous numbers. they waited in line patiently under hours. one donor said she got in line in the morning yesterday, stayed until 7:00 at night, and then had to come back this morning. today, people were being told there is enough blood now for the injured, thank you, though donations are always appreciated. amid all the death, the good people of las vegas offering the gift of life. it has been an exceptional response by the people of this city. that's the cbs evening news. i'm anthony mason in las vegas. thanks for watching. good night. captioning sponsored by cbs captioned by media access

escaping the the massacre. >> go, go, go! >> in a cab. >> come on! >> then, first video of the killer. his slip and fall accident in vegas. did it fuel his rage? and, exclusive. inside the sniper's nest. the weapon. the discarded food tray. and countdown to terror. ♪ god bless america >> they had no idea what was to come. and the show must go on. >> are you anxious to get back on stage? >> the outpouring of love and grief. >> we have