the fbi and atf now responding. [gunfire] fighting between the israeli army and hamas intensifies, as most of gaza becomes a battlefield. >> israeli forces are hammering targets behind me. they say they are now operating across the gaza strip. >> norah: record floods hit the northwest. the rescues underway with more rain in the forecast. >> meta is facing a disturbing new lawsuit. the social media giant accused of enabling the exploitation of children. the alarming details in our exclusive tonight. ♪ ♪ >> norah: and remembering legendary producer norman lear, who brought us iconic sitcoms. [singing] [applause] ♪ ♪ >> norah: good evening to our viewers in the west, and thank you for being with us. we want to begin tonight with new developments in a shooting on a college campus just hours ago. we are just learning from law enforcement that multiple people were killed after a gunman opened fire inside the business school at the university of nevada, las vegas. tonight, we have new reporting on the gunman, and we will hear from students who barricaded themselves inside classrooms to stay safe. the active shooter not only caused a lockdown on campus, but a temporary shutdown of the airport in las vegas, which is just miles from the strip. vanessa murphy from our cbs affiliate in las vegas has the new details. >> the suspect, at this point, is deceased. [sirens blaring] >> reporter: sirens blared through the streets of las vegas... [sirens blaring] as officers responded to reports of an active shooter at unlv shortly before noon. >> we have one patient right now. supposedly, we have more patients inside with an active shooter. >> reporter: campus police sent out alerts to students and faculty, telling them about shots being fired in the beam hall building and ordering them to run, hide, fight. >> honestly, everyone was just panicking. we were just having normal classes, and all of a sudden, someone said "active shooter" running across -- >> reporter: this unlv student says he and other classmates in a nearby building used tables to barricade themselves inside a classroom. >> i am still scared out of my mind right now, and i'm not even a person that get scared like that. >> reporter: as the campus of more than 30,000 remained on lockdown, those off-campus used their phones to keep in contact with panicked loved ones. >> our teacher just locked up the room, said they are not letting nobody out. i wish i could trade spots right now because, no, that's crazy, she doesn't deserve to be in there right now. >> there are a lot of additional calls coming in that students hunker down, they are afraid, they are scared. our officers are going unit by unit, building by building, making sure we don't have any additional victims. >> reporter: some students were let out in formation, as others reunited with family. >> people are scared now because every time you step on a college campus, there are shootings every single year now, and it is just getting scarier and scarier for us students. >> reporter: the scene here remains secured. we have been talking with students leaving campus. some of them were in hiding. they tell us they receive emergency alerts on a regular basis. this time, they learned it was the real thing. a lot of raw emotion here tonight. norah? >> norah: vanessa murphy, thank you very much. turning overseas to the war in gaza. tonight, israel announcing it is closing in on the man they say is the mastermind of the october 7th attacks. just tonight, the prime minister released this video statement, saying the idf is currently surrounding the southern gaza home of yahya sinwar, that is hamas' gaza chief. cbs's chris livesay has the latest tonight from jerusalem. [explosion] >> reporter: from the north to the south in khan younis... house-to-house fighting, with the israeli military hunting down hamas fighters. israeli forces are hammering targets behind me. they say they are now operating across the gaza strip, leaving vanishing options for hamas fighters to flee, but also for civilians. some 600,000 people have been told to evacuate, according to the united nations human rights chief, who says life in southern gaza has become apocalyptic. sammer soukar, displaced for the fifth time, washes her baby, just ten days old. "what did she do to deserve being in a tent? i named her innocence because she didn't do anything to deserve this." at a khan younis hospital, saba magnam desperately searches for her father. and in a moment, tears of sorrow turn to rare tears of joy. rarer still, since the collapse of the seven-day cease-fire, when more than 100 hostages were freed from hamas captivity, like mia leimberg, and her dog, bella. leimberg giving her first interview. >> she was a huge help to me. she kept me busy. she was moral support, even though she didn't want to be. [laughs] but yeah, and i am just so happy that i managed to do this journey with her. >> reporter: but the rage of other freed hostages is boiling over. in leaked audio of a meeting with prime minister benjamin netanyahu, one woman is heard complaining of the feeling that "no one was doing anything for us. i was in a hiding place that was shelled. and an israeli helicopter shot at us on the way to gaza." and tonight, the situation is growing dire for palestinians trying to flee southern gaza. egypt has now deployed thousands of troops to prevent potential refugees from storming what has become the last exit out of the strip. norah? >> norah: chris livesay, thank you. turning now to the severe weather causing havoc across the pacific northwest. a powerful atmospheric river drenched parts of washington and oregon with up to 9 inches of rain. cbs's carter evans reports authorities are investigating the deaths of two people found in flooded areas. >> reporter: rapidly rising floodwaters led to this dramatic rescue in western washington. the coast guard lifted five people to safety after they were stranded by rushing water. in oregon, officials are investigating the deaths of at least two people whose bodies were found in swollen creeks. washington's stillaguamish river peaked at over 21 feet, setting a new record. in neighboring stanwood, emergency crews fill sandbags to help fight the flooding. jason toner is stanwood's police chief. >> it has been probably 15 years since it has flooded into the city this much. >> reporter: and it looks pretty deep, 5-6 feet, at least. >> about 4 feet, what gets to the field is about 6 feet. >> reporter: and some drivers are risking washed out roads. >> i am watching every single one of these people is ruining their transmissions. >> reporter: a landslide forced amtrak to cancel service between seattle and portland for a second day, and saturated ground led to the collapse of this section of a state highway in washington's cowlitz county. you can see these cars here still underwater. some homes flooded, too. the good news is the water here is starting to recede, but the national weather service says some rivers won't go below flood stage until later this week. norah? >> norah: carter evans, thank you very much. now to some breaking news. tonight, the u.s. military is grounding its entire fleet of osprey aircraft, while it investigates a crash in japan last week that killed all eight u.s. airmen on board. four osprey crashes in the past two years have killed 20 u.s. troops. the aircraft, which takes off like a helicopter and flies at high speeds like a plane, has been a workhorse for multiple branches of the military. there are some major political news from right here in washington that impacts republicans' already slim majority in the house of representatives. former speaker kevin mccarthy today revealed he is resigning from congress at the end of the year. that's two months after he was booted from his leadership role. and tonight, the campaign for president is being rocked by remarks by donald trump, who was asked in an interview to deny that he would abuse his power if reelected. instead, the former president answered in the affirmative, admitting he would be a dictator, but only on day one. was it a joke, or an example of saying the quiet part out loud? here is cbs's robert costa. >> reporter: today, president biden said there are probably 50 democrats who could beat former president donald trump. >> i'm not the only one that could defeat him, but i will defeat him. >> reporter: but last night, trump was already previewing a possible second term. given two chances to push back against democrats who say he is a threat to democracy he had first deflected. >> do you in any way have any plans whatsoever if reelected president to abuse power? to break the law? to use the government to go after people? >> you mean like they are using right now? >> reporter: then asked to clarify... >> you are promising america tonight, you would never abuse power as retribution against anybody. >> except for day one. he says, you are not going to be dictator, are you? i said, no, no, no, other than day one. we are closing the border, and we are drilling, drilling, drilling. after that, i'm not a dictator. >> reporter: inside, the g.o.p. sources tell cbs news there are worries that trump is leaning into rhetoric that could alarm some voters. but other republicans are mostly shrugging off trump's comments. >> i sort of laugh and think he is trying to entertain his base. >> reporter: on tuesday, during a fundraiser in boston, the president suggested he might not have run if trump wasn't running. he then expanded on his remarks. >> would you be running for president if trump wasn't running? >> i expect so, but look, he is running, and i have to run. >> would you drop out if trump drops out? >> no, not now. >> reporter: all of this comes ahead of tonight's fourth republican primary debate here in alabama, which trump will skip. sources tell cbs news they expect the contenders to be asked about trump's latest comments, but revealingly, these contenders will not focus on them. norah? >> norah: robert costa, thank you. now to a cbs news exclusive. in a new disturbing lawsuit against meta, the parent company of facebook and instagram, new mexico's attorney general is accusing the social media giant and its ceo, mark zuckerberg, of enabling child sex abuse and trafficking on its sites. cbs news senior editor and business technology correspondent jo ling kent reports on the undercover investigation that used ai. >> it was shocking, quite frankly, to see the explosion of sexual interest in these kids, almost immediately. >> reporter: new mexico attorney general raul torrez says his investigation into meta found that facebook and instagram's algorithms created a marketplace for the sexual exploitation of children. the civil lawsuit alleges meta enabled adults to find, message, and groom minors, soliciting them to sell pictures or participate in pornographic videos. law enforcement set up an undercover operation, using test accounts like this one, showing ai-generated photos of a fictional 13-year-old girl from albuquerque. the complaint says followers flooded the account with unsolicited messages, filled with pictures and videos of genitalia, which she received at least 3-4 times per week. >> i don't think they have a deep appreciation for how many predators there are in these spaces. >> reporter: if you are a predator today, are facebook and instagram the best places to do business? >> absolutely. absolutely. there are simply not enough safeguards in place. this is a place where predators have the upper hand. >> reporter: meta declined to comment on the lawsuit, but said in a statement, it uses sophisticated technology to help root out predators and disabled more than half a million accounts in a single month for violating child safety policies. >> the message to parents nationwide should be that they can't trust that meta is a safe place for their children. period. >> reporter: now, child predators unfortunately are present across social media platforms, and the new mexico attorney general says they will investigate other companies, but looking ahead, mark zuckerberg is set to testify before the senate judiciary committee next month on child safety, and he will be joined, along with the ceo of x, formerly twitter, snap, and tiktok, norah. >> norah: parents are very interested in this. jo ling kent, thank you so much. in another major development tonight, republican senators blocked a white house request for more than $100 billion in emergency aid, primarily for ukraine and israel. there is money in that bill for the border, but conservatives are demanding big policy changes. cbs's nancy cordes is at the white house. all right, nancy, so what is it that the republicans want? >> reporter: norah, what they want are sweeping concessions on immigration policy. the president had some harsh words for them here today. he said ukraine is going to lose its fight against russia without more american help soon. and he said the failure to provide that assstance before the holidays would be the best gift that russian president vladimir putin could get. here's the issue: many republicans in congress actually support the $61 billion the white house is seeking for ukraine. but they are vowing to vote against it until they secure those sweeping changes to u.s. border policy in the face of a record number of migrant crossings this year. democrats called their plan extreme. so, we are now in a situation where past u.s. assistance to ukraine has all but run out. the white house has promised ukraine and all of its allies that more help is on the way, and yet now, this is all tied up until the two sides can work out something on immigration, an issue that has divided them bitterly, norah, for decades now. >> norah: nancy cordes at the white house, thank you. well, now to the death of an american icon, who changed the face of television. famed writer and producer norman lear died last night at the age of 101. lear is being remembered as a champion for social justice for using comedy to shine a light on prejudice, intolerance, and inequality. rob reiner, who costarred on "all in the family," said "i loved norman lear with all my heart. he was my second father." many of lear's hit sitcoms aired right here on cbs. in a statement, cbs said, "norman's broad impact on our industry is surpassed only by his personal influence on the lives of people he touched at every level of our business." in a rare move, all of the networks are airing a special on-screen tribute to lear ahead of tonight's prime time programming. cbs's bill whitaker looks back on his life and legacy. >> my name is norman lear. [applause] >> reporter: for a time, on television, norman lear was king. ♪ i know where glenn miller played ♪ his reign began in 1971, when he created an insurgent little sitcom, "all in the family." the language was shocking. >> now let me tell you something. if your spics and your spades want their rightful share of the american dream, let 'em get out there and hustle for it just like i done. >> reporter: the topics, from homosexuality to rape to racism, were rarely seen on tv before. the central character, a politically incorrect working class bigot, archie bunker. >> i didn't have no million people out there marching and protesting to get me my job. >> no, his uncle got it for him. [laughter] >> reporter: what made you think bigotry could be funny? >> it wasn't the bigotry, per se. it was the state of the man's mind. he was afraid of tomorrow. he was afraid of anything new. >> reporter: "all in the family" was the number 1 show for five straight years. number 2 for much of that time was another lear hit, "sanford and son." it was 1 of 3 lear shows focusing on african american families. >> dyn-o-mite! ♪ ♪ >> reporter: and then there's "maude." >> i'm pregnant. >> reporter: at one point, lear had seven hit shows on television. did you plan to topple old taboos when you put these shows on the air? >> they weren't taboos to me. you could hear anything we were saying, you know, in the schoolyard. what was the big surprise? >> reporter: i think the big surprise was that you put it on tv. first one to do it. >> i fess up. [laughs] >> reporter: norman lear changed the face of television, and in the process, changed the way we saw ourselves. ♪ those were the days ♪ >> reporter: bill whitaker, cbs news, hollywood. >> norah: and we'll miss him. the u.s. coast guard recovered nearly $240 million worth of drugs. details next. ♪ ♪ ♪ ♪ ♪ ♪ ♪ you should check out inspire. no mask. no hose. just sleep. learn more and view important safety information at inspiresleep.com when you have chronic kidney disease... ...there are places you'd like to be. like here. and here. not so much here. farxiga reduces the risk of kidney failure which can lead to dialysis. ♪far-xi-ga♪ farxiga can cause serious side effects, including ketoacidosis that may be fatal, dehydration, urinary tract or genital yeast infections, and low blood sugar. a rare, life-threatening bacterial infection in the skin of the perineum could occur. stop taking farxiga and call your doctor right away if you have symptoms of this infection, an allergic reaction, or ketoacidosis. when you have chronic kidney disease, it's time to ask your doctor for farxiga. because there are places you want to be. if you can't afford your medication, astrazeneca may be able to help. ♪far-xi-ga♪ my frequent heartburn had me taking antacid after antacid all day long but with prilosec otc just one pill a day blocks heartburn for a full 24 hours. for one and done heartburn relief, prilosec otc. one pill a day, 24 hours, zero heartburn. - hi, i'm steve. - i'm lea. and we live in north pole, alaska. - as i got older, my hearing was not so good so i got hearing aids. my vision was not as good as it used to be, got a change in prescription. but the thing missing was my memory. i saw a prevagen commercial and i thought, "that makes sense." - i observed the changes in steve's memory and i thought i should try that too. - after taking prevage, i just didn't have to work so hard to remember things. prevagen. at stores everywhere without a prescription. >> norah: the coast guard today showed off the staggering amount of cocaine officials seized just last month in the pacific ocean. coast guard crews based in california and washington state, in six separate busts, hauled in more than 18,000 pounds of cocaine, with an estimated street value of nearly $240 million. there is an update tonight on recalled cinnamon applesauce. what parents need to know next. ♪ ♪ ♪ ♪ everybody here really, really make you feel like family and that they love you. our goal with tiktok was to enrich the lives of our residents and just to be able to show people what senior living can be like. i think i am a tiktok grandma. my kids think i am. i mean, we're the ones that are being entertained. time goes faster when you're having fun. your heart is the beat of life. if you have heart failure, entrust your heart to entresto. entresto helps improve your heart's ability to pump blood to the body. don't take entresto if pregnant; it can cause harm or death to an unborn baby. don't take entresto with an ace inhibitor or aliskiren, or if you've had angioedema with an ace or arb. the most serious side effects are angioedema, low blood pressure, kidney problems, or high blood potassium. ask your doctor if entresto is right for you. autoquote explorer from progressive shows you rates from other companies, even if they're lower than ours. because honesty is the best policy. i ate the apple pie you left cooling on the windowsill. that's my bad. who are you? 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