escalation in the protests at columbia. pro-palestinian demonstrators smashing their way into a hall on campus, barricading themselves inside. will new york city authorities take action? what we're learning right now. the four officers shot and killed and the new images tonight of that charlotte neighborhood, and the terrifying scene. officers firing from behind a vehicle. the suspect armed with an assault rifle, firing from multiple locations. the officers shot, including two 14-year veterans, two dads, one who had just been named officer of the month. tonight, the judge fining donald trump for contempt of court, warning trump he could be put in jail if he continues. tonight, those new tornado watches across several states. severe storms, and they could hit some of the very same places hit with those deadly tornadoes already. ginger zee is here. the images coming in. an suv crashing through a store. at least one dead, more than a dozen customers and employees hurt. the race for the white house tonight. donald trump's new comments on abortion. saying some states might choose to monitor women's pregnancies to possibly prosecute women who violate abortion bans. tonight, president biden now responding. breaking news tonight, just in, a commuter train has collided with a bus in los angeles. there are reports of dozens of injuries. what we're learning. federal authorities and the new warning tonight, the nation horrified by that video, the homeowner with a gun, the uber driver who was killed. tonight, this warning about a growing number of scams targeting seniors, and we'll tell you how it works. the horrifying scene in arizona. a 2-year-old boy killed when a gust of wind carries away a bounce house. tonight, women and breast cancer, and the major change this evening in federal guidelines for screenings. and the hero barbers. you will see the video tonight. what they saw outside their shop, and why they dropped everything to save a child. america strong. >> announcer: from abc news world headquarters in new york, this is "world news tonight" with david muir. >> dave: good evening, and we begin tonight with the breaking news here in new york city. the city's mayor speaking just moments ago, amid these growing pro-palestinian protests across the country, a movement that started at columbia university here in new york. now, overnight all of this escalating. look at these images, when a group smashed through windows and broke into the historic hamilton hall at columbia. zip-tying the doors shut and occupying the building tonight. the mayor speaking moments ago, saying there are outside agitators among the demonstrators, and nypd officials saying just a short time ago that they are essentially ready to move in if asked. let's get right to abc's stephanie ramos, live at columbia with late reporting for us. stephanie? >> reporter: david, the new york city mayor and nypd officers holding that press conference just a few moments ago to discuss the situation here at columbia university. the new york city mayor saying outside actors have co-opted the protests here on campus. the mayor also asking parents of students here to call them, tell their students to leave the campus immediately before the situation escalates. late today the mayor of new york city urging every student and demonstrator to walk away now for their own safety, saying the protest has been taken over by professional outside agitators. >> it is our belief they are now actively co-opting what should be a peaceful gathering. >> reporter: this is the moment protesters smashed through the doors of a columbia university building overnight, taking their demonstrations to a new level. protesters zip-tying doors shut and barricading themselves inside. renaming the building with a new flag, in honor of a 6-year-old palestinian girl killed in the war in gaza. >> the reclamation of the hall in the name of palestine, in the name of gaza, shows how committed students are to their solidarity with gazans. >> reporter: tonight, columbia university saying protesters have chosen to escalate to an untenable situation, vandalizing property, breaking doors and windows, and blockading entrances. the school warning of consequences, but for now not calling in the niepd. >> i feel like the leadership hasn't taken action. they've kind of let them get away with a lot of stuff and it's about time we get some action. >> reporter: college demonstrations now reaching every corner of this country. calling for schools to divest from ties to israel. after dozens of arrests at unc, protesters taking down an american flag and replacing it with a palestinian flag until school officials restored it. in california police moving in to arrest 25 protesters at cal poly humboldt on charges like vandalism and assault after students took over a campus building for a week. at virginia commonwealth university, police using pepper spray after the school said officers were targeted with objects and chemicals. protesters seen flushing their eyes with water. back at columbia, new york's mayor warning that police are prepared to take action. >> we cannot wait till this situation becomes even more serious. this must end now. >> reporter: new york city's mayor eric adams saying the protests here at columbia university should have remained peaceful. he is urging student demonstrators tonight to leave this area immediately. david? >> dave: stephanie ramos, who will continue to report on this to the end of the night. stephanie, thank you, again. this evening we turn to the new and terrifying images tonight after four officers, one of them a u.s. marshal, were shot and killed. the deadliest day for american law enforcement in years. officers serving a warrant at a home in charlotte, north carolina. this new video tonight shows that neighborhood, what many said looked like a war zone. officers taking shelter behind a vehicle, exchanging gunfire with a heavily armed suspect next door. other officers approaching through neighboring yards. an armored vehicle driving on lawns, taking one of the wounded officers to try to get them help. tonight here, the faces of the fallen officers. officers sam poloche and william alden elliott, 14-year veterans of the department of adult corrections. thomas weeks, a u.s. marshal, who leaves behind a wife and four children. joshua eyer, an army veteran and father of a 3-year-old, just last week honored as officer of the month. faith abubey is in charlotte for us tonight. >> reporter: tonight, the dramatic new video showing the suburban charlotte neighborhood turned into a war zone. a tense standoff with a convicted felon that left four officers, including a u.s. marshal, dead and four others wounded. the officers seen taking cover behind vehicles as they exchanged a barrage of gunfire with the heavily armed suspect. officials say around 1:30 monday afternoon members of a u.s. marshal fugitive task force went to arrest terry clark hughes jr. for felony possession of a firearm. police say the suspect saw them coming and targeted them as they approached this house. >> he was shooting from upstairs down at the officers, both front and back. gunshots were coming from multiple locations within the house. >> reporter: the suspect armed with an assault-style rifle, a handgun, and extra ammunition. >> tyler, get in here! >> get in the bathroom, tyler. >> reporter: this man lives next door and was just feet away. and the bullets were flying? >> flying, right here. >> reporter: the violent shootout lasting four hours. the suspect shot dead on his front lawn. at an emotional press conference today, officials clearly grieving, remembering the officers' heroic acts in the line of duty. >> it's just been very tough, and knowing that you have families that are hurting right now. we'll get through it, though. >> reporter: investigators now identifying all four law enforcement officers who died in the violent attack. officers sam poloche and william alden elliot, 14-year veterans of the department of adult correction. thomas weeks, a u.s. marshal, who leaves behind a wife and four children. and joshua eyer, an army veteran and father of a 3-year-old, who just last week was honored as officer of the month. and david, tonight only one of the four injured officers remains in the hospital. the police chief tells us he is stable. david? >> david: we're thinking about all of those families tonight. faith abubey. faith, thank you. tonight, donald trump and the judge at trump's criminal trial here in new york holding trump in contempt of court and fining him. and warning trump that he could be put in jail if he continues. here's aaron katersky. >> reporter: tonight, the judge in donald trump's criminal trial holding the former president in contempt of court for his relentless public attacks on witnesses and potential jurors. judge juan merchan ruling trump violated the gag ordinary nine times, slapping him with a $9,000 fine, the most allowable, and a warning, if trump keeps it up it may be "necessary and appropriate" to throw him in jail. the ruling coming on day nine of the trial. trump repeatedly complaining how cold it is in court. >> i'm going to sit in a freezing cold ice box for eight hours, nine hours or so. they took me off the campaign trail. >> reporter: for the first time, a member of trump's family accompanying him to court. his son eric, who sat behind his father. prosecutors today laying out the hush money payment at the heart of the case, showing the jury how trump's former fixer michael cohen arranged to pay porn star stormy daniels for her story of an alleged affair with trump to keep it from voters before the 2016 election. prosecutors called daniels' former lawyer keith davidson, who helped broker the deal. he testified daniels' story had been floating around the internet for years, but trump's team made no effort to buy it until the final weeks of the 2016 campaign, after the "access hollywood" tape became public, trump heard boasting about groping women. >> when you're a star they let you do it. you can do anything. >> reporter: before the "access hollywood" tape, davidson testified, there was very little if any interest. but after, "that interest reached a crescendo." davidson found himself negotiating directly with michael cohen. the two men struck a deal. daniels would get $130,000 for her story. but davidson testified, "it was my understanding that mr. trump was the beneficiary of this contract." but the payment kept getting delayed. davidson said cohen told him, “what do you expect me to do? my guy is in five states a day. i'm doing everything i can." davidson was convinced, though, they were "trying to kick the can down the road until after the election." ultimately cohen told him, "goddamnit, i'll just do it myself." and paid the porn star out of his own pocket. prosecutors say when trump later reimbursed cohen he illegally falsified documents to make it all look like a legal expense. trump today almost egging on the judge who had held him in contempt, david, calling him rigged, crooked and conflicted. but the judge made clear if these violations of the gag order continue he's not above throwing trump in jail. david? >> david: aaron katersky again tonight. thanks, aaron. we're tracking severe weather. the storms across several states tonight. new tornado watches, damaging winds, hail, all possible, and this could target some of the very same areas hit with tornadoes over the weekend. chief meteorologist ginger zee is tracking it all for us tonight. ginger? >> reporter: david, there are four states tonight with tornado watches, meaning the atmosphere is primed for rotation. so we'll go with those until 11:00 p.m. missouri, down to kansas, we'll see it the latest, wichita is included, by the way. and then tomorrow, it's all about the giant hail. dodge city, kansas, woodward, oklahoma, but from kearney, nebraska down to abilene, texas you'll have to look for damaging wind and an isolated tornado. speaking of, we've had a lot of tornadoes this month. second-most on record for the month of april, david. >> david: ginger, we'll see you first thing in the morning on "gma," thank you. now, to the race for the white house, and tonight, donald trump's new comments on abortion, saying that some states might choose to monitor women's pregnancies to possibly prosecute women who violate abortion bans. tonight, president biden responding, and here's mary bruce. >> reporter: tonight, donald trump says he won't stand in the way if states want to monitor pregnant women to make sure they comply with abortion bans. and he won't step in to prevent states from prosecuting women who violate those bans by ending their pregnancies. in an interview with "time" magazine, trump was asked -- do you think states should monitor women's pregnancies so they can know if they've gotten an abortion after the ban? trump saying, "i think they might do that. again, you'll have to speak to the individual states." trump then asked if he'd be comfortable if states prosecute women who get abortions. his response, "it's irrelevant whether i'm comfortable or not. it's totally irrelevant, because the states are going to make those decisions." in the 2016 campaign trump said women who have abortions should be punished. >> do you believe in punishment for abortion? yes or no, as a principle? >> the answer is that there has to be some form of punishment. >> for the woman? >> yeah. there has to be some form. >> reporter: he quickly backtracked. as president, he appointed three of the justices who overturned roe versus wade, something he continues to brag about. >> we broke roe v. wade, and we did something that nobody thought was possible. we gave it back to the states. and the states are working very brilliantly. >> reporter: president biden calling trump's comments today "reprehensible." saying, "donald trump doesn't trust women. i do." both biden and trump well aware abortion could be on the ballot in 13 states this november, including critical battlegrounds like pennsylvania, nevada, arizona, and florida. and that every time abortion has been on the ballot since roe was overturned, even in red states, abortion rights have won. the biden team is trying to seize on this issue, with the vice president taking on a stepped up role. she will be down in florida tomorrow, as the state's six-week abortion ban goes into effect. now, trump has said that ban is too severe, but he still won't say how he will vote on the issue when it's on the ballot in november. david? >> david: mary bruce live at the white house for us. mary, thank you. we are learning more tonight after some terrifying moments, an suv crashing into a thrift store in las cruces, new mexico. authorities say the suv crashed right through the glass doors, killing one person and injuring more than a dozen others, including customers and employees. police say the 69-year-old driver was pulling into a parking space when she mistakenly pressed on the accelerator instead of the brake. tonight, there is a new warning from federal authorities about scams targeting seniors across this country. it comes after the nation was horrified by the images of that homeowner with a gun, and that unsuspecting 61-year-old uber driver who was killed. tonight here, the scam warning and how it works. here's pierre thomas. >> reporter: tonight, that harrowing video seen by the nation. the senior with the gun charged with murdering the unsuspecting uber driver. >> help! help! >> reporter: the result of what authorities say is an explosion of scams targeting senior citizens. this one with deadly consequences. now the fbi warning just how pervasive scams against senior citizens have become. victims losing $3.4 billion in 2023. up from $3.1 billion in 2022. and just today, the doj charging 16 suspects in the dominican republic and the u.s. with a so-called grandparent scam, stealing millions of dollars in a multinational scheme. here's how it worked -- the scammer would call the senior citizen, claiming thousands of dollars were needed for a loved one who had been in a car accident involving a pregnant woman. the person would panic, agreeing to pay the money. a courier would then show up at the person's home and collect the money. or the victim was instructed to mail the cash. >> they're susceptible. they're not as familiar with technology as younger people, and therefore, they're most likely to be impacted by this type of fraud. >> reporter: tonight, the fbi is encouraging financial institutions to do more to protect senior citizens if they notice their accounts being drained, david. >> david: pierre thomas, i know you'll stay on this for us. pierre, thank you. tonight, an historic shift for the justice department, moving to reclassify marijuana as a less dangerous drug. the dea is proposing to allow the medical use of cannabis, acknowledging it does less harm than other drugs like heroin and ecstasy. but the proposal would still not legalize it for recreational use, although many states have already done so. the federal regulatory review will likely take months. when we come back on this very busy news night, we do have breaking news. a commuter train, we have just learned, colliding with a bus in los angeles. the images. reports of dozens of injuries. also, major changes tonight to the guidelines for breast cancer screenings, in a moment. ♪ stay ahead of your child's moderate—to—severe eczema, and they can show off clearer skin and less itch with dupixent. the number one prescribed biologic by dermatologists and allergists, that helps heal your child's skin from within. serious allergic reactions can occur that can be severe. tell your doctor about new or worsening eye problems such as eye pain or vision changes, including blurred vision, joint aches and pain, or a parasitic infection. don't change or stop 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accidents every year. the new federal guidelines tonight for screening for breast cancer. the u.s. preventative services task force now suggesting women at average risk for breast cancer should start getting mammograms now at 40, suggesting they be screened every other year. when we come back here tonight, you have to see this. the hero barbers who dropped everything, left their customers right there in their chairs, when they saw something outside their window. for people who feel limited by the unpredictability of generalized myasthenia gravis and who are anti-achr antibody positive, season to season, ultomiris is continuous symptom control, with improvement in activities of daily living. it is reduced muscle weakness. and ultomiris is the only long-acting gmg treatment with the freedom of just 6 to 7 infusions per year, for a predictable routine i can count on. ultomiris can lower your immune system's ability to fight infections, increasing your chance of serious meningococcal 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an encampment keeps getting bigger. we're following the story. >> smoke rising from the bay bridge. how long it took to clear this car fire that backed up traffic and a live report on what's causing a sea lion surge. >> look at all of these things at san francisco's pier 39. >> always live. abc seven news starts right now. >> across the country and right here in the bay area, protesters at colleges and universities are taking a stand, and there's not much of the school year left. good evening. i'm ama daetz and i'm dan ashley. >> thanks for joining us. stanford, cal, usc, ucla. they're all dealing with protests connected to the war in gaza. pro-palestinian activists are making demands and at some schools camping out at cal, the free palestine encampment continues to grow. >> abc seven news reporter leslie brinkley has the very latest on what stance the university is taking. as one jewish student says, she is fearful. >> last week there were 50 tents on the steps of sproul plaza at uc berkeley. yesterday it was up to 150. today, 175 tents are pitched at sproul, a camp which now extends onto the lawns on the sides of the building. walking through sather gate is now unimpeded. overall, the ucs have taken a firm stance opposing calls for a boycott against israel based academic programs or divestment from firms doing business with israel. at uc berkeley, a small area of graffiti materialized at