welcome to "world news tonight." we're following breaking news. an enforcement surge in undocumented immigrant arrests. targeted raids, rounding up hundreds of foreign nationals. is the new administration behind the latest crackdown? mounting setbacks. the president navigating rocky terrain from his battle in court over the travel ban, to possibly issuing a new, similar executive order. plus, his national security adviser under growing pressure tonight over conversations with the russian ambassador. dangerous ride. the school bus packed with students sent flying across the highway, flipping on its side. why the bus driver suddenly turned the wheel. torture chamber. the woman held hostage by a suspected serial killer, speaking out for the first time.

>> did he leave you bond? or did he unbind you? >> he left me bound and he also put a chain around my neck. and the new blizzard threat. where it's headed and the new technology that could save your life on those icy roads. tonight, we put it to the test. good evening. thanks for joining us on this saturday. i'm tom llamas. we begin tonight with the wave of undocumented immigrant arrests. targeted raids, carried out by u.s. immigration and custom enforcement officials. the flurry of new arrests raising new questions tonight. is it an uptick in volume due to the trump administration or just standard procedure? minnesota, marching in support of refugees and immigrants. abc's jim avila starts us off tonight. >> reporter: tonight, mounting arrests of undocumented immigrants fueling these protests.

calling it an enforcement surge. advocates fearing that donald trump promised deportation squads. is rounding up undocumented immigrants. >> we're going to have a deportation force. we have some bad hombres here and we're going to get them out. >> reporter: this week as president's unleashing federal agents from i.c.e., raiding homes across the country, hauling away immigrants from texas to atlanta. 161 deportations in los angeles alone. most had criminal records, but not all. according to an i.c.e. official, under president obama's policies at least five would not have been deported at all. >> we are all heartbroken and we still can't believe that this is happening. >> reporter: michaelle loeza's father, living without papers in oregon for 30 years, picked up this week. the family says i.c.e. was actually looking for his brother, who does have a criminal record. >> we need our dad. he's the man of the family. he's the leader. >> reporter: president trump's new homeland security secretary, general john kelly, went on two of the raids himself this week.

we spoke while touring border tunnels and the wall tunnels and the wall near san diego. >> are those the bad hombres that the president and you feel need to be returned to mexico? >> if they were picked up, they were subject to removal. the men and women of i.c.e. are simply going and executing the law, which is what our job is. >> reporter: while president obama was called the deporter in chief by immigration advocates for deporting more than 2 million undocumented immigrants in his eight years, i.c.e. then focused solely on criminals. as for the new man in charge, secretary kelly says his agents will only be bound by the laws on the books, not political policy. >> people like me and i.c.e. and other private citizens can't pick and choose the laws they are going to obey. >> reporter: a stern warning to all 11 million undocumented living in the united states -- most of them, law-abiding, working and paying taxes -- that they are no longer safe to stay here. tom.

>> jim avila on a story that's still developing. jim, thank you. now to the mounting setbacks faced by the new administration. the president tweeting this photo from the golf course with the prime minister of japan. last night speaking with reporters onboard air force one. hinting at a possible next step on that paused travel ban. the president indicating he wasn't aware of the growing fury report of his national security adviser michael flynn and those conversations that he had with the russian ambassador before the inauguration. abc's david wright with the latest. >> reporter: wary of getting stuck in the rough yet again, president trump played golf today his japanese counterpart. "having a great time hosting prime minister shinzo abe in the united states," he tweeted. apparently, his opinion has changed. >> japan. they're all taking our jobs, folks. >> reporter: out on the campaign trail, japan was one of his favorite punching bags. >> when these people walk in the room, they don't say, "oh, hello, how's the weather?" they say, "we want deal!"

>> reporter: these days, trump is all smiles. japan, one of several issues where campaign spin is giving way to a more measured presidential reality. trump also reassured china that he'll still abide by the "one china" policy, backing away from his provocative outreach to taiwan. he also hinted he'll file a new, more narrowly focused version of his targeted travel ban, one more likely to pass muster with the courts. >> could very well be, but i like to -- i like to surprise you. >> reporter: trump now faces the threat of a new crisis from his national security adviser, michael flynn, under fire for his december phone calls with a russian diplomat. at issue -- whether flynn told the russians not to worry about sanctions imposed by president obama in response to russian meddling in the election. flynn flatly denied the sanctions ever came up, then changed his story after intelligence confirmed that they did.

>> what report is that? i haven't seen that. i'll look into that. >> reporter: flynn now insists he "doesn't recall," but "can't be completely certain." >> and david wright joins us live now from mar-a-lago. we're learning tonight, dave, there are new questions about one of flynn's top aides. >> that's right. even as democrats in congress are calling for an investigation of flynn, abc news has learned that cia has denied a security clearance to one of flynn's top aides. that will effectively prevent him from serving. no comment tonight from the cia or the nsc. >> not a great week for the retired general. david, thanks so much. many americans expressing intensifying arrange in this period of natural transition. particularly on the heated subject on the future of health care. some fierce clashes between the people and the lawmakers elected to represent them.

abc's gloria riviera reports. >> reporter: emotions raw and tempers flaring in town halls. a packed hall in florida, filled with voters confronting gop officials. >> let's be all respectful. let's hold our boos and catcalls. >> reporter: this woman, a 77-year-old republican in a county that trump won, fed up. >> i left many, many messages at your office and i'm definitely one of your constituents. i'm 77 years old and i think it's unconsciencable that at 77 years old i will be facing -- >> reporter: a key concern -- the repeal of obamacare. some 20 million americans are currently covered. republicans are divided on the time frame and what happens next. similar scenes playing out across the country for weeks.

>> shame, shame. >> reporter: why do you think organizations like yours has started to spring up? what's behind it? >> because it works. we saw how effective the tea party was and we're employing similar tactics. >> reporter: after that town hall in florida the representative in that county tweeted his thanks to those who came saying, it's his duty to listen despite differences and he hopes to find common ground. tom. >> these town halls getting more and more heated. gloria, thank you. much more on the immigration controversy and that travel ban fight tomorrow on "this week," when george goes one-on-one with senior white house policy adviser stephen miller. next to the terrifying moments onboard a school bus, filled with high school students. that accident playing out on surveillance video. a van sending that bus barrelling across a highway. tipping it over. tonight, what that van driver's

accused of, details from abc's adrienne bankert. >> reporter: police tell a driver of the van allegedly under the influence pulled in front of the bus. the two vehicles collide. the bus toppling skidding hundreds of feet. five students rushed to the hospital. >> it all just happened really fast. >> it was like a nightmare that came true. thank the lord for helping me to survive through an accident like this. >> reporter: and in ohio, this newly released video captures students thrown from their seats as the bus crashes into an suv. they were all okay. in both crashes there were no seat belts. that's the case in most school buses in the u.s. seat belt manufacturers show three-point restraints can reduce injuries by up to 50%. look at the kids who aren't buckled in, they go flying. 17 states are considering seat belt bills this year. on average, six children die in school bus crashes each year.

that's out of the 23 million students riding. the federal government says even without seat belts school buses are safe. >> incredible everyone walked away from that accident. turning overseas to a deadly earthquake striking the philippines, when many people were sleeping. at least six people killed, many from falling debris. more than 200 people injured. back here at home tonight, new details emerging about a horrifying story. a woman held captive inside a chamber of horrors for months. by a suspected serial killer in south carolina. now, she's speaking out for the first time. abc's eva pilgrim with more on that tonight. >> reporter: tonight, the woman who escaped a suspected south carolina serial killer speaks out, sharing details of her captivity. >> he left me bound and he also put a chain around my neck. >> so in that container, you

chained into one corner, you couldn't move the length of the container? >> my neck was in one corner, my ankle was in the other corner. >> reporter: kayla brown telling her story, saying she saw her boyfriend shot and killed. and how she survived chained up like a dog, repeatedly assaulted, in an interview with dr. phil set to air monday and tuesday. brown missing for two months, was found in november inside this shipping container. detective whitfield hearing brown's calls for help. >> we were shocked and amazed when we heard the knocks back. >> reporter: brown trapped inside that container set on this property belonging to todd kohlhepp -- a seemingly successful local realtor. kohlhepp now facing charges for murdering seven people -- including brown's boyfriend, charlie carver. >> i was always there for him. i couldn't be there for him this time. >> reporter: brown telling dr phil, "he did not break me. i won." brown says kohlhepp hoped that

she would one day fall in love with him. kohlhepp is due back in court in march. tom. >> a hour riffic story, all right, eva, thank you. let's turn to weather. headaches across the country. this homeowner south of seattle, take a look, cleaning up after a mudslide. he considers himself lucky to still have a house. in the northeast digging out from the snow. senior meteorologist rob marciano joins us from new york's central park. he's tracking it all. rob, are we talking about a new blizzard threat here? >> we are, tom. we warmed a little bit from the last burst of snow. another explosive storm is heading to the northeast. look at the winter alerts, all the way down to d.c. we got some winter weather moving in. let's time it out. i think in the morning, we'll see some issues. with rain and sleet and some icing and then warming up just a little bit, rain across the coast, but this thing really winds up and bombs out by the time it gets to the gulf of maine. we're talking about blizzard conditions there.

d.c., could see gusts over 50 miles an hour. big-time accumulating snow, maybe 2 feet. in maine. tom? >> all right, rob, we'll keep all eyes on that storm. thanks so much. we want to stick with weather and talk about driving on those slick roads. there's new technology out there that may help save your life behind the wheel. here's abc's david kerley. >> reporter: this latest blast of winter is a slippery, sliding reminder of how dangerous driving on ice can be. >> it's pure ice underneath the snow. >> reporter: up to 80% of traction is lost on a slick surface. automakers are now adding technology to their cars to make it easier for you to get out of a skid like that. here at gm/chevrolet's test track, engineers try to get cars to slide. >> when i point the steering wheel, the electronics will actually say, oh, he wants to go this way. >> our controller has the ability to individually control each wheel. >> reporter: electronics stability control has been

mandated on new cars for more than five years now. a computer brain working faster than yours, slowing wheels that are losing traction, saving more than 1,500 lives in the last year studied. >> i was always taught to counter steer. if i start skidding to the left to steer to the right. it's changed now? >> yes. so the technology has enabled us to basically follow what the driver wants the car to do. >> reporter: and with the auto industry moving toward autonomous vehicles -- >> is there going to be a point where i don't even have to do anything? >> ultimately, the goal is to be able to predict what surface you're going to be on before you actually get there. >> reporter: and possibly taking control of your car to keep you out of a dangerous slide. david kerley, abc news, michigan. >> our thanks to david kerley for that report. there's still much more ahead on "world news tonight." we'll take you to the world's tallest dam overflowing and the emergency happening right now. plus, a doctor accused of telling patients they have

cancer when they don't. and 20 years ago, police officers carried freezing twin girls to safety. now, they meet for the first time since that day. the emotional reunion ahead. [phone ring] hello. hi, it's anne from edward jones. i'm glad i caught you. well i'm just leaving the office so for once i've got plenty of time. what's going on? so those financial regulations being talked about? they could affect your accounts, so let's get together and talk, and make sure everything's clear. thanks. yeah. that would be great. we've grown to over $900 billion in assets under care... by being proactive, not reactive. it's how edward jones makes sense of investing. how to brush his teeth. (woman vo) in march, my husband didn't recognize our grandson. (woman 2 vo) that's when moderate alzheimer's made me a caregiver. (avo) if their alzheimer's is getting worse,

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what nighttime pain? make all your pains a distant memory with advil the world's #1 choice what pain? advil. back now with a story of a doctor accused falsely diagnosing patients with cancer just to make money. abc's marci gonzalez has more. >> reporter: tonight, a settlement in the case of a florida doctor accused by a whistleblower of falsely diagnosing patients with cancer while pocketing million of dollars from insurance. >> i was devastated. i was devastated. >> reporter: dermatologist dr. gary marder diagnosed patients, including gloria strumolo, with skin cancer and treated her with hours of radiation therapy. but strumolo says after getting a second opinion from another dermatologist, dr. ted schiff, she learned the lesions marder treated were not cancerous.

>> i had no idea i did not need the radiation. i have no idea i did not need the surgery. >> reporter: dr. schiff says after seeing more of marder's patients with similar stories, he alerted authorities and started a whistleblower lawsuit. >> the whole, i guess scheme, was just to, we believe, you know, over-diagnose, falsely diagnose, you know, people with certain types of skin cancers. then use very expensive and very inappropriate ways of treating them. >> reporter: according to court documents, marder, who owns this $28 million oceanfront property, has now agreed to pay up to $18 million. to reimbursement the government for alleged medicare big. a member of his staff -- >> no comment. >> reporter: not commenting to a reporter from our west palm beach station. no comment tonight either from marder's attorney. marder was not criminally charged. tonight still has his license to practice medicine. tom. >> marci gonzales thank you so much. and when we come back -- texas just hosted the super bowl.

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finally tonight, a thank you 20 years in the making. the images are haunting. police officers running with not one, but two lifeless bodies. >> i saw the lights on, front door open, saw footprints. and it was too many prints to follow, it was scary. >> reporter: tom woracek's 3-year-old twins had wandered outside in the middle of the night, below zero temperatures, in half a foot of snow. omaha police officers raced to the scene. 45 minutes later, the girls were found in an alley, freezing.

>> your hands -- ice hands. >> reporter: that was 20 years ago. those twins, jennifer and kourtney, survived. and now, finally met the officers who saved their lives to thank them. >> i was over here and i walked across and started looking. >> reporter: the girls and their parents watched the video from that night, the officers walking them through the painful search. >> just seeing her, you know, pretty much dead you -- yeah, you look terrible. >> reporter: jennifer and kourtney still have some scars from that night, but they survived thanks to these officers. >> you can read things but seeing it, what they saw, what they did, they're heroes. >> reporter: and 20 years later, those officers are thankful they never gave up. and so are we. thanks so much for watching. good night.

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