features a picture of the new york parade is calling on its followers to use speeding vehicles to attack outdoor events. >> it is very difficult to detect large gathers like parades from these types of attacks using vehicle, and we saw that, for example, last summer in nice. >> reporter: authorities say 86 people were killed in the nice attack as a man claiming allegiance to isis drove a truck through the horrified crowds celebrating bas it's a situation authorities are well aware of. >> we've seen incidents where isil put out the call and people rise to the call. >> reporter: not the least because the parade route on thanksgiving day goes right past the big trump international hotel in new york city. preparations for the parade are well underway setting up the bleachers here in central park, and new york police have already visited some 135 truck rental

system for anyone planning attacks like the one in nice. brian ross, abc news, new york. two more suspected arsonists arrested in connection of the wildfires in the southeast. 80,000 acres scorched, and resulting smoke is causing breathing problems. outdoor activities like fireworks and campfires are ban in the danger zone. >> if you'd like to legally use pot without having a meal, head to colorado's capital,s first u.s. city to let restaurants and it allows customers to use the drug inside the establishment as long as it is not smoked. patrons must bring their own marijuana. baggage charges are now extending to overhead bins. united is the first major u.s. airline to limit customers to one carry-on bag that fits under the seat. if you need to use the overhead bin, you have to upgrade your seattle class or pay to check the bag. it begins in april. >> basically, you're allowed a

>> right. personal bag, they say, that's all you get. >> no carry-ones flying united economy there. speaking of travel, irish officials have a transatlantic mystery on their hands. the unusual looking solar power houseboat washed up on a beach with no one inside. it was apparently built in canada by adventurer rick small. last year, he rode a solar powered bicycle across canada. >> the summer, and inside was a note in which he gives the houseboat to a homeless youth. no word on rick's where abouts now either. >> a lot of mystery there. interesting. >> very cool. a rescue caught on camera, a deadly head-on collision, erupting into flames, what a man did to save one of the drivers trapped inside. kids and cell phones, how much should parents know about who their children call and text?

kids' cell phone use. we'll get into it. first, a look at today's high temperatures. "world news now" weather brought to you by united health care. approaching medicare eligibility? don't put off checking out your medicare options until 65. now is a good time to get the ball rolling. medicare only covers about eighty percent of part b medical costs. the rest is up to you. lans insured by unitedhealthcare insurance company come in. like all standardized medicare supplement insurance plans, they could help save you in out-of-pocket medical costs. taking informed steps really makes a difference later. that's what it means to go long?. call now and request this free decision guide and explore the range of aarp medicare supplement plans.

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it's judgment day. back seat chefs peer inside your oven. but you've cleaned all baked-on business from meals past with easy-off, so the only thing they see is that beautiful bird. go ahead. let 'em judge. in seattle, a downed power line caught fire after some rainy weather there. nearby roads repaired the damage. thankfully, no injuries reported. in california, a fire rescue caught on dash camera. the chp says a hyundai was trying to pass slower traffic and slammed head-on into a volkswagen. the two people in the hyundai killed, and the driver of the vw was alive, but trapped. flames all around the the only door the victim got out through

in to rescue the man. what a team effort there. investigators in utah are trying to piece together what happened after a 16-year-old straight-a student in provo, utah went on a stabbing spree in school wounding several classmates including himself. here's the latest. >> reporter: tears and ambulances at this suburban utah high school tuesday morning. the community responding to a terrifying stabbing spree breaking out just before a.m. >> i'm still with a patient who is stable on the south side of the school. i'm making access into the school for more critical parties. >> reporter: a 16-year-old male student, a sophomore, stabs five other students in the boys' locker room before using the knife to cut himself. >> transporting a patient from inside the locker room. two stab wounds to the neck. >> reporter: all five transported to the hospital with injuries fair to critical. a student resource officer taking the suspect in custody in

live streaming. >> school would normally be underway on a tuesday morning, and now it's just lined with fire vehicles. >> reporter: distraught parents waiting outside, this student shaken by school shootings elsewhere, and now a stabbing at her own. >> i find it scary because now i don't think schools are safe anymore. >> reporter: the school facing questions on how to prevent this from happening again. >> we hate the idea of having metal detectors and yet kids' safety is the most important priority. >> reporter: we've learned one victim and a suspect released from the hospital, and police say they don't know what the motive for the attack is yet, but have a number of witnesses and working to sort through the statements as they investigate. kendis, diane? >> lauren, thanks. grief counselors at the school later on this morning to help those students. >> much needed. >> yeah. shifting to lighter news now, a beautiful fir tree from wisconsin is on the way to the

for pictures before the 19 foot tree was taken down arriving at the white house the day before thanks giving. >> it rolls up there, and michelle obama and the young ladies welcome a tree. coming up, it's what so many kids are hoping to find under their christmas trees, a shiny new cell phone. >> before they power up, what parents need to know about monitoring their kids' cell phone use. now." "world news now" my favorite part about being a dad -- just to see their faces in the morning when i wake them up. the first thing you think about is your wife and your kids and your family. so i had surgery locally, and it came back after my follow up that i needed a second surgery. and that's when i said i need a second opinion. everyone, from the moment i walked through

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? ? oh, that messager app. reshould download that. >> what's instagram? >> never heard of it. trying to download the seven minute workout app. it's an interval workout. >> seven minutes? >> 12 exercises for 30 seconds,

>> a growing number of apps these days for parents to monitor, not the seven minute workout, but to control kids' cell phone use. >> it's a debate on whether and how much parents should supervise kids' cell phone events. here's t.j. holmes. >> reporter: what are teens doing on their phones? many adults will never know, but there's one who does. >> you can't hide from me. 13-year-old and 11-year-old was so anxious to know what her kids did on their phones, she secretly installed spyware to watch them, can see anything. >> it's legal to monitor your kids, but a controversy lurks. do teens deserve privacy or secretly monitoring for safety's sake more important? >> at 11 and 13, we have to know what's beginning on in their life. >> what's the problem with letting your parents see your phones when they ask? >> i just want privacy.

became more secretive. >> i immediately think something's going on. >> reporter: she downloads spy software on both kids' phones. were you torn? >> nope. >> you were not? >> not one bit. my kids, i needed to protect them. >> reporter: experts say it may hurt your children and relationship with them in the long run. the author of "how to raise an adult." >> 224/7 surveillance of your kids, everywhere about, every decision, every moment is effectively saying, i do not trust you in the slightest. >> reporter: how do you tell them you trust them when you spy on them? >> wow. i hope they just know that i do trust them, and that i'm doing this just to protect them. >> reporter: using the app, she discovers she's texting someone she thinks is a teenager, but when she calls the number, she gets a surprise, it's an adult. >> she thought she was talking to a friend, and turned out that it was not. >> reporter: she blocked the

>> went through every scenario, meeting somebody. >> reporter: she had to confront her daughter confessing about the spy ware, but she came clean first. >> she came down the stairs, like, i need to talk to you. >> reporter: beat you to it? >> she did. >> reporter: talking about the stranger she was texting, and shocked her mom was spying, she saw the other side. >> i had a lot of different emotions, like, why is she doing this, but i was happy because i knew she was >> yeah, see, you can spy on the kids, and eventually they come around. >> absolutely. >> even if they hate you in the moment. they'll get over it. >> reading the instructions for this seven-minute workout. >> you're into this seven-minute workout thing. >> it's really, like, deep here. >> a demonstration. >> jumping jacks description. start with feet together and arms at your sides, slightly bend your knees and jump

jacks d.c. kick your legs out to shoulder width and hands over

my cold medicines' wearing off. that stuff only lasts a few hours. or, take mucinex. one pill fights congestion for 12 hours. guess i won't be seeing you for a while. why take medicines that only last 4 hours, when just one mucinex lasts 12 hours? let's end this. happy anniversary dinner, darlin' can this much love be cleaned by a little bit of dawn ultra? oh yeah one bottle has the grease cleaning power of and grease is gone. it's judgment day. back seat chefs peer inside your oven. but you've cleaned all baked-on business from meals past with easy-off, so the only thing they see is that beautiful bird. go ahead.

might need this for the next segment. it's never easy to say good-bye to a four-legged family member, but a man across the pond had plenty of help. >> a surprise outpouring of kindnekind ness tops this morning's two truths and a why. >> grab a tissue for the first truth. he asked people to join him at the baemp for the last walk with his 18-year-old dog. he underestimated strangers. thousands joined mark and walnut pouring on to the beach in cornwall, u.k. this weekend to honor walnut's last walk hours

down. they tweeted messages of support, #walkwithwalnut, and he thanks everyone for coming out, reminding us how lucky we are to be alive to share in the wonderful world that our pets give us. fitting tribute there for walnut. next up, remember those word problems in your college math classes? well, for one college professor, those exercises of probability just became a lot more autobigraphical. this is a at fairfield university in connecticut who just happened to win the lottery taking home a $100,000 jackpot. he said he ignored the advice of his teacher who said the odds were too small to win the lot toe, and he's an example and probability lextures saying someone has to win, so why not you? timely, why is this suddenly the most popular bird in all of china?

the new president-elect here in the u.s. yep. folks are flocking to the enclosure in china to look at the donald trump look-alike. the bird's name is little red and the species is indigenous to central china. what came first the chicken or the egg, but one user wants to know, so does the bird look like trump or does trump look like the bird? what do you think? >> oh, we're still over walnut. >> kendis, you okay? >> i don't know. poor walnut. >> you're going through it now. >> it's sad. that's beautiful. the neighbors came out. that was awesome.

>> this morning on "world news now" civics and ethics for the future first family. >> criticism over his children, the trump brand, and the white house. the growing concern over the president-elect's relationship with the press. >> t halted air traffic, and travel everies facing delays and cancellation told to huddle in place, and others escorted by the police in swat gear. new details. >> what megyn kelly is saying about the feud with then candidate donald trump and what she thinks about the choices of the white house team opinion. grub on the go, the biggest exports, talking about fast food, of course, on this national fast food day.