the new details about when the temporary cease-fire between israel and hamas will begin, and what we are learning tonight about the hostages expected to be released. >> going nowhere fast. heading home for the holidays means a sea of brake lights on interstate 95. it's slow going in delaware. we've hit 5 miles an hour. >> i am here at a dog park in new york city where some owners are expressing concern about a mysterious illness affecting dogs in several states. what to watch out for with your dog. >> just like this is flu season for people, this is flu season for dogs, as well. ♪ ♪ >> it is truly addictive. >> jericka: and we are serving up some tips on the sport that is sweeping the nation. how to perfect and protect your pickleball game. >> you've just got to give your body time to heal and rest. ♪ ♪ >> jericka: good evening to our viewers in the west, and thank you for joining us on this wednesday night. i'm jericka duncan in for norah. we begin tonight with a deadly car explosion at one of the busiest u.s. border crossings with canada, prompting the initial launch of an investigation into a possible terrorist attack. the vehicle sped near the rainbow bridge in niagara falls and flew into the air before exploding into a ball of flames and thick black smoke at a secondary checkpoint. new york's governor confirmed late this afternoon there is no indication this was a terror attack. authorities say the two people in the car died. the white house released a statement saying president biden has been briefed. now a recent national terrorism assessment reviewed by cbs news shows a "heightened threat environment" in the u.s. due to the israel-hamas war. cbs's catherine herridge starts us off tonight with the late-breaking details. good evening, catherine. >> reporter: jericka, the investigation is ongoing. the crash triggered a massive response and briefings at the highest level of the u.s. and canadian governments. tonight, there is growing evidence it may have been an accident. this dramatic video shows the vehicle speeding along the roadway near the border station and launching into the air before landing and exploding on the u.s. side of the border. >> there was a car in front of him. he swerved around it. >> reporter: eyewitness mike gunther. >> all of a sudden he went up in the air, and then it was a ball of fire like 30-40 feet high. i've never seen anything like it. it was really incredible. >> reporter: a preliminary federal law enforcement assessment obtained by cbs news provides more detail. it says the car was traveling at a high rate of speed when it hit a curve or embankment, then crashed through a fence and landed in a secondary inspection area, then catching fire and exploding. in a rare move, authorities shut down four bridges in western new york state connecting the u.s. and canada. as the fbi's joint terrorism task force launched an investigation, with scenarios ranging from an accident to a potential ramming attack or car bomb. canada's prime minister justin trudeau addressed parliament before a briefing with u.s. officials. >> we are taking this extraordinarily seriously, and, mr. speaker, i will have to excuse myself now to go get further updates and work on this very serious situation. >> reporter: the rapid law enforcement response reflects both the holiday weekend and recent warnings. on wednesday, a joint intelligence assessment reviewed by cbs news said the israel-hamas conflict has created a heigtened threat environment, with the intelligence community concerned about lone actors and unsophisticated attacks. late today, new york's governor gave a preliminary update, that there is no evidence of terrorism. >> all i know is there was a horrific incident. a crash, an explosion, loss of life. but, at this time, no known terrorist connection. >> reporter: the fbi is digging into the driver's background to understand what led to the crash. meantime, homeland security confirms to cbs news, three of the bridges have reopened, jericka. >> jericka: catherine herridge tonight, thank you. turning overseas now to the breakthrough deal between israel and hamas for the long-awaited release of hostages. we are learning tonight that no hostage will be freed until at least friday. that's when hamas is expected to begin releasing 50 women and children in exchange for 150 palestinian women and teenagers being held by israel. cbs's holly williams reports that the temporary four-day cease-fire has also been pushed back. >> reporter: tonight, israel's prime minister benjamin netanyahu vowed to bring home all of the hostages, calling it a sacred mission. under the deal, hamas is incentivized to release more of its captives. every ten extra hostages freed will extend the temporary cease-fire by a day. [indistinct shouting] in gaza, some residents told cbs news a four-day pause in fighting isn't enough. "we are exhausted," said this girl, "we want a permanent truce." "we want peace," said this young man, "we have had enough." in israel, the families of the hostages have endured anxiety and heartbreak for more than six weeks. but with hope on the horizon, today, a group of their supporters sang songs of peace in central tel aviv. >> my life is ending the moment my family was broken. >> reporter: hadas calderon's 16-year-old daughter sahar and 12-year-old son erez were taken hostage from kibbutz nir oz. this video shows hamas militants attacking the small farming community and taking erez when they left. what do you think sahar and erez have been going through since they were taken -- >> hell. hell, that is what they are going through. i just want them to come back and to heal them. >> reporter: gershon baskin is an israeli hostage negotiator who helped secure the release of an israeli soldier captured by hamas, gilad shalit, in 2011. in return for over 1,000 palestinian prisoners. this time, hamas is getting just three prisoners in exchange for each hostage. what does that tell you? >> hamas wants to get rid of the women, the children, the elderly. they are a burden on them. once they have the soldiers and only the soldiers, they will then begin demanding what they really want, which is the release of all the palestinian prisoners in israel. >> reporter: israel's military said tonight that the hostage release procedure has not yet been finalized. but one detail we do have is that the red cross will be able to visit those hostages who are not released and take them medicine. jericka? >> jericka: yeah, conflict still with a lot of moving pieces. holly williams in tel aviv, thank you. back here at home, today is traditionally the busiest travel day on the roadways right before the thanksgiving holiday. aaa says more than 49 million of you are expected to drive to your destinations this week. here is cbs's kris van cleave. >> reporter: tonight, the driver of this box truck truly has something to be thankful for, rescued after the truck flipped on its side, hanging from a houston overpass this morning, just as millions of americans are heading home for the holidays. nearly doubling drive times in some major cities. drivers hit snow in boston. >> this is a lot. we should have left earlier because we have, i think, like five hours left to go. >> reporter: this morning, treacherous wet roads around new york led to crashes like this one in connecticut. in nashville, traffic was crawling. drivers on interstate 5 north of los angeles hit major delays when a semi spilled dozens of 15-foot metal pipes. the last minute, not-so-fast thanksgiving rush, is on. >> got an early start this morning. it hasn't been too bad yet. >> reporter: today will also be amtrak's busiest day leading up to thanksgiving. >> train travel is more convenient. prices were better than the flight. >> reporter: and airports saw long lines on what is expected to be the second-busiest day to fly of the holiday period. in phoenix, the o'donnells were eager to get on their flight to vancouver, joining more than 15.3 million other flyers since thursday. >> he is nervous about security so -- >> get through security, and we will be good. >> heading to that next. >> reporter: we met the ballow family at a restaurant in delaware, giving 5-year-old cole and 2-year-old maddox a break, after a nearly three-hour drive from long island, with hours more to go. >> we are excited to see family. we had a covid baby, so no one got to meet him, so we are finally going to travel to bethesda, maryland, and see family. >> reporter: our drive started early this morning in connecticut. it was noticeably slower going down to washington, d.c., than the last couple of years. as for the return, expect a very heavy traffic starting midday sunday, jericka. >> jericka: all right, looks like traffic is moving at a pretty good clip. kris van cleave, thank you. tonight, the thanksgiving forecast is looking brighter for most of the country. however, those of you in the rockies could experience some heavy snow in the days ahead. let's turn to chris warren from our partners at the weather channel with more at what to expect. good evening, chris. >> good evening, jericka. people lining the streets of new york tomorrow morning need to bundle up, especially if you are not in the sunshine. in the shadow of some of these tall buildings, with temperatures in the 40s, balloons shouldn't have a problem with the winds generally about 5-10 miles an hour. watching another storm system moving into the intermountain west, by the end of the week, thursday, and friday, so tomorrow into friday, the first part of saturday, a lot of snow is going to fall in the mountains. could have some travel issues on some of the big interstates in wyoming. that system then moves east, and by sunday, for going home, travel could have some issues in terms of snow around the great lakes, and jericka, it looks like straight rain in the south. >> jericka: oh, man, thank you, chris. holiday shopping officially kicks into high gear this week while black friday sales are around the corner. recent incidents of shoplifting and organized retail crimes have some reconsidering their shopping plans. cbs's carter evans reports on what some cities and businesses are doing to keep everyone safe. >> reporter: a flash mob of 17 masked thieves pushing past holiday shoppers to rob a nike store this week near los angeles is exactly the kind of crime cities across the country are trying to crack down on. >> to all you shoppers out there, especially you visitors in san francisco, i want you to make it rain. >> reporter: after a series of thefts scared away shoppers and shutdown stores, san francisco launched a safe shopping initiative, beefing up patrols to ease jitters. same goes for miami-dade's dolphin mall, where canines and extra officers will be more visible. >> you're going to be probably the safest you could be anywhere, anyplace in the world. >> reporter: it all comes as a gallup poll shows more americans fear becoming victims of crime. a near record 40% say they are afraid to walk alone at night within a mile of their home. 50% fear getting their car stolen. and 17% avoid going to the mall. >> getting ready to breach. >> reporter: we were there monday as authorities carried out this raid in l.a., arresting shoppers allegedly involved in an organized shoplifting ring. even in beverly hills, officials say they are determined to keep shoppers safe. >> i hear the drone. there it is above the palm tree. >> oh, yeah, hawkeye. >> reporter: police drones are in the air 14 hours a day after this brazen attack on a jewelry store last year. officers are also monitoring 2500 security cameras. >> we have created this real-time watch center where all of the city cameras can be watched in a single place. >> reporter: is it working? is it bringing crime down? >> it is. >> reporter: is it making people feel safer? >> i think so. >> if we don't do something soon for our stores, they are going to be out of business. >> reporter: aaron jones provides armed guards to businesses. he says the number of requests has tripled since 2020. >> they realized that they had to do something to protect people. >> reporter: now, in addition to hiring extra security, some retailers are experimenting with new store layouts to deter shoplifters. it's estimated that u.s. retailers lost $112 billion to retail theft last year, and that is a record. jericka? >> jericka: sounds like it. carter evans in beverly hills, thank you. we turn now to a serious respiratory illness that does not respond to antibiotics and has sickened hundreds of dogs in multiple states. cbs's elaine quijano tells us what dog owners need to know. >> reporter: tonight, veterinarians have a warning for dog owners: don't take your pet to a place where there is a hig% concentration of dogs. >> you're trying to avoid high-risk situations. >> reporter: researchers aren't sure what is causing the mysterious illness, but say the canines all had one thing in common: they had spent time around other dogs, like at a boarding facility, day care, dog park, or groomer. >> be concerned that if you're putting your dog in a situation, a kennel situation with other dogs, which you don't know, then you are increasing your risk of exposure. >> reporter: there are suspected cases in at least 12 states. symptoms include coughing, discharge from the eyes or nose, lack of appetite, and lethargy, and can last for six weeks or more. some dogs develop pneumonia. it is a concern for kaitlyn doyle, who will be traveling to denver with her dog, darling, for the holidays. >> we are not going to the dog parks there. she just can't be interacting with dogs right now. i know it's extreme, but... this is my baby! >> reporter: the american veterinary medical association says the risk of humans getting sick is low. they suggest people wash their hands after coming into contact with dogs and to consult a veterinarian immediately if their dog is experiencing systems. >> all anyone can do is really just -- [barking] keep the interaction to the minimum until more information comes out. >> reporter: vets here at ur vet care are concerned there could be more cases, as people board their dogs for the holidays. they recommend making sure your pet is up-to-date on its vaccines, especially for respiratory diseases. jericka? >> jericka: definitely something to keep an eye out for. elaine quijano, thank you. the death toll rises after a landslide wipes out homes in alaska. the desperate search for survivors next. survivors next. >> jericka: search and rescue the desperate search for survivors next. it naturally begins to change, older, causing a lack of sharpness, or even trouble with recall. thankfully, the breakthrough in prevagen helps your brain and actually improves memory. the secret is an ingredient originally discovered... in jellyfish. in clinical trials, prevagen has been shown to 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