welcome welcome to "world news tonight." we're following a mass casualty event on an american highway. the tour bus ramming into a semi truck. at least 13 killed, do the highway shut down for hours. investigators now on the scene. fight to the finish. donald trump, losing ground in the polls. now, his own campaign staff acknowledging he's falling behind. all-out assault. the new offensive against isis,. backed by u.s.-led air strikes. the fight to liberate the terror group's biggest stronghold in

>> shots fired! >> a police officer taking a civilian on a ridealong when a traffic stop erupts in gunfire. tonight, the manhunt under way, as we take you inside that cruiser. and, reverse the curse. the chicago cubs making their first trip to the world series since 1945. now, hoping to finally shake the curse of the goat. good eve good evening. sunday. i'm tom llamas. we begin with the highway horror, the deadly collision in southern california. a tour bus crashing into a big rig. at least 13 killed, dozens hurt. the bus crashing on interstate 10. in desert hot springs. the freeway shut down for hours. tonight, we're learning more about the tour company and that driver. here's adrienne bankert.

determine the cause of this massacre on a southern california highway. >> in almost 35 years, i've never been to a crash with 13 confirmed fatal accidents. it's tough for all of us. >> reporter: just before dawn, a tour bus slamming into the rear of a semi truck. emergency crews racing to the rescue. pulling over 30 injured out, some in critical condition. survivors tellin asleep at the moment of impact. officials saying most of the 13 killed were sitting near the front of the bus. >> the bus was traveling significantly faster than the truck. >> reporter: the force of the collision so severe, the bus careened 15 feet into the bed of the truck. this is all that's left of the semi behind us. from witness accounts, it appears the big rig swallowed that bus. officials saying there were no signs the driver hit the brakes.

as crews work to identify victims and clean up the crash scene. the bus driver among the dead. tom, the scene is still so chaotic here. with such a large number of injured and dead. i spoke with a couple of family members who say they're waiting to find out if their mother and grandmother survived. tom? >> thank you. and now, to a fight to the finish between donald trump and hillary clinton. trump's team acknowledging he's behind in the polls. and take a look at the numbers of our new abc news poll. clinton, 50%, trump, 38%. a wider margin than other recent polls, but m polls, but most now showing clinton establishing a solid lead. trump in a race against time, with election day a little more than two weeks away. here's david wright. >> reporter: as he starts a swing through the must-win state of florida, donald trump is trying to look forward. but his own campaign manager acknowledged it won't be easy to close the gap.

million in ad buys. >> reporter: >> reporter: polls show 65% of voters disapprove of him saying he may not accept a clinton victory as legitimate. and trump outlined his vision for the first 100 days of trump america. >> it's a contract between donald j. trump and the american voter. >> reporter: but he's mired in battle. threatening revenge on the women accusing him of sexual misconduct. >> all of these liars will be sued after the election is over. >> reporter: his opponent not letting up. >> he can go to gettysburg and sue women who made accusations against him. i'm going to keep talking about what we want to do. >> reporter: and new women coming forward.ing

adult film star who claims trump kissed her a decade ago. abc news unable to confirm his story. >> it's become very clear that you're probably going to lose. >> correct. [ laughter ] >> reporter: "snl" mocked trump's claim the election is rigged. >> all of the newscasters are making me look so bad. >> and how are we doing that. >> by taking all of the things i say and do, and putting them on tv. [ laughter ] >> reporter: democratic vice presidential nominee tim kaine is calling trump a sore loser, but that's obviously premature. trump has an aggressive campaign schedule. fighting hard in the battleground states all week long. tom? >> 16 days to go. thank you. hillary clinton making her big move, focusing not just on battleground states.

stro strongholds. mary bruce on the campaign trail. >> reporter: in north carolina today, hillary clinton taking her closing argument to church. >> anger is not a plan. >> reporter: with the momentum on her side, clinton is looking ahead. >> we've got to actually start interacting again with people we don't agree with. i do that all the time. [ laughter ] >> reporter: as she cris-crosses the battleground states, clinton is hammering home what she says is at stake in the election. >> my opponent thinks insulting women makes him bigger. that may be clear who donald trump is, but this election is about who we are and what we believe. >> reporter: and she's also reaching out directly to trump supporters, as she faces the possibility of trying to unite a bitterly divided country. >> i understand they need a president who cares about them,

and i want to be their president, too. [ cheers and applause ] >> reporter: clinton says she's looking past her opponent. >> i debated him for 4 1/2 hours. i don't even think about responding to him anymore. >> reporter: instead, she's focused on the battle for congress, lending her support to democratic candidates. and going after their republican opponents. today, weighing in on the north carolina senate race. >> unlike her opponent, debra has never been afraid to stand up to donald trump. >> reporter: clinton using republican candidates' ties to trump in the downballot races. democrats are hopeful they can regain the senate. some thinking trump's controversies could help democrats take back the house. tom? >> mary, thank you. now let's get right to jonathan karl. the headline of the poll, showing a bigger clinton lead. but there are other troubling numbers for trump. >> reporter: more than anything,

tom. hillary with a 20-point lead among women. that's a high water mark for her. 55% to 35%. even among men, she's winning 44% to 41%. if those numbers remain anything like that, you could be looking at not just a loss, but a blowout. where he has shown his greatest strength? >> reporter: he's losing dramatically among nonwhite voters. hillary has a 58% lead among nonwhites. but look at his support among whites. he only has a lead within the margin of error, 47% to 43% among whites. keep in mind, mitt romney lost the the election with an 18-point lead among whites. >> a significant gap, and time is running out.

app for live streaming breaking news reports from the campaign trail. let's turn to a massive manhunt under way in california. it started with a traffic stop that erupted in gunfire. >> shots fired! >> a police officer bringing a civilian on a ridealong. as he tried to pull over a car, the shootout starting. ron claiborne with the video. >> reporter: 4:30 a.m., the madera, cali madera, california, police officer with a civilian guest in his po at first it looks like the car is pulling to the curb, then it takes off. >> going to be in a pursuit. failure to yield. >> reporter: the officer turns on his siren in full pursuit. then -- >> he has a gun! >> shots fired. >> reporter: it turns right. then a volley of shots from the passenger side. >> shots fired! >> reporter: more shots fired, disabling the police car.

these photos taken later show the patrol car's shattered window. and how close the shots came to hitting the officer and the civilian. neither the neither the officer nor the civilian were seriously hurt, but the suspects got away. and tonight, they're still on the run. >> ron, thank you. overseas tonight, and the battle for mosul. intense fighting under way. a a -- liberating a liberating a village today. martha raddatz in the region tonight. >> reporter: the resistance has been fierce. a suspected isis suicide vehicle today speeding towards a convoy of advancing forces. those forces opening fire. after one narrow miss, then another, finally, the car is struck. catching fire.

some of the many -- as 30,000 troops push troops push towards mosul. there are about 5,000 americans on the ground in iraq, like the soldiers behind me. most are staying inside the wire, on bases. but there are about 500 out in the thick of it. defense secretary ash carter telling us in northern iraq, >> make no mistake, whether they're flying airplanes overhead, or advising on the ground, even ground, even behind the front lines, they're at risk. it's also important that everybody understands we must do this. we have to protect ourselves. >> reporter: u.s. troops we

risks. tonight, more than 1 million civilians remain under isis control in mosul. that's why the next phase of this operation is so difficult. trying to save the civilians while wiping out isis. tom? >> martha, thank you. now to the big chill moving across the country after a week of record heat. many temperatures and windchills dropping to near freezing. the first snow falling in the northeast, about half a foot on the ground in vermont. take a look at that. plus, snow and strong winds blowing across lake placid, new york. rob marciano here with us now. >> it does. the sun came out, melted a lot of that snow, but another shot of cold air and snow coming in tuesday and wednesday. >> temperatures in the morning on wednesday, feeling like at or below freezing. boston, new york, philly, d.c., even pittsburgh. those are the windchills. and a bit of a warming trend after that. looks like above average temperatures into the beginning of next week. several storms coming into the west, going to have some wind with it.

and one or two more storms mid and late week, into washington and southern california. a busy week ahead for the west. >> rob, thanks so much. now to the megabusiness deal creating a new media giant. at&t agreeing to buy timewarner for $85.4 billion. the move allowing the company to both produce and distribute content to millions of customers. the sale will require the approval of government regulators. now to showdown decades in the making. the chicago cubs celebrating their first national league pennant in 71 years. history history in the making for one team, extreme heartbreak waiting for another. here's alex perez. >> reporter: tonight, the lovable losers are finally winners. a champagne shower uncorked in the locker room. tears in the stands. >> it's hard to believe.

it's my firs it's my first time here. and i love seeing the cubs win. >> reporter: the cubs winning the pennant in front of their longsuffering fans. >> the city has let us know, they're hungry for a moment like this. we're so excited to be a part of the team that gives them an opportunity to see a chicago cubs team in the world series. >> reporter: >> reporter: pearl jam frontman eddie vedder, just one of the fa the last time the cubs made it to the fall classic, 1925. a loaf of br a loaf of bread cost 9 cents. it was there, that billy cast a curse on the team. after he and his smelly pet goat were kicked out of the game. and the curse of the billy goat was born. a curse these fans believe is finally broken. >> it's amazing. it's been a lifetime in the making. >> reporter: all day, fans have been lining up to take a picture in front of the marquee here.

series in 1908. they are taking on the cleveland indians, whose last win was in 1948. so, the stakes are high across the board. tom? >> chicago native, alex perez celebrating with all the cubs fans there. alex, thank you. still ahead on "world news tonight" this sunday, the intensifying search for a missing hiker. and the new worry for rescue teams tonight. plus, the bonus pay about-face, about-face, sparking outrage among american servicemen and women and their families. and the boat capsizing in the gulf of mexico. what may have made all the difference here. stay with us. ying ] have fun with your replaced windows. run away! [ grunts ] leave him! leave him! [ music continues ]

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soldiers fighting a new battle against the military they once proudly served. >> i had done everything they asked of me. these were promises they've made. >> it's causing a lot of stress. >> it was a slap in the face. >> reporter: during the height of the wars in iraq and afghanistan, the national guard offered bonuses. >> if we could wave the magic want and make it go away, we would. but then we would be breaking the law. >> reporter: but now the military wants that money ba to soldiers with skills in high demand. but the pentagon says it paid out bonuses to guardsmen who never should never should have qualified for the extra cash. california going after 9,700 current and retired guardsmen. $22 million already recouped. >> month after month, paying about $1,300. >> reporter: this soldier,

repay $46,000 in bonuses. >> you still have thousands of soldiers having to pay this money back. >> reporter: another soldier refused to pay. >> i felt totally betrayed by my commanders. >> reporter: after he filed a lawsuit, the pentagon waived his bonus repayment. but he's not dropping the case. >> are any of the soldiers getting to keep their bonuses? >> can >> they've waived a lot of them, but thousands still having to repay. >> and some having to pay more than $40,000. eva, thank you. coming up next, the family hoping for a miracle. the race to find a 21-year-old hiker. plus, on plus, one man's problem with

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where he was having a little bit harder of a time. >> reporter: enter tornado, trained from birth to be a service dog specializing in autism. taught to guide him around danger. and to help him keep safe. to be loyal. so, about that moment when the two of them met. here's why mom cried. >> seeing him immediately, when he laid down, and the relationship being reciprocated back to him, it was breathtaking. >> reporter: because n friends. and in kai, that shows. >> he seems so much more content. he seems more fulfilled. >> reporter: a team, boy and dog, inseparable. john donvan, abc news. >> so tonight, we salute kai and

ribeiro: her ribeiro: here's a sneak peek at tonight's "afv." we know you're gonna love it. ? [ screams ] [ clicking ] woman: bye. oh. [ crash ] woman: oh! [ applause ] welcome to "america's funniest home videos."