robbing them of their freedom? and the heart-stopping buzzer-beater. the clock counting down that half-court shot. >> are you kidding me! >> bring on march madness. good evening, and thank you for joining us on this saturday. i'm cecilia vega. tonight, tensions higher than ever in the race for the white house just days before voters head to the polls. in dayton, ohio, today, this moment of panic at a donald trump rally. secret service agents rushing to his side after a protester tried to rush the stage. it comes after that chaos in chicago, violent clashes between protesters and supporters inside that auditorium. the event abruptly canceled. hundreds of demonstrators outside, too. two police officers injured. and tonight, donald trump taking no responsibility for any of it. the reaction from his rivals on abc's david wright starts us off at tonight's trump rally in kansas city. >> reporter: tonight, tensions on the trail are flaring up. donald trump just finished scolding one protester in dayton, ohio. >> i have to do it myself. >> reporter: when another leapt over the barricade. watch there, as the second protester rushes the podium. the secret service, instinctively flanks the candidate as agents subdue the protester. he's now been booked for disorderly conduct. >> thank you for the warning. i was ready for him. but it's much easier if the cops do it, don't we agree? what a great job. >> reporter: the trump campaign was already on edge today. after the melee last night in chicago. trump haters filtered in the arena. vent on disruption. >> donald trump is not welcome in chicago. we're going to make that clear. >> reporter: trump canceled the rally. from trump supporters. >> all: we want trump! >> reporter: fistfights. a police officer seen bloodied. today trump didn't back down. calling the protesters thugs and communists. >> some represented bernie our communist friend. or they have organized professionally staged wise guys. we got to fight back. >> reporter: the tensions simmering for months, have reached a boiling point. the rhetoric, increasingly violent. the candidate, sometimes egging on supporters, urging them to take on the protesters. >> i'd like to punch him in the face, i tell ya. knock the crap out of him. would you? seriously. >> donald trump has created a toxic environment, and a toxic environment has allowed his supporters and those who sometimes who seek confrontation to come together in violence. the gop ticket if trump is the nominee. >> i don't know. it's getting harder every day. >> reporter: here in kansas city, missouri, tonight, another big trump rally planned. heavy security inside the venue right now. all calm so far. but outside, the trump supporters and the trump haters are taunting each other. cecilia. >> david wright leading us off tonight. david, thank you. this weekend is crucial in the race for the white house. just three days until major primaries. here's the map, voters head to the polls in five states. hundreds of delegates at stake. tuesday is a make-or-break day for many of those candidates. bernie sanders hoping to win ohio after his upset victory in michigan. and hillary clinton fighting to keep her lead. tonight, both candidates leveling harsh attacks at donald trump. clinton calling his rhetoric, political arson. here's abc's mary bruce in cleveland. >> reporter: after the eruption of violence in chicago, tonight, the democratic candidates in agreement. accusing donald trump of playing >> the ugly, divisive rhetoric we are hearing from donald trump is not only wrong it's dangerous. if you play with matches you can start a fire you can't control. that's not leadership. it is political arson. >> reporter: bernie sanders is defending his backers seen in those crowds. >> what our supporters are doing is responding to a candidate who has in fact in many ways encouraged violence. >> reporter: but that's where their agreement ends. courting voters in chicago, sanders went after embattled mayor rahm emanuel, calling for clinton to reject his endorsement. >> i think he has done a very bad job. >> reporter: the candidates are making an all-out push. crisscrossing the key states and plastering the air waves. sanders is spending big in the midwest, especially in ohio, another surprise upset. >> ohio has the opportunity to lead this country forward. >> reporter: clinton is feeling confident in florida where she has a double-digit lead in several polls. >> thank you so much, tampa! >> and mary joins us now. all eyes on ohio before this tuesday primary and now a judge has ruled that some 17-year-olds will be able to cast a vote, so, mary, is the bernie sanders' team hoping this gives them a leg up? >> absolutely, cecilia, 17-year-olds here in ohio will be able to vote in tuesday's primary, so long as they're 18 come general election day in november. this is a big win for bernie sanders who has so far had young voters' support. we want to move on to historic flooding along the gulf. tonight, flash flood watches and warnings in six states and the rivers are still on the rise. in texas, take a look at this, the sabine river cresting. water. in covington, louisiana, boats were still taking people from their flooded homes today. across the gulf, thousands of families forced to evacuate and abc's phillip mena was there. >> reporter: tonight, the race to shore-up the banks of those rising rivers, from louisiana to tennessee. water up to 2 feet in some parts. more than a thousand homes flooded and more now threatened. >> if not for the sandbags -- >> reporter: the national guard crews rescuing nearly 2100 people over 5 days. hundreds of family pets scooped up, too. here in covington, louisiana, the winter family capturing when the water rushed into their home. they scrambled to save what they could before it was all ruined. >> this is about where it was. so, fortunately, that's the size it got up -- i'm sure it did a lot worse. robin and her husband caught offguard, too. it went from the ditch into your house in 20 minutes. >> 20 minutes. >> reporter: you didn't have time to throw sandbags in front of your door. the fire department is using trucks like that one and boats. it started around noon today and the rescues haven't stopped. they're trying to pull those still trapped inside their flooded homes to safety. >> phillip, thank you. abc meteorologist indra petersons joins us now. the guflg states are still going >> only the middle of march, in places like she reeveport, louisiana, setting records. showers still continue to push through that region. tonight, even though they're subsiding, we still have that threat for river flooding for the next several days. to make matters worst, the threat of severe weather through sunday. threat of tornadoes right in toward the west coast, a series of storms continues to make their way through. powerful system making its way the ground there is saturated. sierra, getting a lot of snow. >> thank you. we want to turn to new york's hudson river now, deadly crash on the water. the search still on tonight for two missing crew members. a barge and a tugboat colliding. the entire boat sinking. spilling 5 gallons of oil into the river. one bridge worker did not make it. and to a fiery collision in the west. police investigating what may be a drag race gone wrong. this fireball captured from the skies near seattle. three people injured in the middle of the night. the street in renton notorious for drag races. an overnight riot has a prison still on lockdown. these blurry images apparently taken by inmates. officials say the inmates started that fire and stabbed officer during the unrest. we have breaking news from new mexico tonight, the man hunt for two escaped convicts is now over. late today the second inmate was captured. this man convicted of this armed robbery that ended in a shootout with police. tonight, both he and his accomplice are now back in custody. and the investigation into how they got a way is under way. here's abc's ron claiborne. >> reporter: tonight, lionel clah in custody. after hiding in an apartment hundreds of miles away. >> he literally stepped out the front door, came out and surrendered. he did say to us, he didn't want anybody else to get hurt. >> reporter: they fled wednesday while being transported between prisons. they had been handcuffed and shackled. cruz was arrested friday after being spotted on the street on friday. >> how did you get out of your shackles? >> i picked it. >> reporter: hours after their by a hotel security camera. cruz said they had no outside help. investigators say they don't believe that. cruz was convicted of a drug-related murder. authorities in new mexico say the circumstances of that double escape is in their words suspicious. they're looking at the possibility of someone from the outside may have helped those two prisoners get away. and also, the possibility of someone from the inside may have helped them. >> thank you, ron. we want to turn overseas to heavy duty air lift involving elephants. more than a dozen of them. pulling off a secret rescue. now the debate over the their transfer intensifying. abc's eva pilgrim with the details. >> reporter: 17 elephants fighting to survive a severe drought are now safely in the u.s. an international mission. carrying them from swaziland to texas. they placed the 10,000 pound elephants on big rigs. >> it's been a long, trying time to get them here. and i am confident in saying that if we did not move these animals here they would not be alive. >> reporter: but it almost didn't happen. an animal rights group asking the court to stop the move but the judge siding with the zoos. the animal rights group saying they had a safe location and money ready to care for the elephants in the wild. instead the zoo secretly shipped them to the u.s. robbing them of their freedom. tonight, zoo officials standing firm saying the move saved the animals who were thin and in danger. jack hanna said the elephants will get top-notch care in their >> i would choose one of these zoos to go tonight. >> reporter: already tonight, their new caretakers posting pictures of them eating and drinking, saying the elephants are doing well. eva pilgrim, abc news, new york. we turn now to the buzzer-beater we can't stop watching here. less than a second to go on the clock. uconn and cincinnati and that prayer from half court, march madness bring it on. here's abc's gloria riviera with the shot that will go down in history. >> reporter: the game-winning layup was denied as the huskies refused to lose. in the first overtime the bearcats, again, missing another chance to finish it. cincinnati looking strong in triple overtime. with less than a second to go. boom, kevin johnson hits a three-pointer to seemingly seal the win. just watch. >> oh, my goodness! >> i'm so happy that shot went in. >> reporter: a 62-foot jumper, welcome to march madness. the freshman guard not even a great three-point shooter this season. but that shot forced a quadruple overtime. the huskies rolled in the fourth overtime, keeping hopes alive they'll have a spot in the ncaa tournament. >> what a shot. there's still much ahead on "world news tonight" this saturday -- caught on camera. airport workers helping themselves to your luggage. the warning for anyone packing for a trip. and she was a real hit at 106 years old. kicking up her heels at the white house, how the birthday girl is celebrating tonight at 107. so, can you guess the song she wants to dance to tonight? 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>> reporter: in this one aspect we are a united america, our uncertainty over this daylight saving thing. >> which way do we turn the clocks? >> backwards? >> reporter: the answer is that the clock moves forward tonight, one hour, which is the hour of sleep you're going to miss. unless, of course, you live in arizona or hawaii where daylight saving is not observed. including california, alaska and rhode island are looking to opt out of the twice-a-year time shift. why do we do this anyway? >> we were sleeping through those summer sunrises. that was considered a waste of resource. >> reporter: during world war i and world war ii, the u.s. went to daylight saving full time to save energy. but some studies today show people drive even more when it's lighter later and some say there are potential health drawbacks. one study in michigan showed that an association between tonight's lost hour of sleep and the jump in heart attacks a day later. still it's how we live, most of us. >> i like the fact that it will be lighter later. >> reporter: if you still find it confusing, at least your phone will have the right time on it tomorrow morning. just keep it charged. john donvan, abc news, washington. don't forget to change those "good morning america" and "this week" in the morning. i'm cecilia in new york. have a really great saturday. >> welcome to 'american medicine today' presented by the bonati spine institute, the world leader in advanced spine surgery. featuring the internationally acclaimed inventor of the bonati spine procedures, alfred bonati m.d.. now here along with dr. bonati your host kimberly bermel. > kimberly bermel: hi, i'm your host kimberly bermel. and welcome to 'american medicine today' brought to you by the