threats before. and breaking news as we come on, the governor, the sex scandal and the reds nation moments ago. good evening. it's great to have you with us on a monday night and we begin tonight with the deadly school shooting in san bernardino. authorities say a man with a gun checked in at the office and headed straight to a class room. he shot and killed a female teacher, two students were hit, too, they are in critical condition tonight. the teacher did not survive. he then killed himself. tonight, the police chief now with a possible motive. abc's kayna whitworth on the scene tonight. >> reporter: tonight, those troubling images. >> i just wanted to go home. >> reporter: young children evacuating an elementary school after shots rang out, crossing a basketball court in formation to get to safety. >> possible active shooter at north park elementary. >> reporter: the emergency calls coming in just before 10:30 in the morning. authorities say an adult male checked in at the front desk to visit a female teacher. police say that man then entering a classroom and shooting the female teacher before turning the gun on himself. tragically, two students caught up in the violence, both shot and rushed to local hospitals by air and ground. >> this does appear to have been a murder-suicide. with both male adult and female adult victim succumbing to injuries. >> my partner is carrying one out to the front. okay, we believe we have the shooter down inside. >> reporter: tonight, those children in critical condition. the suspect and the teacher who was shot, both dead. the father of a second grader describes what he did the moment he heard there was a shooting at his daughter's school. >> i fell to my knees and started saying our father's and hail mary's. >> reporter: heavily armed officers and s.w.a.t. teams rushing to the scene, arriving at north park elementary school in san bernardino in just four minutes. as parents flooded to the school looking for answers. >> my son is in school and he just sent me a message. >> the school, a crime scene. s.w.a.t. teams swarming the area. some parents able to see their parents but they couldn't reach them. not able to hug them. >> oh, my gosh. she doesn't see me but i can see her. it looks like they're all crying and holding hands. >> reporter: row after row of students moving across school grounds. getting on buses taken to a safe location before being reunited with their families. authorities tonight say they believe they know who that subject is and they're searching his home. meanwhile, emotional images, parents finding their children moments after confusion. >> kayna whitworth live with us from san bernardino. authorities believe they now know who the subject is. what are learning about a possible motive here. >> david, right now, authorities are trying to determine the relationship between the shooter and the female teacher. they're also saying that they believe the front desk staff was familiar with this shooter. david? >> kayna whitworth leading us off. thank you. we turn to the chaotic scene unfolding on a united flight in chicago. initially passengers were told the flight was overbooked. four passengers were told to get off. one of the passengers was dragged down the aisle and off the plane bleeding from the struggle. he did not want to give up his seat. tonight the airline's exblow nation. we ask, what are your rights once you board the plane? abc's david kerley covers aviation. >> ow. >> reporter: it is a stunning scene. that passenger, yanked from his row. >> oh, my god. >> reporter: lip cut, dragged off a united jet, refusing to give up his paid seat. >> my gosh. >> reporter: tonight, an aviation security officer involved here, put on leave. but so many are asking, how could this have happened? john klassen in the orange shirt, saw and heard it all. >> after having done really nothing other than this is my seat, i've bought and paid for it. i need to go to louisville. i could not believe what i was seeing or hearing, i was in shock. >> reporter: united airlines told passengers the flight was overbooked. it now says it was a crew transport issue, four seats needed to get a crew from chicago to louisville. $800 in vouchers offered, no takers. so, a united's computer picked four passengers, including the 69-year-old man who said he's a doctor, saying he had to get home to treat patients. the man slipped back on the jet. >> i need to go home. i need to go home. >> reporter: before he was removed again. united's ceo calls it an upsetting event. apologizes for having to reaccommodate these passengers. but no direct apology to the man. the overbooking, even demanding a paying customer give up a seat, is perfectly legal. >> it's part of a document that nobody ever looks at called the contract of carriage which basically gives the airline, the pilots the flight attendants all sorts of rights to do pretty much whatever they want. >> all right, david kerley live with us tonight. you reported there it's in the fine print part of the contract in the ticket. they can order you to get off even when you're on the plane. >> but passengers do have right. they're due compensation if they get bumped from the plane. >> a lot of people weighing in on this one today. david kerley thank you. we turn to an image syria is quite proud of this evening, planes taking off from very airfield targeted by u.s. cruise missiles last thursday night. those jets taking off from that same base. and there was a moment today at the white house when our correspondent asked is there a new red line on syria? the white house answered but then changed the answer later this afternoon. here's abc's senior white house correspondent cecilia vega. >> reporter: president trump picking up the phone to congratulate the commanding officers aboard those navy ships that launched 59 missiles into a syrian airfield. but from the looks of these images on russian state tv, that airbase is back in business, planes taking off, once again. tonight, new accusations that russia was well aware of bashar al assad's chemical weapons stockpile. >> i believe that russia knew about the chemical weapons because they were operating from exactly the same base. >> reporter: this as the white house seems to shift its red line on syria, saying it's not just the use of chemical weapons that would provoke an american response. >> is the red line -- just to clarify, the red line for this white house chemical warfare? is conventional warfare enough to get the president to go further there than -- than this white house has gone before? >> the answer is, is that if you gas a baby, if you put a barrel bomb in to innocent people, i think you can -- you will -- you will see a response from this president. that is unacceptable. >> reporter: but assad has frequently used barrel bombs against his own people, nearly 13,000 last year alone, according to human rights groups. spicer's statement, not the only mixed message on syria from the trump administration, top officials, divided on whether or not assad should stay or go. secretary of state rex tillerson saying it's up to the syrian people. >> we believe the syrian people will lawfully be able to decide the fate of bashar al assad. >> reporter: but u.n. ambassador nikki haley all but advocating for a regime change. >> it's going to be hard to see a government that's peaceful and stable with assad. >> reporter: the white house now seeming to echo that. >> how far is the president willing to go to see bashar al assad out of power there? >> so, just to be clear, i can't -- i don't think it's -- it's -- you can't imagine a -- a stable and peaceful syria with assad as -- as -- in charge. >> reporter: tonight, from syria, russia and iran, a joint statement, accusing the u.s. of crossing a red line with its missile strikes, warning, "from now on, we will respond to anyone, including america, if it attacks syria and crosses the red lines." it comes as secretary of state tillerson heads to moscow for talks. as exxon ceo, tillerson once shared champagne with vladimir putin. but this time, there's no plans for the two to meet face-to-face. >> cecilia live with us from the white house. we heard sean spicer tell you if al assad barrel bombs innocent people that president trump will respond. but tonight, the white house walking that back now? >> they certainly are, david. in fact, they're emphasizing that quote, this is not a shift in u.s. policy. they say nothing has changed if in fact the assad -- the white house decided to go after assad for the use of barrel bombs. this would mark an incredible shift in u.s. policy. david. >> all right, c us from the white house tonight. next this evening, new report on the deadly attacks just as the christian holy week begins. this video right here showing one of the bombers being directed to go through a metal director, instead stepping back towards two police and blowing himself up. isis taking responsibility with a new warning that's there's more to come. here's abc's brian ross. >> reporter: the choir was singing when a bomb hidden under one of the crowded church pews went off. [ explosions ] [ screaming ] >> reporter: the camera feed went to a test pattern, but the audio of the chaos and the screams could still be heard from inside the church. it was one of two palm sunday attacks on christian coptic churches in egypt. in the second attack, surveillance cameras show a suicide bomber trying to avoid going through a church metal detector. as he is directed by a guard to go back, he detonates his explosive vest. even before today's funerals for the 44 worshipers who were killed, isis had claimed responsibility and spread fear across the christian world with threats of more to come. >> i think it is a tense time going into holy week at any church or large gathering of worshipers. >> reporter: isis has killed far more muslims than christians, but its war on christianity goes back to its founding, imagining attacks on rome, photo-shopping the isis flag over the vatican. as pope francis sunday deplored the isis church attacks, security officials at the vatican and churches around the world were making plans to enhance the already-high security for the coming holy week. >> despite that threat from isis the pope still plans to travel to egypt. >> yes, that trip is still on. the vatican said the pope's mission to be beside his brothers in egypt in time of difficulty. we're also following breaking news tonight coming in from the alabama statehouse. the governor caught in a sex scandal there, just a short time ago resigning just as an impeachment hearing was getting under way. abc's steve osunsami is in montgomery tonight. >> reporter: it's a shameful ending tonight for a governor who's also a deacon at his baptist church, and recently argued that marriage is a holy union between one man and one woman. >> i have decided it's time for me to step down as alabama's governor. >> reporter: alabama governor robert bentley didn't just have one woman, he had two, the campaign aide who authorities say he paid with money that he strong-armed from donors, and the wife who got even when she recorded cell phone conversations with his girlfriend, and then turned them over to police. >> baby, let me tell you what we're going to have to do. >> reporter: his alleged mistress, rebekah mason, is a campaign consultant and a former beauty pagent winner 20 years his junior. >> reporter: the governor is pleading guilty to two misdemeanor campaign finance violations. he'll avoid real jail time. david sf. >> steve osunsami with the late developments for us. next to that moment of victory for president trump. his supreme court nominee now on the bench. neil gorsuch sworn in as the 113th supreme court justice during a rose garden ceremony tonight. he replaces antonin scalia. among the cases that could come soon, president trump's travel ban. the manhunt now going nationwide tonight. the suspect accused of stealing high-powered weapons. new details from his manifesto and threats he's made before. the judge shot and killed outside his home. now the manhunt for the suspect who opened fire in that neighborhood. look out below. this scene on the american coastline. bea beachgoers shocked by what they were seeing. much more ahead. ♪ ♪ ♪ sfx: engine revving ♪ (silence) ♪ arbreak through your allergies. try new flonase sensimist instead of allergy pills. it's more complete allergy relief in a gentle mist you may not even notice. using unique mistpro technology, new flonase sensimist delivers a gentle mist to help block six key inflammatory substances that cause your symptoms. most allergy pills only block one. and six is greater than one. break through your allergies. new flonase sensimist ques...are my teeth yellow? 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>> reporter: joseph jakubowski on the run since tuesday. authorities say he stole 16 high-powered handguns, two assault rifles, and possibly gun silencers, then set his own car on fire. the suspect's stepfather saying that he believes jakubowski is on a do or die mission. >> i'm afraid that he's trying to commit suicide by cop. >> reporter: you don't see his face, but the person recording the video appears to sign the envelope containing the manifesto. >> today's the day. so, remember this face. >> reporter: officials tell us they're skeepg with the person on the other side of the camera. he's cooperating and he is not a suspect. we talked to a woman who said that she's jakubowski's sister. she said no one has heard him david. the two former presidents back together and sharing stories about their grandchildren and their socks. more on that urgent manhunt after a judge is shot outside his home. and the stunning aerial pictures tonight from above the great barrier reef, drained of its color. skeen tiss now revealing why and their concern tonight. 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(announcer) you can quit. for free help, call 1-800-quit-now. we asked people to write down the things they love to do most on these balloons. travel with my daughter. roller derby. ♪ now give up half of 'em. do i have to? this is a tough financial choice we could face when we retire. but, if we start saving even just 1% more of our annual income... we could keep doing all the things we love. prudential. bring your challenges. finally tonight here, america strong. would you remember your prom date, everything about them even after six decades had past? would you take the chance and call her? tonight, one man who did. this was when they first began dating. joyce kevorkian and jim bowman during their senior year of high school in elmhurst, illinois, 1953. they went to prom together, and then as life goes, they went their separate ways for college. both met new loves and started families. they were happily married more than 50 years. and recently, they both lost their spouses. it was difficult, but jim remembered joyce from all those years ago. they'd lost touch. but he would soon learn she had suffered loss, too. after looking her up, and what did joyce say? >> i said, "nice to hear from you again." and we started talking on the phone. and then he said, "why don't i come over and see you?" and i said, "that'd be good. i'd like to see you again." >> there was a spark, you know? they say that you never forget your first love. and there must have been a spark that was smoldering in each of our hearts that we never realized. >> reporter: and when they saw each other after all those years -- >> i recognized him. he has less hair now then he had then. >> we said to each other, "i wonder if it'd be possible to pick up where we left off 64 years ago." >> reporter: they got to talking, and never stopped. >> one day on the phone he said, "will you marry me?" and i said, "yes, that's a good idea." so we did! >> reporter: the two high school sweethearts tying the knot, 64 years after that prom, both of their families right there. >> without hesitation, we said yes. and that's where we are now, a week into our marriage. [ laughs ] >> that's right. >> the next chapter 64 years later. >> thank you for watching. i'm david muir. i hope to see you right back here tomorrow. from all of us here, good night. this is "jeopardy!" here are today's contestants -- a homemaker from erda, utah... a direct service provider from new york, new york... and our returning champion, a radio copywriter and voiceover announcer from casper, wyoming... ...whose 1-day cash winnings total... and now here is the host of "jeopardy!" -- alex trebek! thank you, johnny. thank you, ladies and gentlemen, and welcome to "jeopardy!" i'm delighted to welcome back our champion, pat. good to see you again. greg and maren, welcome aboard also. and good luck to all three of you. let's go to work in the "jeopardy!" round. easier round of play, today featuring these categories...