ever. nightly news begins now. from nbc news, world headquarters in new york, this is "nbc nightly news" with kate snow. we gee r begin tonight with a story, a horrific and brutal crime tailored to the reality we all live in now where social immediate allows people to broadcast their every move in realtime. cleveland police are scrambling to finds a man who they say shot someone point blank while live streaming it on facebook. the man also claimed to have committed multiple other mom sides. authorities say he is armed and dangerous. we get the latest from steve patterson. >> a city wide manhunt. police scouring the streets searching for a man suspected of live stream agexecution in broad daylight and telling viewers he's responsible for several more deaths. graphic video streamed on facebook live appears to show the suspect getting out of his car, telling a stranger he's going to die because of a woman. l. >> she's the reason why is this might happen to you. >> reporter: the final frames show the man raising a handgun, a shot rings out and then the victim laying in a pool of blood. >> it's real shocking. it's a killer trying to show his power. >> reporter: police identify the suspect as steve stevens. >> we know who he is. he will eventually be caught. >> reporter: on his facebook page taken offline, stevens claims to have killed up to 15 people. >> i'm going to try to kill as many people as i can over here. >> reporter: city posted a video manifesto about the spree before live streaming the suspected murder. >> it's like i'm always the bad guy. >> reporter: a horrifying new reality, murder streamed live on social media. tonight the fbi is joining with cleveland police in tracking stevenss. a senior law enforcement official in the department says stevens had listed addresses where he claimed additional shootings occurred. police say so far, they haven't found anything when they went to search those locations. right now they are describing him as armed and dangerous, telling everyone if he's spotted to stay away and call 911. fur >> reporter: new concerns about the threat from north korea of another provocation from a young dictator lashing out, but this time the missile test failed, blowing up moments after launch. now the question, was american sabotage involved. nbc's janis mackey frayer has all of it covered on the ground in seoul, south korea. >> reporter: just hours after north korea flaunted its military strength, a failed missile test exposed its weakness. the medium range missile blew up less than five seconds after launch. according to a white house foreign policy adviser, the u.s. has good intelligence before and after the test, some speculating whether "uss sabotage through covert electronic warfare could have factored into the failed launch. >> we don't know yet. it could be sabotage. it could be poor engineering, just bad luck. that's the nature of these missile programs. it is clear u.s. policy has been to do everything possible. >> reporter: whether or not the u.s. played a role, the failed launch is an embarrassment for kim jong-un and not good for the u.s. or the region either. the concern, that north korea will try a nuclear test or a long-range missile, what south korean officials called clear acts of threat. north korea says it is close to testing an intercontinental ballistic missile. if and when it does, a game changer for the united states. >> i think there's an international consensus now, including, including the chinese and the chinese leadership that this is a situation that just can't continue. >> reporter: amid the turmoil, vice president mike pence arrived to seoul for meetings about the north's nuclear threat and spoke to american troops stationed here. >> this morning's provocation from the north is just the latest reminder of the risks each one of you face every day. >> reporter: also heading to the peninsula, a u.s. naval strike group, able to shoot down incoming missiles and launch their own. the vice president's visit to south korea was planned long ago, but has taken on new significance to reassure an ally and to discuss military options to contain the threat. kate. janis, thank you. staying overseas, a surprise visit by the national security adviser h.r. mcmaster in afghanistan where some 2400 americans have lost their lives since the start of the war over 15 years ago. the visit comes just days after the u.s. dropped the biggest nonnuclear weapon in its arsenal targeting a complex where isis militants were based. our pentagon correspondent has more. >> reporter: h.r. mcmaster getting close to the point of impact of the so-called mother of all bombs which collapsed terrorist tunnels and killed dozens of isis fighters. it is sending political shock waves across the country. former president hamid karzai demanded that the u.s. leave afghanistan and called his successor a traitor, tweeting, it is upon us, afghans, to stop the usa. mcmaster's delicate diplomatic mission publicly bolstered the current government still fighting a relentless insurgency. >> what is clear is that the stakes are high. this is the modern day frontier between barbarism and civilization. >> reporter: president donald trump is now considering his generals' request to add a few thousand more troops to the almost 9,000 already in afghanistan. >> now you've got to put outside eyes on it. we're losing in afghanistan. it is going down the tubes. general mcmaster is there to come back with a no kidding assessment. >> reporter: mcmaster making the second unan announced second trip to a war zone in two weeks after president trump's son-in-law jarod kushner flew to iraq with the chairman of the joint chiefs of staff. kate, tomorrow mattis heads west to meet allies all three getting firsthand accounts on whether trump should take the fight to isis and deepen america's involvement in afghanistan, america's longest war. >> thank you. here at home, president trump was up and on social media this morning from his estate in south florida, wishing folks a happy easter along with a flurry of messages over everything from north korea and china to the protest marches about his tax returns. as nbc's kelly o'donnell reports, there was no break this holiday from a presidential tweet storm. >> reporter: no comment is not the president's usual approach. but his silence on north korea's failed launch is message discipline to deprive kim jong-un of attention. while the white house reaches out to the china for help. >> what the president was able to convey to it the chinese president is that north korea is no longer an asset. north korea is a liability. >> reporter: today the presidential motorcade rolled along the ocean's edge to a palm beach church where the trumps celebrated easter services. after a surprising 40-hour break from twitter, he unleashed a spring storm of five tweets. the president explained his shift on china. why would i call china a currency manipulator when they're working with us on the north korean problem? senator mccain said the president is right to lean on china. >> china can shut them down. we should be -- whether they're currency manipulators or not, we should expect them to act to prevent what could be a cataclysmic event. >> reporter: in a more defensive move, the president linked his victory to his refusal to release his tax returns. >> i did what was almost an impossible thing to do for a republican, easily won the electoral college. now tax returns are brought up again. >> every other president has shown their tax returns and i think there's something in there that he wants to hide. >> reporter: his irritation evident after saturday's nationwide protest called the tax march. >> someone should look into who paid for the small organized rallies yesterday. the election is over! and the first family on board air force one arrived back at joint base andrews just a short time ago heading into tomorrow and one of the biggest logistical operations for any white house. it's the easter egg roll. that means tens of thousands of family members, children doing all kinds of activities on the south lawn. for the first lady and her small staff, it is a logistical challenge and a test to see how well the trump team can organize such a major event. kate. >> usually a lot of fun though. kelly o'donnell, thanks so much. >> this week is the political world has its sights set on a special election for a house seat in the atlanta. democrats are hoping a win in one of the first contested elections of the trump ish ra could be a signal of strength and pinning their hopes on a rel lively unknown candidate. abe gutierrez has our report. >> this is a historic election for georgia. >> reporter: this week at least, he's the new face of the democratic party. >> how are you? >> reporter: john ossoff is 30 years old, a former kong greggs counsel aide who is suddenly topping the polls in georgia's sixth district. >> reporter: is 24 special election in georgia a referendum on donald trump? >> this election like all elections is about local issues and local solutions before it's about national politics. >> reporter: but many democrats see it as much more. he's raised a whopping $8.3 million since jumping into this race in january. unheard of for a previously up known candidate. >> i will be an independence minded voice for this community. >> reporter: these supporters drove here from south carolina. >> i think people really want to get involved. people want to jump in and show their resistance. >> we really appreciate your support. >> reporter: it's a crowded field, 18 candidates are vying for the seat vacated by health and human services secretary tom price. leading the polls among republicans is karen handle. >> the other guys in this race want to play games. >> reporter: who is blasting ossoff for his out of state donors. >> the largest percentage of contributions if you rank them by state goes california, new york, massachusetts. >> reporter: the gop has dominated this affluent suburban district outside atlanta for decades. it was newt gingrich's old seat but donald trump barely squeaked out a victory here against hillary clinton and democrats nationwide now see an opening after coming unexpectedly close in a kansas race last week. >> this ultimately is just one house seat and it could end up not really being that indicative of 201, but it does matter right now as a symbol of whether or not democrats can strike back against trump. >> in this great diversity together. >> reporter: to win outright, he would need to hit 50% of the vote on tuesday. he if he doesn't, the top two candidates will be go head to head in a june runoff. >> i think we're going to do it. >> reporter: abe gutierrez, roswell, georgia. >> tomorrow morning the u.s. supreme court begins can hearing the final cases of the term and the new jest justice neil gorsuch will take his seat on the bench for the first time. he could make a big difference in one of those cases involving freedom of religion. our justice correspondent pete williams has that story. >> please raise your right-hand and repeat after me. >> reporter: the arrival of neil gorsuch with a conservative judicial record restores the ideological makeup of the u.s. supreme court. he takes the seat left vacant by the death 14 months ago of antonin scalia, giving the courts generally conservative justices once again a 5-4 majority, and that may make a difference in one of the most important cases. of the term involving religion and government. on wednesday, the court hears that the preschool was left out of a program to improve school playgrounds. missouri's constitution says no state money can ever be spent to aid a church. but the church says it should not be treated differently when it comes to making playgrounds safer. >> the constitution is clear, the government cannot treat people of faith and their religious organizations like second class citizens. >> but more and its supporters say it's not interfering with the church's religious practices. it just won't subsidize them. >> it is a radical departure from the idea that if you need something done in your church, you ask the parishoners to dig deeper into their pocket and pay for it themselves. >> reporter: as a federal judge, gorsuch has been sympathetic to claims you have religious discrimination. >> it was his views on religious liberty that might have been the most persuasive thing to conservative advocates when he was nominated. it would be a surprise if he weren't in favor of the interests of the church in this case. >> reporter: justice gorsuch may play a role in deciding if the court will the hear a case whether private businesses like bakers and florists can refuse on religious grounds to provide services for same sex weddings. there's a new twist in the missouri religion case. the newly elected governor says the state will no longer automatically turn down requests for money from churches. so neil gorsuch and the other justices must now decide if they still want to hear the case. >> pete williams at the court. thank you. at the vatican today, tens of thousands of faithful backed into st. peter's square for the pope's annual easter sunday mass. the pope used his message to denounce oppressive regimes and urge leaders to stop the spread of conflicts around the world. without naming any specific countries he also spoke of god walking beside all those forced to leave their homelands. still ahead tonight, hi-tech hangouts increasingly popular technology that's helping friends connect. it's even helping kids actually talk to their parents. and later, an iron man with the heart of a champion. inspiring america. don't look now but we have news tonight that might come as a welcome surprise to parents. after years of e-mailing and texting and tweeting, more and more kids are actually getting together in groups and talking to each other again face-to-face. though that doesn't mean they're all in the same place. nbc's katie beck shows us how. >> reporter: it's about a room more i heard from sean. >> reporter: it's a typical afternoon for high schoolster gracie miller. >> welcome. >> reporter: she's socializing with friends under the same virtual roof. >> you'll get a notification every hour and you get sucked in. which isn't the worst thing. i love getting sucked into the app. >> reporter: she's talking about an app called house party, run of several realtime video chats on the market for up to eight people to chat at once. group chat is nothing new. remember this scene everyone bye bye birdie. ♪ >> reporter: but today's teens have their own hi-tech version and it's blowing up. >> i'm really addicted. i have senioritis right now, four hours out of that i day i'm on social media. >> reporter: the app sends a push alert when friends are able to chat or in the house. similar apps are getting teen traction. millions of daily users. on average, young people check their phones 82 times a day. >> it's all about being aware of what your child does, look for moderation and balance. >> reporter: digit is media professor yalda uld za says these apps have a benefit. verbal communication, not just text. >> if they can't can be face-to-face, it's a great substitute. >> reporter: gracie's mother agrees and plans to use house party herself when gracie heads to college this fall. >> how are your grades? do you have a boyfriend. >> what does he look like? does he want to talk to the rest of us? >> scope him out. >> exactly. >> reporter: but for a little while longer, gracie will live at home having house parties every day. katie beck, nbc news, los angeles. up next tonight, a historic discovery. a hidden chamber underground at the site of an ancient church. wait till you see what they found. stay with us. we're back now as promised with that discovery in london that we're just now learning about this easter. it's at the site of a historic church, a secret underground tomb locked away for century abc found by accident. it sounds like something out of the movies and nbc's matt bradley tells us what was inside. >> reporter: this easter, a resurrection of a different kind. a london museum announced a discovery of near biblical proportions. a secret crypt hiding the remains of five archbishops, anglican church leaders dating back more than 400 years. builders discovered the tomb during renovations a year ago. >> i came in, oh, it sounds like bad news, a problem. wow, it is the crown, it is the mitre of an archbishop. gleaming there in the dark. >> reporter: among them, richard bancroft, an early 17th archbishop famous for translating the bible to english. in all, some 30 corpses were buried in the church on the banks of the thames. researchers are wondering what other secrets this church may hold. matt bradley, nbc news. >> when we come back, a father and son team conquering incredible challenges together and inspiring america. finally tonight, the ironman is one of the most grueling races in the world, but it proved to be no match for a father and son team overcoming challenges in life, dad helping his son achieve his dreams with encouragement from his olympic hero. maya rodriguez brings us tonight's inspiring america story. >> it is well before sunrise, and johnny hagar has already been awake for hours. >> hopefully, we can have a good time. >> are you ready to go? >> reporter: johnny was born with cerebral palsy, a disorder that affects how his muscles work. but it is not stopping him from joining nearly 2,000 other competitors for a half ironman in florida. >> people in wheelchairs are as capable of doing things as they want to be if they put their mind to it. >> reporter: johnny's partner in the race? his father jeff who will push and pull his son for hours, 70.3 miles of swimming, biking and running. >> he's been dying to be an athlete his whole life. so this gives an opportunity for him to do it. >> reporter: their first attempt was at the world ironman competition in hawaii last year where they didn't finish. so they kicked their training up a notch. >> the most valuable piece is the soul and the heart and the drive, and that comes from something that's bigger than you. >> johnny's finding inspiration from michael phelps. ♪ it's the last goodbye ♪ >> reporter: taking the swimming legend's under armour campaign and creating this image of him imitating his hero side by side. struggling, pushing and overcoming. michael phelps tweeting his support to johnny and following up with an encouraging phone call. >> he is a great athlete, but he also inspires countless people. just like i want to do in my life. >> a dream realized as johnny and his dad cross the finish line. five minutes under their goal time. >> johnny was elated so all is good in the world today. >> reporter: savoring a victory and proving the old adage, champions are made, not born. johnny was inspired by a great athlete. but now he's the one inspiring others. maya rodriguez, nbc news, haines city, florida. >> and five minutes under their goal time. that is "nbc nightly news" for this sunday. lester holt will be here tomorrow. i'm kate snow reporting from new york and i'll see you tomorrow on msnbc. for all of us here at nbc news, have a happy easter and a great night. a new round of rain, impacting easter plans for thousands of peoin . right now at 6:00, a new round of rain impacting easter plans for thousands of people in the bay area. >> the news at 6:00 starts right now. good evening, thank you for joining us, i'm terry mcsweeney, peggy bunker has the night off. rain has returned, drivers making their ways across slick roads on easter sunday on the left side, santa clara street and people making their way to the sharks game. it starts in about an hour or so. meteorologist rob mayeda joining us now and how much longer this rain will be around. rob? >> san jose, the cloudy skies and on the other side light rain still falling. nappy about a quarter inch and san francisco and oakland less than that. san rafael, less than a fifth of an inch of rain

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