From nbc news World Headquarters in new york, this is nbc nightly news with kate snow. Good evening. One of the tornadoes that hit eastern colorado saturday was half a mile wide. And that was just one of many. As that weather system pressed east today, tornado watches went up across four states. Severe thunderstorms are also threatening parts of the plains, midwest, and south. In all, some 7 million americans are in the path of dangerous weather tonight. We get more from sarah doll dollop. Reporter twisters rumaged across northeast colorado, sweeping up debris and darkening skies. This massive tornado was one of several spotted in ray, colorado. It was one of the most photogenic tornadoes ive ever seen. It was that dramatic. Like no tornado ive ever seen literally in 35 years. Reporter there were no fatalities but at least five people were injured. Debris strewn for miles. Dozens of electrical poles were destroyed, leaving many without power. Never been through anything like this. Reporter outside denver, near the city of wiggins, a multivortex tornado lifted motor homes and uprooted trees. Campers upside down, sideways. Floating in the lake. A boat shed that just has been crushed. Reporter in arizona, a rare winter blast in flagstaff. Just an hour west, hail and rain were to blame for at least six injuries and two deaths on i40 which closed for hours yesterday. Arizona was one of ten states with reports of damaging hail saturday. As the storm pushes east, millions are in the threat zone. More tornadoes and hail possible in the countrys midsection through tuesday. Families urged to stay alert in the peak of tornado season. Sarah dollop, nbc news. In canada, its extreme drought fuelling that humanitarian wild fire in alberta thats been burning for a week now. It is now twice the size of new york city. Tens of thousands have been evacuated and it could be a long time before they can return. Miguel almaguer reports from the front line. Reporter this is what firefighters face. A monster inferno, devouring a dry forest. 1600 homes destroyed. Until fort mcmurray, firefighters lost their own houses, as they scrambled to save others. I dont consider myself a hero. But ive met more heroes in this experience than ive ever thought existed. Reporter Mass Evacuations continued through the weekend. Many coming to terms with their terrifying escape. I was on my knees in the truck thinking, am i going to get from north to south . Reporter with fire still raging, and parts of the city in ruins, going home isnt an option. The gas has been turned off. The power grids have been damaged. The water is not currently drinkable. Reporter but help has arrived. Donations are pouring in to evacuation centers. Carlos and carol moran were supposed to get married next week. Locals donated the rings, the tux, the Wedding Dress the couple needed. Pronounce you husband and wife. Reporter big donations are coming in from the smallest places. Lemonade stands, raising thousands. Were really lucky to be here. Reporter and on this mothers day, many are grateful for what they still have. I think shes going to love it, because i worked really hard on it. Reporter for evacuees, family has never been so important. Priscilla was separated from her son ryan during the escape from the flames. She waited four days for this moment. Its okay. Its okay, mommy is here. Okay. Ill never go anywhere. Reporter like many, they dont know if their house is still standing. But tonight, this is the only homecoming that mattered. With the Mass Evacuations now over, this fire has consumed 400,000 acres. Firefighters say there is good news. The weather is cooperating, they are slowly gaining the upper hand and this fire for now is moving away from homes. But they are quick to caution this blaze could turn on a dime, as it has in the past. Kate . Lets hope for that good news. Miguel almaguer, thank you. Exactly six months from this evening we will very likely know who our next president will be. November 8th, 2016. And this weekend, without any republican rivals left to challenge him, donald trump went after his new target, Hillary Clinton, in a big way. Our katy tur has been covering trump since he declared his candidacy. Can you imagine look. Can you imagine another four years of the clintons . Seriously. Reporter donald trump going allin against Hillary Clinton. Hillary clinton wants to take your guns away. On Foreign Policy, hillary is trigger happy. Nobody, nobody, perhaps in the history of politics, was worse to women or abused women more than bill clinton. Reporter on the trail, trumps crowds cant get enough of the hillary haters. The candidate feeding off of them, proving nothing is off limits. Despite what he told lester holt four days ago. Id like to see a very highlevel, policyoriented campaign. If theyre if they treat me properly im going to treat them properly. Reporter the clinton camp responding, its trump being trump. In a week in which donald trump casually suggested destabilizing the entire u. S. Economy, and cited his attendance at the Miss Universe pageant in russia as proof of his Foreign Policy experience, of course he wants to try and change the subject. Donald trump hasnt had to worried about black voters. He hasnt had to worry about hispanic voters. He hasnt really had to worry about women voters, either. But as he looked toward the general election, thats going to have to change. Reporter still, trumps appeal has been anything but predictable. Clintons strategy, brush off the dirt, and beef up on policy. Well, he doesnt have a view. He has a slogan. And he needs to be really pressed on that. Reporter clinton getting closer to clinching, adding more delegates in guam. As trump struggles to win over party leaders, like House Speaker paul ryan. See, i was blindsided a little bit. Because he spoke to me three weeks ago and it was a very nice call, very encouraging call. Reporter speaker ryans office disputes that claim saying he hasnt had a conversation with donald trump since march, well before the new york primary. When asked to clarify, the campaign told me that that was the conversation that donald trump was referring to. Kate . Katy tur. Thanks. If youre thinking of visiting an Amusement Park or carnival any time soon, rider beware. An accident this week that injured an 11yearold girl has people once again asking, are some of the most popular rides dangerous . Morgan radford has that story. Reporter what was supposed to be a fun ride at the carnival for elizabeth quickly turned terrifying. The 11yearold suffering a fractured skull after her hair got caught in the spinning ride called kings crown. Her friends capturing this video just moments before the accident. I stood up, and i was like yelling, i was like stop the ride stop the freaking ride reporter she was yanked from her seat and tossed to the floor of the ride. It was still spinning. I had to stop it with my hands and turn it to the point where it was to the platform. Reporter just two weeks ago in amarillo, texas, a father captured the exact moment his 6yearold sons seat belt became undone on this roller coaster. Days later in el paso two teens were ejected from a ride called the sizzler, leaving one dead, the other injured. While all appear to be unrelated, an uncomfortable and frightening reality. Carnival organizers in omaha promising to investigate. Weve never had an incident. So again, if theres an ongoing investigation. Reporter this kings crown will remain closed until its determined to be safe. Morgan radford, nbc news. In maryland, the man accused of shooting six people and killing three of them, including his estranged wife, has been charged with first degree murder, and other charges. The 62yearold suspect had worked as a federal protective service officer. His wife had filed a restraining order against him. And his guns were taken away. Police now think he obtained a new gun to carry out the attacks at a school and two shopping centers. Overseas, north koreas leader is known for his combative and aggressive threats but this weekend, kim jongun struck a conciliatory new tone. At a conference of lawmakers being held for the first time in 40 years, he said his countrys Nuclear Weapons will only be used for defense. Still, he had a warning for the united states. Bill neely has a rare look from inside north korea. Reporter Standing Ovations before he spoke a word, then kim jongun sent his message to america. He said he wouldnt use a Nuclear Weapon unless north korea was attacked by aggressors with nuclear arms. He means america. Were a responsible nuclear state, he said, he read his speech but he may as well have thumped his chest. This was nuclear boasting. After more wild applause, he said he wants to improve relations with countries that were hostile in the past. But the u. S. , he said, should stop sanctions, and pull out of the korean peninsula. Music to the ears of his generals, but u. S. Troops wont move from south korea. Kim jongun has delighted in launching missiles, and building Nuclear Weapons. Serving several rocket launches in recent months. The u. N. Dismisses his claims to have a miniature nuclear warhead. He said a Hydrogen Bomb explosion this year was, quote, thrilling. So theres no real sign of a policy change. And a u. S. Think tank says satellite images from north korea show what may be preparations for a nuclear test. The regime invited nbc news to cover this congress. But they havent let us in. Instead, they took us first to a wire factory. Then to a maternity hospital. This machine is a gift of kim jongun. Yes. Reporter in the capital, theyre rehearsing for a major parade, a show of unity and power. But kim jongun isnt about to give up his nuclear power, because that would be the end of him. His message that he wont strike first with Nuclear Weapons wont impress washington, and it wont stop the global sanctions against north korea. The world wants less talk from kim jongun, and more action to reduce nuclear tension. Kate . Bill neely inside north korea. Bill, thank you. Every one of us remembers exactly where we were on september 11th, 2001. Well, now, almost 15 years later, were getting a neverbeforeseen perspective on that day. Newly released images show a pained but focused president george w. Bush in the moments and hours after the attack. Heres kristen welker. Reporter these images are seared in our minds. Now a new look at that awful day. And the man who led the country through it. All captured by thenwhite house photographer eric draper. I was documenting a nightmare. I used the camera to actually shield my fears. Reporter draper documented president bush that morning visiting a florida elementary school. And then those terrifying moments after he learned what happened. Sitting at a childsize table, writing remarks he would deliver moments later. Terrorism against our nation will not stand. Reporter the president then whisked away on air force one to louisiana. Watching the horror on television. Security concerns keeping him away from washington. He really wanted to lead from the oval office. He didnt want to be on the run. Reporter the phone calls, the candid moments exposing his own feelings. You had to go through a range of emotions that day like all of us. Reporter finally returning to the white house that evening to once again address a broken nation. A country and commander in chief bracing for a future they could not yet imagine. Kristen welker, nbc news, washington. When we come back, the fight against cyber crime. Pitting hackers against hackers. Plus a labor of love, the excruciating detail that goes in to bringing van goghs my belly pain and constipation . They keep telling me drink more water. Exercise more. I know that. Try laxatives. I know. Believe me. Its like ive. Tried. Everything my chronic constipation keeps coming back. I know that. Tell me something i dont know. vo linzess works differently from laxatives. Linzess treats adults with ibs with constipation, or chronic constipation. It can help relieve your belly pain, and lets you have more frequent and complete bowel movements that are easier to pass. Do not give linzess to children under 6 and it should not be given to children 6 to 17. It may harm them. Dont take linzess if you have a bowel blockage. Get immediate help if you develop unusual or severe stomach pain, especially with bloody or black stools. The most common side effect is diarrhea, sometimes severe. If its severe stop taking linzess and call your doctor right away. Other side effects include gas, stomacharea pain and swelling. Talk to your doctor about managing your symptoms proactively with linzess. I built my business with passion. But i keep it growing by making every dollar count. Thats why i have the spark cash card from capital one. I earn unlimited 2 cash back on everything i buy for my studio. And that unlimited 2 cash back from spark means thousands of dollars each year going back into my business. Thats huge for my bottom line. Whats in your wallet . Cyber criminals cost americans billions of dollars a year. And a lot of them are based in romania. But that small Eastern European nation has also been on the forefront of fighting the problem. Senior investigative correspondent Cynthia Mcfadden reports from a city thats being called hackerville. Reporter this is transylvania, a region that conjures up frightening images of count dracula. Down in the foothills, seems the vampires around here are not after your blood, but your money. Historically cyber crime has been a big problem here in romania. A lot of reporting focused on the town. Reporter its become known as rockerville. What we saw for a large period of time, and still continuing is what we would consider online fraud or auction fraud. Reporter american victims would send money to romania, thinking they were buying something online. But would never get the merchandise. The Romanian Government made fighting cyber crime a national priority. And they have had some success. We try and we dismantled a group here. But, a way the group appears in another place. Reporter Sophisticated Software allows the cyber criminals to hide their true location. This is a kind of chess game. They could be physically here. But virtually they could be in singapore. Reporter the romanian cyber culture has bred not just scammers, but hackers. Meet this internationally known 24yearold. Hes known by his nickname, sim code and he was convicted in romania for breaking into some of americas most secure data bases. Youve hacked nasa. Youve hacked the department of defense. Youve hacked oracle. Yes, i was finding vulnerabilities in these systems just in order to prove that they are not as secure as they claim. And at the same time, to build my reputation a bit. So i could become a bit more wellknown for what i do. Reporter he was given a suspended sentence by the romanians. The u. S. Is not prosecuting him. Because he alerted the agencies and companies he hacked about their vulnerability. Hes now teamed up to start a security business cyber smart defense. I said to myself the best way to find these vulnerabilities, talk to a real hacker. Reporter the hope is more cyber vampires go legit, because theyre a threat, whether youre in the transle vainian alps or half a world away. Cynthia mcfadden, nbc news, romania. And when cynthia went to romania, she also found the notorious hacker whos in the middle of the Hillary Clinton email controversy. Shell have his first oncamera interview coming up next on the premiere of our new special series on assignment. When we come back, they call it the most exciting two minutes in sports. The quest for the next hey marc. How you feeling . Dont ask. This is what it can be like to have shingles, a painful, blistering rash. I never thought this would happen to me. If you had chickenpox, the shingles virus is already inside you. 1 in 3 people will get shingles in their lifetime. Im going to go back to the eye doctor tomorrow. Its pretty close to my eye. I dont know how you do it. Talk to your doctor or pharmacist today about a vaccine that can help prevent shingles. Try cool mint zantac. 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Test see if youre eligible for 12 months free at mybreo. Com. As an educator, its all about connections. Youre not just in the classroom; youre part of the community. You meet these tiny kids every year, and you help them learn and grow. But you also get to know their families, and over the years they become a part of your life, and you become a part of theirs. When you build those connections, you can accomplish some Pretty Amazing things. Im Jackie Kruzik and im proud to be a new jersey educator. And they were off. If you bet the favorite in last nights kentucky derby, you had some extra money to spend on mom today. Nyquist was the big winner, holding off exaggerator in the final seconds of americas longestrunning sporting event. Nyquist is trying for the triple crown now in baltimore just two weeks from now. The triple crown is an accomplishment so tough winners are celebrated long after their racing days are over. American pharoah was the first horse to win it since the 1970s and hes enjoying retirement now. But as dylan dreyer tells us, theres still big money to be made. Reporter its the simple life for the horses here at the ashford stud farm in ver sails kentucky. Its pretty neat to see him in person. Reporter unless youre royalty. This is American Pharoah. American pharoah has won the triple crown reporter hes now enjoying retirement. Hes living the good life for sure. Reporter relaxing, enjoying good meals and letting himself go a little. Gaining close to 170 pounds since leaving the racing world. There you go. Reporter and Holding Court with his adoring fans. Visitors from all over the world come to see the triple crown champ up close and personal. Do you think hes kind of changed the interest in, i guess, horse tourism . I think that he is an incredible ambassador for the sport. I think that he has a great personality. Hes a special horse. Reporter meeting American Pharoah is now the hottest ticket in town. But its not just tourists lining up. Breeders with an available mare and 200,000 are filling his dance card three times a day, betting this stud will produce more winners. Do you expect his price to go up for breeding . That wont happen for a number of years. He has to prove himself all over again when his sons and daughters hopefully winning to greatness just like he did. Coming to the finish reporter only time will tell if this stud will produce another champion. For now its all billion living the good life. Dylan dreyer, nbc news, versailles, kentucky. And when we come back, van goghs paintings brought to life. How a team of artists is putting a first of how a team of artists is putting a first of its kind film the call just came in. Shes about to arrive. And with her, a flood of potential patients. A deluge of digital records. Xrays, mris. All on account. Of penelope. But with the help of at t, and a network that scales up and down ondemand, this hospital can be ready. Giving them the agility to be flexible reliable. Because no one knows like at t. My wife and i are now participating in your mutual fund. We invested in your fund to help us pay for a College Education for our son. Weve enclosed a picture of our son so that you can get a sense there are real people out here trusting you with their hardearned money. At fidelity, we dont just manage money, we manage peoples money. But ive managed. E Crohns Disease is tough, except that managing my symptoms was all i was doing. And when i finally told my doctor, he said humira is for adults like me who have tried other medications but still experience the symptoms of moderate to severe Crohns Disease. And that in clinical studies, the majority of patients on humira saw significant symptom relief. And many achieved remission. Humira can lower your ability to fight infections, including tuberculosis. Serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. Before treatment, get tested for tb. Tell your doctor if youve been to areas where certain fungal infections are common, and if youve had tb, hepatitis b, are prone to infections, or have flulike symptoms or sores. Dont start humira if you have an infection. Ask your gastroenterologist about humira. With humira, remission is possible. Finally tonight its never been done before. A fully handpainted feature film. Now giving new life to Vincent Van Goghs work. The attention to detail so extraordinary the finished product is turning into a masterpiece in its own right. Kelly cobiella has our report. Everybody has a different story. Reporter Vincent Van Gogh like youve never seen him before. Hes a nice, quiet man. Reporter talking portraits and landscape that moves. 120 of van goghs own paintings telling his story. Heres the thins reporter filmmaker and van gogh mega fan and an International Team of artists are behind it. These paintings are iconic and everyone knows them. Theres something really interesting, and magical when they suddenly start to live. Reporter so magical the first trailer went viral. Its pretty easy these days to make a moving picture look like a painting. With computer software, like this. What theyre doing is much harder. Every single frame is handpainted. You can see the paint literally moving on the big screen. You can see the brush strokes as theyre appearing on the big screen. Its just an incredible effect. Reporter your painting comes to life on screen. Yes. Reporter what is that like. Its very impressive. Reporter its a lot of work. Actors and scenes morph into this. The artists take each frame, turn it into an oil on canvas, take a picture, then start all over again. The frame that you painted you can see the outline. Thats the next frame, and look at this. Starting all over again. It can take two weeks to create one second. The opening shot is 603 paintings. End on end theyd be as tall as the emtire state building. Great and mad and great. Reporter sort of like van gogh . Exactly. Reporter theyve been painting for more than a year and theyre only halfway there. This is the worlds first fully painted feature film. And it might possibly be the last, as well. Reporter a labor of love as unique as the man who inspired it. Kelly cobiella, nbc news, poland. So cool. Theyre hoping to have it completed in theaters worldwide by this fall. And that is nbc nightly news for this sunday night. Stay tuned for lester holt and the First Edition of our powerful new series on assignment. Im kate snow. Ill see you tomorrow on msnbc. For all of us here at nbc news, happy mothers day. Have a great night. Reporter tonight, nbc news goes on assignment. Cynthia mcfadden has the first on Camera Network interview with the man who says he hacked Hillary Clinton. Youre saying the clinton server was unprotected . Yes. Reporter who is he and can he be believed . Someone who does what he does is a congenital liar