This is nbc nightly news with lester holt. Substituting tonight, Savannah Guthrie. Good evening. As we come on the air tonight, one section of the country is bracing for a wave of Severe Weather. Another is cleaning up after a night of powerful tornadoes. It is the upper midwest under the gun tonight with the threat of heavy thunderstorms and hail. And just look at the size of this twister. One of nearly 30 reported this week through the middle of the country over the weekend. Nbcs john yang joins us from broken arrow, oklahoma. John good evening. Reporter good evening. Take a look at the damage here in broken arrow. This isnt a limb off of the tree. This is the trunk of the tree the top snapped right off. Take a look at the house across the street. One of two. The tops just peeled off and opened up like an onion. Once again Tornado Alley has lived up to its billing. Oh my goodness. You can see it clear as day. Reporter overnight, tornadoes sliced across south western oklahoma. To the east homes were damaged in broken arrow outside tulsa. The roof gone. Its chaos. It freaked us out. Shaking me. Reporter trees were uprooted and power lines down. Just before the storm hit, brad shirley had been watching his Favorite Movie twister. It was definitely really loud. The house started to rumble. Once that happened i dove into the bathroom with the mattress. Reporter he found his home siding three blocks away. Not really how i planned on spending my sunday. But at least i work at lowes so i got access to stuff. Reporter going to make good use of the discount. Absolutely. Reporter nine tornadoes in ten states from texas to minnesota. This is a violent tornado down here and sit big. Reporter another round of lightning strikes outside Oklahoma City and more hail and flooding in north texas where today the National Guard helped rescue ten people from their homes and cars. Outside Kansas City Missouri residents were evacuated when the river floodeds leaving home under watt per. The Severe Weather there postponed a Major League Soccer game. In eastern kansas Authorities Say strong winds derailed this freight train. Tonight in oklahoma a state where twisters are an annual rite of spring, residents are cleaning up. Are you hoping this is it . Yeah but oklahoma once you lived here 31 years, this is not it. Reporter as the storm moves east it is weakening sob the chances of Severe Weather for at least the next few days is relatively low. Good news for them. Thank you. We are following a latebreaking story out of waco texas tonight. Nine people are dead and 18 injured following a confrontation between rival biker gangs. Police have now secured that scene but theyre asking people to avoid the area. Now to washington, d. C. Where police are hoping this piece of Surveillance Video will help them break open a bizarre multiple murder case. It happened in one of the most welltodo neighborhoods in the city. A couple their young son and their housekeeper killed their house set on fire their sports car missing. And tonight police are zeroing in on the socalled person of interest. Nbcs Kristen Welker with our report. Authorities say the man in this Surveillance Video is a person of interest in the fire that ravaged this home in washington last thursday. Four bodies were recover, two confirmed to be 46yearold savvas salve op po los and his wife and son. It takes a viciousness to kill four people including a 10yearold boy. Police spotted the man on a Surveillance Video after discovering the familys porsche 15 miles away. A person could recognize a person from their gait. The fire was set intentionally. We can say that there were at least on three of the four victims there were injuries discovered appeared to be blunt force or sharp object injuries. Adding to the mystery, a housekeeper told police amy texted her before work telling her not to come. Savvas was active in the community. Their son attended a private academy in washington. Two daughters were away at boarding school. The home is four blocks from where the Vice President lives and near a house owned by Hillary Clinton and bill. Recently spotted on a jog nearby. Neighbors are rattled. Im shocked and horrified that Something Like this could happen. A mystery thats gripped the Nations Capital capital. Overseas now where it is being reported tonight that isis militants have won control of a key city in iraq ramadi. A senior official says that 90 of that town is under isis control but the pentagon puts it a bit differently tonight saying the situation there remains quote fluid and contested. Back in this country, ak track is working overtime to get the busy northeast corridor back up and running. Starting tomorrow service will resume between philadelphia and new york. But is the investigation any closer to providing answers tonight . Nbcs tom costello is in philadelphia for us once again. Tom, good evening to you. Reporter first train leaves at 5 53 tomorrow. Amtrak has been working round the clock to restart the service on this kate call northeast corridor. Five days since amtrak went off the rails, repair crews have finished the job of rebuilding the track. Investigators are focusing on the chain of events that might have caused such a horrific accident and the ntsb says nothing has been ruled in or out. Were looking at the human, the machine and the environment. And all three of those things are still on the table. The human is engineer Brandon Bostian who told investigators he doesnt remember what happened jus before his speeding train crashed. The environment question includes whether projectiles hit the train just before the accident. The ntsb snow says engineer bostian never radioed that he had been hit. The fbi is looking at the smash mark on three trains. Amtrak says its trains are hit by projectiles all of the time. Theres no shortage of rocks or concrete and a low fence line making it easy for somebody who might want to take aim at a train. Residents say its a common sport for local kids. Big rocks, balls, ice, snowballsing with anything you can think of to throw, its been throw. Reporter its not a new problem. The the New York Times carried a story in 1905 of ted ki roosevelts train being hit on the same stretch of track. The question, if amtrak 188 was hit, did that distract engineer bostian who was new to if route just as he should have been slowing to 50, not speeding up . Meanwhile at the crash scene this afternoon, a moment of reflection for the eight people who died and the 200 who were injured on tuesday night. Also eight doves for the eight people who died. 20 people remain hospitalized. All expected to survive. Now to president ial politics and yet another major candidate under scrutiny after struggling with questions about the war in iraq. It is not the way senator marco rubio hoped to make headlines in a weekend where all of the contenders were trying to stand out. Nbcs senior White House CorrespondentChris Jansing with our report. Today it was marco rubios turn to get tripped up. Was it a mistake to go to war with iraq . It was not a mistake given he was the president. After jeb bush spent the week stumbling over questions on the war, today marco rubio found himself doing the same. It was not a mistake for the president to decide to go into iraq. Im asking you in hindsight. The world is a better place because Saddam Hussein is not there. A blunder on a weekend that was supposed be about republican unity at the dinner in iowa. We can beat hillary hillary, we must beat hillary, we will beat hillary if she ever takes niz questions. Someone needs to ask her. The scene firing up debate to defeat Hillary Clinton. Have some ice cream. From rick perry to scott walker 11 president ial hopefuls 1300 republican activists in iowa with republican chatter to root beer float. Donald trump was peddling a photo op with donald. Each candidate got 10 minutes to sell themselves and their plan for victory in 2016. But Hillary Clinton beats all of them in headtohead match jups. I think republicans have been disappointed that some of the stumbles that Hillary Clinton has encounted do not seem to have wounded her. But republicans believe that cumulative attacks will whittle away her strength. If theres many more scandals that come up even the democrats are going to sour on that. Serving up some Wishful Thinking or the recipe for a win. Chris jansing, nbc news des moines, iowa. There is a new study tonight. It suthss that some of the kids suffering from as ma may also have an allergy to peanuts. Im joining by dr. Natalie azar. Theup shot here some kids who have asthma should get a peanut check. Yes. If your child is being treated for asthma and youre having a hard time getting control of these symptoms an undiagnosed peanut allergy may be a factor. When researchers at mercy Childrens Hospital in three do ohio looked at the medical records of 1500 children diagnosed with asthma they found that 11 of these children also had a peanut allergy. In that entire group, 44 had a blood test to see if they were sensitive to peanuts. And of those children, almost a quarter tested positive. Many of these families roughly 50 never suspected their children had a peanut allergy at all. Who should be test snd. Kids that have acute exacerbations without an obvious trigger and also children who are doing well on their medicine but cant to have attacks. A lot of these inhaled medicines for asthma also contain soy. Some children can cross react with that. Thank you. Well nightly news continues on this sunday would you believe it is a great time to be a frequent flyer . A change in the airlines that could have you planning the next trip. And my constipation and belly pain feel like a raging storm. Ive tried laxatives but my symptoms keep returning. My constipation feels like a heavy weight that keeps coming back. Vo linzess can help. Oncedaily linzess treats adults with ibs with constipation or chronic constipation. Linzess is thought to help calm painsensing nerves and accelerate bowel movements. Linzess helps you proactively manage your symptoms. 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. Bottom line, ask your doctor about linzess today. Making a fist something we do to show resolve. To defend ourselves. To declare victory. So cvs Health Provides expert support and vital medicines. At our Infusion Centers or in patients homes. We help them fight the good fight. Cvs health, because health is everything. The Airline Industry often gets a bad rap things to everything from cramped seats to lost luggage. But now some of the nations Biggest Airlines are giving frequent flyers a reason to smile. Good news for frequent flyers. Believe it or not, its getting easier to use the hard earned miles and points. The daesh family is back in oregon after taking a vacation in italy and spain using their reward miles. We saved about using reward miles on this last trip. For three seats the dyers used 80,000 miles. Ideaworks looked at 25 Airlines Worldwide and found that 74 of the flights they checked had seats open for reward reservations the highest level in six years. What im especially surprised by is the fact that were seeing more and more reward about closer to departure. The three largest u. S. Airlines united american and delta all increased their reward seats this year. Why offering more seats . They eesh competing with credit card companies. To arms want customers to become loyal to their frequent flyer program. I typically go to california two times, three times a year on reward miles. You need a lot of miles to get a fre ticket. But not all points are equal. Experts say read the fine print. Some award travel based upon how far you fly. Some award travel based on what you spend. Think globally. Sometimes youll find theres more availability on International Carriers even for travel in the u. S. A trip that could be 25,000 miles round trip with american, you might be able to get those same flights for 9,000 miles. If youre flexible fly on a tuesday or wednesday. Experts say youll find its easier to get a seat to just about anywhere. Thats what were focused on looking for, seeing whats available in the latter part of the summer for southeast asia. The dyers are already planning their next adventure. Nbc news new york. And still ahead, one mans mission to bring the c at chase, we celebrate Small Businesses every day through programs like mission main street grants. Last years grant recipients are achieving amazing things. Carving a name for myself and creating local jobs. Creating more programs for these little bookworms. Bringing a taste of louisiana to the world. At chase, were proud to support our grant recipients and Small Businesses like yours. So you can take the next big step. Test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test. You may have seen ads with some hollywood stars sporting funny red noses and its all for a good cause. Matt lauer is trying to raise awareness by setting out on a 226mile journey. This morning he started the bike ride from boston to new york and it will raise money for red nose day which will benefit children in poverty. This is americas first red nose day. But in britain its a popular day of giving for decades. We hope to see matt ride into our home base at 30 rock live on the today show. For members of the military, the job often means deployments away from family and friends. But thanks to operation troop aid Service Members are getting a taste of home even if theyre miles away. Heres lester holt. On any given weekend this retired navy veteran is rolling into town for a good cause. Weve had a farm aid, a gulf aid, a katrina aid, a sandy aid. Me being 21 years military retired its that as we a nation stand up. Mark woods created troop aid, its mission to bring the comforts of home to military personnel deployed around the world. Phone cards, cookies candy. To date theyve blifrd 7 million in care packages over the last decade. One of the biggest reasons im doing that to get the word out that hey, we still have military deployed all over the world. Earlier this month operation troop aid was in worth partnering with the Chris Kyle Foundation to raise awareness for veterans. Letting our troops, boots on the ground know that people here still care. It seems like a win win for chris kiles family who has become advocates in honor of their son. We want to make chris proud. And i think right now hes smiling down on us. We would like our country to take note of what our young men and women in uniform go through both abroad and at home honor them give back to them. Do Little Things just to thank them. They are going to love it. Dozens showed their support by assembling some 100 kash packages that were immediately shipped out to afghanistan. Everything is important for these guys. Payback for all of the service that theyve done for us. I love giving back to our veterans. As veterans like chris kyles brother jeff sees it, this simple gesture goes a long way in a war zone. To get a little piece of home and know that the American People are still behind us it gives us the strength to fight another day. One veterans efforts to pay it guard one package at a time. Lester holt nbc news. Coming up next a young woman whose obstacles you cant you do all this research on the perfect car. Gas mileage , horse power. Torque ratios. 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So i asked about adding oncedaily namenda xr to his Current Treatment for moderate to severe alzheimers. It works differently. When added to another alzheimers treatment, it may improve overall function and cognition. And may slow the worsening of symptoms for a while. Vo namenda xr doesnt change how the disease progresses. It shouldnt be taken by anyone allergic to memantine, or whos had a bad reaction to namenda xr or its ingredients. Before starting treatment, tell their doctor if they have or ever had, a seizure disorder, difficulty passing urine liver, kidney or bladder problems, and about medications theyre taking. Certain medications, changes in diet, or medical conditions may affect the amount of namenda xr in the body and may increase side effects. The most common side effects are headache, diarrhea and dizziness. All my life, hes protected me. Now i am giving back. Ask their doctor about oncedaily namenda xr and learn about a free trial offer at namendaxr. Com. We are ending on a high note tonight. Jazz musicians are known for their ability to improvise. But one young singer is doing that and then some. Shes proof that you dont need to hear the music to hit all the right notes. Nbcs erica hill caught up with her at a performance in florida. Each night on stage is a dream come through for mandy harvey. Its who i am. Ive always been a musician. And the blood, the sweat, the tears, i love every moment of it. Her connection with the audience is undeniable. [ applause ] but for nearly a decade this 27yearold hasnt heard any of the applause. Or even the music. After battling gradual hearing loss throughout her childhood, mandys worst fierce were realized as a College Freshman when the music stopped. I broke. And i remember thinking well what do i do now . What was it like for you in those moments . Like i died. I watched myself die. It took a year for mandy to even think about singing again. But eventually with encouragement from her dad, she tried. Mandys pitch was perfect. Her voice had never left her. It was that awareness of yeah yeah that worked. That opened up a door for me and from there i kind of hit the ground running. Eight years of losing her hearing, mandy has released three albums with two more on the way. You give me chills. Its been wonderful. Much of her audience has no idea she is deaf. Jazz is such an improvisation nal u style of music. If you cant hear whats happening, how do you do that . Its a lot of faith and a lot of visual contact with the other musicians. Mandy feels the tempo through the floor, reads lips and relies on the muscle memory of her brain and technology to find her note. And while she knows her story is a source of inspiration, she doesnt want it to define her. I dont see myself as the deaf jazz singer. To me im just a singer. And i have certain hurdles and im overcoming them. Hurdles that have made her stronger and more determines to share the music inside her. Erica hill nbc news kissimmee, florida. Now extraordinary. That is nbc nightly news for this sunday. Im Savannah Guthrie reporting from new york. Ill see you bright and early tomorrow morning on today. From all of us here on nbc news, have a great night. She was smart. Hi mom. I cant even tell you how much i loved her. I cant even describe the love. She walked out her front door, and was never seen again. This woman had gone out to get the mail and disappeared in her pajamas. We might have a crime scene here. Was there somebody crazy on the loose abducting people . I think the hair on the back of my neck stood up. A crime right out of the movies. Oh my gosh, did this really happen . A baseball cap, a hoodie with