Cancer. Brad and angelinea, a rare interview together opening up to tom brokaw about her health scare and how they are doing now. Nightly news begins right now. Good evening. We wrapped up a pair of interviews with president obama here in newark a short time ago and well have our exclusive conversation shortly. But we do want to start with a deeply troubling mystery of a packed commercial airline that we know broke up in flight. It killed all 224 people on board. The russian airbus filled with vacationers went down on saturday over the sinai desert avoided tonight by many other airlines. There is no evidence of terrorism, data gathered by u. S. Intelligence satellite is raising new concerns. Our coverage begins with bill neely in cairo. Reporter the wreckage tells a story. Of a plane that broke apart in midair, scattered so far a satellite was used to find debris. Each piece, a clue in this mystery. Investigators worked on the two flight extracting information but releasing none. The airline metro jet claims a technical fault couldnt have caused the crash, blaming an external impact. Russian officials insist that isnt based on fact. One fact we know is that the doomed plane was involved in a previous accident. Its tail hitting the ground, landing here in cairo, 14 years ago. And nobody is ruling out terrorism. Isis, which operates in the area, claims it downed the plane. Egypt and russia discounting that, the u. S. Is not. We dont have any direct evidence of any terrorist involvement yet. Reporter the bodies of nearly 200 people are back in russia now. Among the dead, the sheen family, pictured leaving for egypt. And the youngest victim, 10monthold doreena, waiting to go home, lost in a disaster, still to be explained. Bill neely, nbc news, cairo. This is tom costello with a tail of the plane found several miles from the rest of the wreckage, the evidence of what went wrong would be found in explosive residue or a hairline facture in the fuselage. The airbus a321 was 18 years old with 56,000 flight hours it should be considered mid aged. But there was the 2001 tail strike in cairo. And they will look at the plane. Each time a plane takes off or lands the skin of the aircraft contracts and expands. If a crack develops the results can be catastrophic. After many cycles, ups and downs, the crashes reach a critical point and break open. It happened before in 1985, a Japan Airlines 747 came apart in flight killing 520 people. A faulty repair performed seven years earlier was blamed. 1988, the top of a Aloha Airline flight killed a Flight Attendant killed out of the plane. Blamed. And in 202, 225 people were killed from a China Airlines 747 disintegrated in mid air. They blamed the faulty repair made 22 years earlier. Spotty metal fatigue can be challenging. It could be covered up by dirt, oil and grime and not visible to the naked eye during an inspection. And there is the Late Development tonight. Tonight a Senior Defense official tells nbc news that an American Infrared satellite detected a heat flash at the same time over the sinai where the plane crashed crashed. U. S. Analysts believe it could be an explosion on the aircraft itself. Either a fuel tank or a bomb. But there is no indication that a service to air missile brought down this plane. Lester. Tom costello tonight, thank you. Now to the results of the brand new nbc news wall street journal poll showing ben carson out in front in a major way. He has surged to 29 . The highest for any republican candidate so far in our polls. Carson is also the first candidate to have a combined 50 of Republican Voters say he is either the first or second choice. Our Hallie Jackson takes a look as carson seems to be solidifying his place as frontrunner. Reporter received like a rock star, today in florida. One of the kawhiest candidates, ben carson, greeted firedup fans. [ singing ] i continue to do what ive been doing and that is to tell the truth and talk about the issues that are important to the people. Reporter carson now the first or second choice for fully half of the people we polled. The new republican frontrunner also at the front of a fight to shakeup gop debates. His advisers part of a huddle of campaigns ub happy with the last debate. On stage all adversaries but around the table accompliced angry and looking for these demands. 30 seconds for opening and closing statements. Control over on screen graphic and no lightning rounds and Room Temperature below 67. No sweat for them. But there is the heat as the campaigns cut out Party Leaders to deal directly with tv networks. This is similar to what the campaigns did in the previous two cycles. To hell with the press. But now a curveball with trump negotiating separate negotiations himself. What you are seeing is the conservative and the outsider wing has taken charge of the energy of the part. And this reshaped by antiestablishment forces, jeb bush stuck at 8 in the poll is trying to find new footing with the reboot. And the new slogan and embraced by this energized crowd, looking for a fighter and finding one. Bush, taking a dig at his former prot edgy marco rubio. The challenges we face as a nation are too great to roll the dice on another president ial experiment. Both looking ahead to the next showdown eight days away. Who will come out on top, still up for debate. One bush aide warned on twitter today, comebacks tame time and polls dont change overnight. Lester. Hallie, thanks. A big Health Square for chipolte which has shut down dozens of restaurants amid news of an e. Coli outbreak. People sickened and hospitalized after eating at the restaurant. And investors are worning there could be a spike in cases. Miguel almaguer with late details. Reporter the e. Coli outbreak linked to chipolte, the popular chain that promoted the mexican food made from fresh, healthy ingredients has hospitalized at least eight people with 22 reported sick in Washington State and oregon, a number expected to rise. The day i went to the e. R. Is when i started to feel it. Ashley became violently ill three days after she ate at this portland air i was terrified that i was going to go up. The very young and the elderly have the most vulnerable to coli. With no cause for the outbreak identified, chipolte says up to eight of the kitchens may be connected to the contamination. Over the weekend, chipolte voluntarily shut down every location, 43 of them in Washington State and the portland, we immediately closed all of our restaurants in the area ought of an abundance of caution, even though the vast majority of the restaurants have no reported problems. Tonight Health Officials are talking to patients and testing ingredients. The food product at chipolte may be the source of their infection. We could potentially have more severe cases. Reporter Health Officials warn other restaurants and distributors could also be effected. Tonight chipolte is working with state Health Departments and federal investigators to pinpoint the ingredient as the popular chain is states. On wednesday Health Officials hope to know the exact source and strain of the e. Coli outbreak. By then they will have an updated number of people who have been effected by the illness. Lester. Miguel, thank you. Late today, at least a dozen cars slided in a giant pileup in a massive dust storm known as a haboob wiped out visibility in highway south of bakersfield, california. Five people were injured . And the southeast has a potential tornado outbreak from a danger thunderstorm system. In the atlanta area relentless rain has caused widespread flooding stranding drivers on the roadways. Now to our exclusive interview with president obama. The president s push for sweeping criminal Justice Reform brought in here to newark, this afternoon. Where he met with clients at an Addiction Recovery house. The president who has been calling for reduced prison sentences and diversion programs for nonviolent drug offenders visited integrity house to highlight their work in helping formerly jailed offenders reenter society. Criminal Justice Reform enjoys rare bipartisan support in washington. After his visit he sat down with me to talk about what is at stake. You take out the underpinning of justice which is deterrent when you say no jail or diversion or shorter sentences. Are you afraid it could send the wrong actually, nobody is talking about no jail in all circumstances. The question is just how do we go through the various levels of the criminal Justice System and tailer it so we are getting the best results which is safe streets and a reduce incarceration that results in us as a society spending 80 billion a year. Necessary. If you have violent criminals out there, they need to be taken off the streets. Nobody is invested than i am in toward reduced crime. Almost every time you speak about criminal Justice Reform you ultimately note that the system is unfair to black and hispanic boys and men. And i wonder if you could explain a bit more specifically. You talking about the point of arrest, the interactions with police or within the course system . Pretty much up and see is disparities in how white, black, hispanic suspects are treated. Higher arrest rates, tougher sentencing, longer sentences. Where it is happening, you cant always isolate within the system. There may be several biases that take place. There may be predispositions that end up resulting in these disparities but we know they are happening. Your own fbi director has raised this idea, the ferguson effect, that Police Officers may le laying back a bit, they dont want to end up on somebodys cam corder and as a result were seeing a spike in homicides in some cities. Do you fear that could undermind or derail what you are trying to do right now. What is absolutely true is that weve seen some spikes in cities. Over all, the Violent Crime rate is still near the historic lows. Weve seen a spike in some cities this year but it is still close to the historic lows. But is it something that you think that Police Officers are feeling. We have not seen any evidence of that. And i think the fbi director would be the first to say that hes heard anecdotal suggestions that may be happening on selective sites but we dont know. So many hopes and aspirations were placed on you as the president. As you approach this area of criminal Justice Reform, is this in your mind your defining moment, that would seal the legacy of what we would africanamerican president . You know, this is something that is important to me. You know, one of the things that ive consistently said, as president , is that im the president of all people. I am very proud that my presidency can help to galvanize and mobilize america on behalf of issues of Racial Disparity and racial justice. We have heard last friday when the decision was announced to put a small number of u. S. Operation forces on the ground in northern syria. Many will look at that and say youve broken your promise about boots on ground. Have you in . Well keep in mind we have run special ops already. And this is just an extension of what we are continuing to do. We are not putting u. S. Troops on front lines fighting fire fights with isil. Ive been consistent throughout that we are not going to be fighting like we did in iraq with a battalions and occupations. That doesnt solve the problem. Tomorrow night part two of our interview with the president. A year out from the election of his replacement, our conversation about the 2016 race and what he thought about republican reaction to last weeks debate on cnbc. Coming up tomorrow here on nightly news. Still ahead, digital babysitters. An astounding look at mobile devices, now many children already use them, before they are even out of the crib. What the parents of the the future belongs to the fast. And to help you accelerate, weve created a new company. One totally focused on whats next for your business. The True Partnership where people,technology and ideas push everyone forward. Accelerating innovation. Accelerating transformation. Accelerating next. When my doctor told me i have agerelated macular degeneration, amd we came up with a plan to help reduce my risk of progression. And everywhere i look. Im reminded to stick to my plan. Including Preservision Areds 2. My doctor said Preservision Areds 2 has the exact nutrient formula Eye Institute recommends to help reduce the risk of progression of moderate to advanced amd. After 15 years of clinical studies. Preservision areds 2. Because my eyes are everything. Look at you, saving money on your Medicare Part d prescriptions. At walgreens, we call that carpe med diem. Thats almost latin for seize the day to get more out of life and Medicare Part d. From onedollar copays on select plans. To now reward points on all prescriptions, walgreens has you covered. So drop by and seize the savings walgreens. At the corner of happy and healthy. There is no devices have revolutionized the way we live. But the children coming into this Digital World will never know a time without them. Our Stephanie Gosk looks at a new study how technology is radically changing childhood. Reporter as a society, we are sucked into our digital devices. Adults, teenagers, and now even babies. When the journal of pediatrics looked at a small sample of low income parents in philadelphia, it found nearly half of children less than a year old use a mobile device every day. By the age of two, that percentage jumps up to nearly 80 . The parents in the study relied heavily on digital distraction while doing housework, in public, and at bed time. Children adopted these devices early on. They use them frequently. And by age four, most of them owned their own personal device. Reporter recent Research Suggests the nationwide as well. You are in a restaurant and shes crying and you are just trying to eat, what do you do . That is exactly when i take it out. And she actually eats if she is watching it. Reporter the reality is that smartphones and tablets are now nearly unavoidable. But the American Academy of pediatrics does recommend moderation. Discourage screen time in children under two. Set limits. Dont use technology to calm toddlers. And if you do download apps, choose widely. There are 80,000 advertised as educational. But no matter how good the content, pediatricians say Healthy Child Development requires facetoface time and free play. So dont forget to unplug, power down, and let them entertain themselves. Stephanie gosk, nbc news, new york. Were back in a moment with a mystery. A massive crack opening in the earth and a warning to glad i could help you plan for your retirement. Alright, kelly and promise me that youll try that taco place on south street. And we have portfolio planning tools to help you manage your ira. Yeah, youre old 401k give me your phone. The rollover consultants give you stepbystep help. No setup fees. Use your potion. Sorry, not you. My pleasure. Goodnight, tim. For all the confidence you need. Whos tim . Td ameritrade. 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It lands up right which could help crews in the search for the black box. In wyoming, a giant crack is opening in a hillside. It is longer than 7 football fields, 150 feet wide and growing. Why this is happening is not clear but it is believed that a landslide caused it after a rainy spring. Experts say folks should keep their distance. And an incredible sight caught on dash cam in bangkok. Cars on highway at night when suddenly night turned into day as a huge fire ball streaks across the sky. They believe it was a meteor putting on a show for everyone there. When we come ba