Unpredictable leader. Richard engel reports. Reporter they lined up in pyongyang for the surprise announcement. The news anchor telling them that north korea successfully detonated a hydrogen bomb. Everyone cheered. A few on cue, were moved to tears. The United States is waiting to invade our country so having a ride row jen bomb is the right thing, said this man. In sock, the blast felt like a 1. 5 earthquake. The tremors reached china 60 miles away. Japan scrambled jets to test the air. Japan Caroline Kennedy called the blast a playoffo case. Kim jongun signed the order just a few days before his 33 birthday. North korea set off an atomic bomb three times. But was todays blast really something far dangerous . The white house seems to doubt it. The initial analysis that has been conducted of the events reported overnight is not consistent with north korea claims of a bomb. Reporter but north korea certainly isnt sitting still. Constantly to build the most modern survivable and Lethal Nuclear Weapons force that they can. And so even if they were not a hydrogen device, that is intention. Reporter and it is proving hard to contain. Extensive anxiouses are already in place. There are still 28,000 u. S. Troops stationed in south korea. But north koreas Standing Army is a million strong and the country is working on improving missiles, like the ones we saw paraded through pong pyongyang in 2012. The worry is that as north korea Nuclear Weapons get more advanced they could be launched in warheads. Kim jongun, some say, seeking attention, the world today, reminding everyone he rules a nuclear power. A senior u. S. Military official told nbc News Washington was aware of north korea test preparations for two weeks and even sent drones to collect air samples from near the test site. But as of tonight it is still unclear exactly what kind of Nuclear Device was detonated. Lester. Richard engel, thank you. And back in this country now, senator ted cruz is firing back after rival republican donald trumppossed questions into the mix over whether hes actually eligible to be president. Donald trump raised the socalled birther argument about cruz just as he did with president obama, trying to sew seeds of doubt about cruz who happens to be leading trump in iowa. Which is where we here from hallie jackson. Reporter the birtherrreborn. Donald trump insinuating ted cruz is not eligible for the white house everybody is talking about it now that he is doing better. I could seek a declaratory judgment if i was ted. What does that mean . You go to court. Which court . Federal court to ask for a declaratory judgment. Reporter cruz, leading trump in iowa, laughed off the attack with a tweet feezuring fonzi, now turning more serious. people will continue to make political noise about it but as a legal matter it is quite straightforward. He was born in calgary and his mom was born in delaware. An american citizen. Making cruz one. It requires the president be natural born. The constitution doesnt define natural born. But most agree it means citizen by birth and that would include ted cruz. Here is trump himself in september. I hear it was checked out by every attorney every which way and i understand ted is in fine shape. He is testing the temperature of his supporters who also higher with potential donald trump voters than any other republican. But trump is getting the green light from influential radio hosts. Have at it, boys. Ted cruz is very disciplined in not getting into the personal attacks of a campaign. Instead, hes been drawing policy distinctions with his opponents and it has worked for him. Reporter like pointing out donald trump would allow some to apply for legal citizenship, something he opposed. I will talk about my report. Voters could assess Donald Trumps record. What is important to draw extinctions for them. They are making a determination who has the experience. Who has the knowledge. Reporter the candidates have stayed strategically friendly but tonight donald trump is amping up attacks against immigration. If there is a full on fight, it might be on that more than than eligibility. Birther attacks have been around since the politics or donald trump. Hallie jackson, thank you. A new crisis for the restaurant chain chipolte after recent scares over ecoli. Norovirus has sickened customers and damaged the bottom line. The Company Revealed today it is the target of a criminal investigation in the very first foodborne illness outbreaks in a restaurant in california last summer. Tom costello on what customers should know. Reporter the news tonight, the denverbased chipolte mexican food chain under grand jury subpoena to turn over internal documents. Part of a fda criminal investigation into the events at this restaurant in simi valley, california, last summer where a noro Virus Outbreak sickened 18 employees and then spread to 189 customers who ate there. This is the receipt. Reporter among them Cindy Vasquez and her sister. She felt horrible. We were going to the bathroom. Had bad chilly. Reporter this attorney represents 24 of the customers who became ill. Noro virus doesnt require hospitalization. But in this instance, there were several people who i represent who were hospitalized zplnk the fda and u. S. Attorneys office will not say what potential criminal matter the grand jury is investigating. Most norovirus cases begin when someone who is sick fails to practice good hygiene. The virus could spread fast. But with 207 total people sickened, simi valley was only the start of chipoltes problems. From october through november at least 58 people sickened across 12 states with various ecoli bacteria linked to products. Then in december, 141 students sickened again with the noro virus linked to a chipolte near boston college. First i have to say, im sorry for the people who got sick. Reporter last month, the ceo told matt lauer hes implementing new food safety steps. Practices that are so far above industry norms today, well be the safest place to and that is our commitment. Today they did not kmenlt on the grand jury investigation but did say december sales are down 30 . The stock falling to a twoyear low. Down 5 today but down 43 since october. Lester. Tom, thanks. Soaking rains fueled by el nino are hammering much of california for a second day. It is triggering a whole new set of problems as millions face the threat of flooding and mudslides. Nbc News National correspondent Miguel Almaguer has the latest. Reporter on one of southern californias busiest freeways, i5, better luck with a boat than a car today. It is not just the rain coming down, the earth is giving way. Hills are eroding, threatening to bury homes and highways. Communities recently scorched by wildfires, mud. We worry. Of preparation. There is a whole bunch of sandbags around the house. Reporter tonight 19 million along the trees are down. The surf is up. Storm drains are gushing. The warm waters from el nino helping to fuel a parade of storms. One after another, moving east. It helped trigger the deadly flooding in the midwest. New images along the Mississippi River before and after some 150 homes destroyed. For many in california, it is too much, too soon. Whipping winds have peeled back roofs. It ripped of roof off of three commercial structures and damaged five others. Reporter in san diego, 911 is swamped. Were getting inundated and our center is taking on heavy volume of calls. Reporter rescues, flooding, kayaking down the street. In northern california, they are expecting 15 inches in 16 days. In the mountains, a whiteout. Two feet of snow. Make sure you have a full tank of gas in case you get stranded. Extra blankets, extra you never know. Reporter now tonight, more snow, rain and flooding is on the way. With a Tornado Warning in san diego, and heavy rain here in los angeles, the goal has always been to protect communities downhill. This area was built, this debris basin because this area is prone to mudslides. The mud is already several feet deep but the big question is over the next several days, could it hold back all of the mud from hitting the Communities Just on the other side of us. Lester. Miguel almaguer, thank you. Even as he faces charges of Sexual Assault in pennsylvania, tonight california have declined to file charges against bill cosby over allegations he sexually assaulted a woman at the playboy mansion in 2008. They cited the statute of limitations and insufficient evidence. Cosby has been accused by dozens of women, though he maintains his innocence and denied all allegations into a texas state trooper is indicted for perjury for his of sandra bland. A dash cam caught the confrontation between the trooper and sandra bland in july. Bland was charged with assault and later found hanged in her jail cell. Suicide. But her family has filed a wrongful death suit. The turn to a growing crisis in flint, michigan, over the citys water supply. Contaminated by toxic levels of lead, poisoning children in the community. Tomorrow the governor and the mayor will meet to discuss the new state of emergency imposed months after dangerously high levels of lead were found. Nbcs Stephanie Gosk has new information suggesting Health Officials could have responded more quickly to peoples fears and avert this crisis. Reporter everyone who drank the water, an entire u. S. City, is at risk. It is just crazy. Reporter the most vulnerable in flint are children like ape rells, 1yearold kevin has double the level of lead considered acceptable. I cant do nothing to buy bottle of water with money i dont have. Reporter a Water Quality expert tells nbc news that 100 a day was all it would have taken to avoid the crisis. The river has a high salt content so it corroded the pipes it flows through and that leaked into the system. Treatment from the beginning could have collected much of the corrected much of the problem. But city officials never did it. The problem began in april of 2014 when they switched from the detroit water supply to save money. In february tests showed alarming levels of lead at a home in the city. And other people worried they were at risk too. Nbc news obtained an email from july. The governors former chief of staff wrote to Health Officials. These folks are scaried and worried about Health Impacts and basically getting blown off by us. There were assurances internally that all was fun and that is what the public was being told too. Anyone who is concerned about the could relax. This pediatrician did not relax. She launched an independent study and discovered that lead levels in children had doubled since the water switch and in some areas of town the levels tripled. In five years they will have problems. Reporter state and local leaders questioned her science publicly. But would later apologize. Just before the water was switched back to a detroit source in october. Lead levels are still high. And grandmother Jackie Pemberton doesnt want to wait for the fix. She wants to move out. Do you miss your bath . Reporter but like most families in this struggling post industrial town, there are little options. Who would want to buy our home. The problem for the water is just temporary temporary, the problem to the children will last a lifetime. Stephanie gosk, nbc news. The only Person Associated with the San Bernardino terror nongaap. Enrique marquez has pled not guilty to buying the arms. Marquez is a former neighbor and a friend of farooks. Still ahead. Take a close look. Who is she . The mysterious woman the fbi is after for a series of daring jewelry heists across five states. Well tell you what the fbi is telling us this evening. So fast. A big milestone in a my Opioid Pain Medication leaves me feeling locked up millions of people are estimated to suffer from opioidinduced constipation, oic, caused by the opioids they use to manage chronic pain. Really . Yes. Oic is a different type of constipation. Opioids block pain signals, but they can also block activity in the bowel. Its been a real struggle to find relief. You ready to paint a different picture . Yeah talk to your doctor about oic and prescription treatment options. Im on it suddenly, youre a mouthbreather. 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Stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. Ask your doctor. About viagra. The fbi is on the hunt for a brazen jewelry robber whose crime spree is growing, now spanning five states. The suspect, a woman. Who is not trying very hard to hide her identity. Nbcs Gabe Guiterrez on how police are trying to catch her before she strikes again. Reporter if there is such a thing as a typical jewelry thief, she isnt it. They have a lone female go in is area. This is the woman who has stumped the fbi and police. Brazen jewelry heist, mostly at outlet malls in full view of surveillance cameras. The latest, this week at a jareds in mebane, north carolina. She wears gloves to conceal fingerprints but no mask. Her face is exposed. And so that is very unusual to be that bold and to think that youre going to keep getting away with it. Reporter police the describe the woman as 58, 130 pounds and in the late 20s or investigators say she hit up jashlg, florida, tennessee, and north carolina. So far a crime spree totaling more than 4 million. I believe this is a part of a larger organization. They are taking items and sending them to whether it be new york city or one of the largest cities in the United States. Reporter the fbi said she holds up employees using a gun from her handbag and forcing them into a back room and zip tieing them before taking keys and cleaning out. She often cases the stores beforehand asking about the items she later steals. Police are also looking for this man, believed to be an accomplice, who she at times communicated with through an ear piece. Put on a show for the camera. Hopefully that will lead to them getting caught. Reporter tonight Jewelry Stores throughout the south are on alert and offering a reward for his capture. Gabe guiterrez, nbc news. 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The bottom line of this economy is that it is rigged. What this campaign is about is to demand that we create an economy that works for all of us rather than a handful of billionaires. If you work 40 hours a week in america, you should not live in poverty. They are trooper sound bound. A latest announcement revealing the Baseball Hall of fame. And outfielder ken griffey jr. Will be inducted with the highest voting percentage ever, 3 . Also earning a place in the call, catcher mike piazza. But barry bonds and Roger Clemens and mark mcgwire fail to get enough votes. The force is strong. In fact the strongest it has ever been after just three weeks in theaters, star wars the force awakens is the now champ with an astonished 758 million in ticket sales by the end of tuesday. Disney said it would pass the avatar 760 million at some point today and showing no signs of slowing down any time soon. And it feels like just yesterday he was born. But look who is the third in line to the british thrown started his first day of Nursery School today. Mom and dad, the duke and duchess of cambridge sharing adorable snaps of Prince George all bundled up and wearing a light blue backpack nearly as big as he is. When we come back, the fever is building with one of the biggest jackpots in history up for grabs tonight. 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. You got this. This is brad. His day of coaching begins with knee pain, when. Hey brad, wanna trade the all day relief of two aleve for six tylenol . Theres no catch. 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Millions of americans have come down with a serious case of lotto fever. 500 million tonights powerball jackpot. One of the biggest ever. And that has a lot of people dreaming big. Including our own kerry sanders. Zwrrvelgts there is no shortage of dreamers tonight. In california, long lines for the very long odds of winning. One in 292, 201, 338. You have a better crushed by an asteroid and becoming president of the United States, being canonized by the pope. The odds are crazy, but you might hit it and that is all that reporter at one point today powerball was selling 1300 tickets a second. Billboards couldnt keep up with the jackpot. 500 million. This is going to be great. You havent won anything. I havent won anything yet. But im so happy because im going to win. Reporter if a Single Person takes the lump sum winnings after federal taxes the total take home is 229 million. Most states would then take a cut, taxing the winnerings at winnings as income. Got to give it away to charity. Got to give it away to get it back. You could get 5 million venty lawsuit as from starbucks. 800 astin martins. 353 gulf stream g150s. Now if you were the sole winner and you decided to donate all of your money to washington, the jackpot would fund the federal government for slightly more than an kerry sanders, nbc news, miami. So you are thinking if no one wins tonight, what happens. The powerball will 675 million. That would be a new record. It for us on this wednesday night. Im lester holt. News, thank you for watching and good night. Guardsmen are returning home from their mission to help flood victims in missouri. Plus the big caucus day in iowa is less than a month away and the race for the Party Nominations is heating up. And an eastern Iowa Fire Department spends the day youre watching kwwl, weve got you covered. This is the news at six. Good evening everyone, im ron steele. And im amanda goodman. Thanks for joining us. Coming to eastern iowa. Lets go to storm track seven chief now for your first forecast. From the kwwl stormtrack 7 weather team. See the screen for your complete weather information. Here is additional forecast are tracking scattered light snow 1 or less and some pockets of freezing drizzle this evening and tonight. A light wintry mix early thursday morning changes to rain by mid to late morning. Rain continues through the afternoon as temperatures warm into the mid in addition to the rain some areas of fog are possible. Rain continues through friday morning and into the afternoon. Late afternoon and evening is when the temperatures will start to fall and be cold enough to change the rain to light snow. Scattered snow showers are expected friday night through about noon saturday. A few inches 14 of snow are possible with the most snow tracking scattered light snow 1 or less and some pockets of freezing drizzle this to late morning. Rain continues