Fbi. Tens of thousands listened to it play ou joe fryer is in oregon and starts us off with late details. Reporter tense moments on the 41st day of the wildlife refuge occupation, all of it broadcast live online. After three holdouts turn themselves in, the fourth and final og pier, david fry, refuses to surrender. Im a free man, i will die a free man. Reporter before finally peaceful lip giving up. If everybody says hallelujah, illome out. When they said hallelujah, he came out. Reporter the fbi moved in last night. Tens of thousands were listening. Lets be clear. Armed occupation of federal property is a crime. It is not a peaceful protest. Reportete among those negotiating with the group reverend of billy gram, and michelle fiori. Never lost faith. Mission, and the accomplished. Reporter armed militants too over the wildlife refuge nearly six weeks ago protesting federal ownership of western lands. One was shot and killed in a confrontation with law enforcement, and others were arrested. Last night clive bundy was taken into custody after landing at the portland airport. He was not part of the occupation, rather his arrest is from a standoff with armed forces. Bundy joins his sons behind bars. Over. The refuge will still be closed for weeks. The sheriff calls it a crime, the fbi said it must be searched for explosives. In all, 25 people linked to the been indicted on federal felony charges. Lester . Joe fryer in oregon, thank you. A major endorsement for Hillary Clinton is spotlighting the critical battle under way for africanamerican votes in South Carolina. A february 27th democratic primary there will be bern i sanders first cast in the south, and before a large number of black ters. Today clinton, who polls show hold a substantia lead among black voters got an important shot in the arm from a civil righ icon, who to sanders delivered just a shst. Nbcs Kristen Welker has detail reporter as Hillary Clinton and Bernie Sanders prepare to face off in milwaukee tonight, there are already fireworks. Theres no one else better to be prepared to be president of the United States of america than Hillary Clinton. Reporter the influential political arm backing clinton today. It was congressman john lewis who delivered a major blow to sanders, questioning how active rights movemt. I never saw him. I never met him. I was involved in the sitins, the freedom ride, but i met president clinton. Reporter the sanders campaign, bernie is a great admirer of lewis. Releasing this endorsement video featuring the young daughter of eric garner who died after police put him in a choke hold in 2014. To go up against the criminal jususce system. Thats why im for bernie. Reporter all underscoring the importance of the african vote, like South Carolina, where clinton leads sanders among africanamericans 74 to 17 . One challenge for sanders, his complicated relationship with president obama, on display during an interview with nbcs kasi hunt where they discussed the gap. You dont think president obama has successfully closedd that gap . No, i dont. Effort. When i talk about a Political Revolution is bringing millions and millions of people into the political process. Reporter the Clinton Campaign firing back. Considering how little senator sanders has to show for his 25 years in congress, the idea that he would be giving leadership lectures to president obama is absurd. Reporter our latest poll shows president obamas Approval Rating among africanamericans in South Carolina is at 92 . So expect secretary clinton to again embrace him tonight i i what could be the most contentious debate yet. Ster . Kristen, thank you. The republicans face off in South Carolina a week earlier than the dems, a week from saturday. Toght much of the fight to take down the highflying Donald Trumps taking place on the ground there. Ted cruz who won the first const in iowa is trying to bounce back from his loss this week in New Hampshire with an aggressive ground game trumps conservative credentials. With more, heres hallie jackson. Eporter matt wells quit his sales job in iowa to sell ted cruz instead alongside 10,000 volunteers in South Carolina. I can get another job when i get back. I cant get another country. Its a risky move, quitting your job ill go back to iowa and go back to work and all that. Try to help ted win here first. Reporter wells is one of nearly 10,000 volunteers here i i South Carolina, making some 25,000 phone calls a day. Partf the organization cruz is depending on to topple donald trump here, like he did in iowa. The state of South Carolina, i dont think people are interested in someone, a republican candidate whos pushed partial birth abortion, who wont defend marriage. Reporter cruzs strategy, paint trump more ads like this one on the way. He pretends to be a republican. Reporter for his part,rump seems to be playing a more positive political game than before. Itt going to be such an unbelievable week and a half. Reporter but in the more mannerly south, his more colorful language may be a big turnoff. Ha gets the nomination theyre going to sue his bleep ] off. Reporter as the focus group found. Its crass. Its nonprofessional. A leading president ial candidate saying profanity from a stage. Reporter marco rubio and jeb bush, meanwhile, taking shots at the frontrunner how do you think donald trump g gng to washington will solve anything. Jeb bush has no Foreign Policy experience, period. Reporter trying to prove South Carolina isnt simply a twoman fight. Underscoring that point, a new cruz ad slamming rubio for being nothing more than a pretty face. This race getting new robocalls. In a new twist, jeb bush is getting backup on the trail from his brother, former president george w. Bush making his Campaign Debut on monday. Lester . Hallie, jackson, thank you. Its always there, lurking, and now the dreaded polar vtex is heading south, bringing with it the coldest air of the season for tens of millions of us. Al roker joins us wit the details. Yeah, lester, it will be potentially deadly weather coming in. The polar vortex is already there, but it will shift over to the northern atlantic. The jet stream dips to the south. That means that cold air spills southth of the canadian border, into the northeast, and t t midwest, bringing some of our colder temperatures that we have seen yet. Bismarck tomorrow will feel like 7, minus 7 in minnfapolis. 13 in cleveland. As we get into saturday morning, youll,see those temperatures Single Digits and below. And we bottom out sunday morning, records possible in boston with minus 5, 2 rochester, 1 in pittsburgh, roanoke 10. You get out west, its going to feel like a different season. From seattle all the way to roswell and down to san diego, it will actuay feel like temperatures in april and may. So weve g two Different Countries depending on where you live. Al, hanks. Good to have you here. The International Olympic committee tried to reassure the world today that all measures are being taken to fight the zika virus ahead of the games in rio. But u. S. Officials are taking their own precautions as we hear from a star athlete casting doubt on whether shell compete. The outbreak has led to an emergency appeal from top u. S. Officials, health officials. As our rehema ellis reports. Reporter puerto rico could be the next hot spot for the zika virus, warns the cdc, testifying before the senate today. At some point we may well see tens or hundreds of thousands of zika infections in puerto rico. As the u. S. Olympic committee announced itss hiring two Infectious Disease experts to advise the 500 athletes hoping to compete in brazil. Including soccer star hope solo. If i had to decide today, i would not go. Fortunately, the summer olympics are about six months away. I think we have time to get our doubts and questions answered. Reporter the soccer teams will compete in areas even more vulneneble to zika than rio. One is near the amazon ra forest. Another in an area where the number of zika cases are especially high. I dont think soccer being so close to the rain forest where theres more mosquitoes. I take my health very seriously. We all do. Reporter new research has found more evidence linking zika to babies bornn with microcephahas. Olympic athletes have competed while games in 2012, including gold medalest kerry walsh jennings. Well bee waiting to hear what steps will be taken to make sure everythings safe and secure. Reporter with women making up half the american team, the countdown to the olympics is on. Rehema ellis, nbc news, new york. A California Utility Company now says its finally stopped the leak from a ruptured well that has been spewing massive amounts of natural gas into the air near los angeles. Making people sick and forcing thousands of families from their homes in porter ranch. Its beenh leaking for nearly four months. Invisible to the naked eye, b the giant cloud apparent in infrared images. The plug is a temporary fix, but if it holds, i i will be cemented closed. They face a lawsuit over the investigations in all this. Nato is intervening in the massive refugee crisis sparked by the war i syria. Its deploying patrol boats to intcept as many flee syria, others are trapped, including hundreds of thousands in syrias largest city. Nbcs chief foreign correspondent, richard engel, shows us the desperation inside aleppo. Reporter the Syrian Regime has been fighting rebels in aleppo for years now. But an air strike is clearing the way. First syrian troops e advancing and destroying the cityyn the process. Activists in the White Helmets dig through the rubble for survivors. They provided us with this footage to show the world what is hahaening in aleppo. One of the volunteers told us by skype that he fears the citys fall is near. We are so worried, because if we lose aleppo, we lose all the war. Reporter the russian involvement changes the game . Yes. Absolutely. It changes everything. Reporter aiding, already escaping aleppo inhe last few weeks. Panic is spreading in aleppo that thehe regime plans to starve the city into submission. Its a tactic theyve used in other places. Thats why we are and all the world. We need help. Reporter what kind of help do you need . For . Now, we need just to stop the russians. Reporter the russians say they are bombing isis targets in alepep, but ismael said thats just an excuse. We dont havav any isis. They just helping the forces and killing us. Reperter the u. N. Said 300,000 people are still stranded inside aleppo and fears an unprecedented wave of refugees may leaving the city in the next few days. Making the worlds refugee crisis far worse. Richard engel, nbc news, new york. There is a lot more to tell you about tonight. Details about that nightmare cruise. Well hear firsthand fromhose onboard it. 30foot waves battered the ship. One newlywed said she feared she would die on her honeymoon. They could be the first astronauts on mars, and theres if you have postmenopausal osteoporosis and a high risk for fracture. I can tell you prolia is proven to help protect bones from fracture. But the real proof . My doctot said prolia helped my bones get stronger. Aryour bones getting stronger . Do not take prolia if you have low blood calcium, are pregnant, are allergic to it, or take xgeva. Serious allergic reactions, such as low blood pressure; trouble breathing; throat tightness; face, lip, or tongue swelling; rash, itching or hives have happpped in people taking prolia. Tell your doctor about dental problems, as severe jaw bone problems may happen, or new or unusual pain in your hip, groin or thigh, as unusual thigh bone fractures have occurred. Prolia can cse serious side effects, including low blood calcium, serious require hospitalization; skin problems; and severe bone, joint or muscle pain. Only prolia helps strengthen and protect bones with 2 2hots a year. I have proof prolia works for me. Can it work for you . Ask your doctor about pria today. Caring for someone th alzheimers means i am a lot of things. I am her best friend. I am her ally. So i asked about adding oncedaily namenda xr to her 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 king. Certain medications, changes in diet, or medical conditions and may increaseside effects. The most common side effects are headache, diarrhea, and dizziness. All my life, shes been there for me. Now i am giving back. Ask their doctor about oncedaily namenda xr and learn about a free trial offer at namendaxrxrom. We are back now, with the passengers thankful to be back on dry land on what one called the cruise from hell. The ship rocked by a Hurricane Force winds and 30foot waves. Water rushing inside. Many wonderinghy the ship set sail with that storm coming in the first place. Heres the details. Reporter passengers describe it as terrifying. The chaotic hours, the anthem of the seas sailed into the middle of a massive storm. I thought im going to die. Im going to be drowning in the ocean. It was very scary. Reporter lee wright was on her honeymoon. Kyle leveque was with his mom. Absolutely. I think 5,000 people lives were at risk. Reporter Royal Caribbean say the storm became worse than predicted. Two days before the cruise even stard, the National Weather service predicted waves as high as 31 feet. In the same area anthem battled the storm. This was a system that was well forecast days in advance. There were even hurricane wind at the cruise ship left for the area where they hit the hurricaneforce winds. Reporter passengers say the ship felel like it was tilting side to side in Hurricane Force winds. Waves crashing as high as the fifth deck. Inside, passengers scrambled for cover amid shattered glass and flying furniture. One of the scariest day of my entire life. Reporter tonight the ntsb is part of the investigation into what happened, and the coast guard reports the ship needs more repairs beforor it can sail again. Royal caribbean said them is scheduled to cruise the same waters starting saturday, when theres a possibility of yet another storm. With the 4500 passengers getting refunds and credit toward a future cruise, few regret this vacatatn is over. Im grateful im alive. Reporter nbc news, new jersey. When we come back, its taken a century, but one of einsteins famous theories has right. toilet flush if you need an opioid to manage your chronic pain, you may be sooo constipated it feels like everyone can go. Except you. Tried many things . Still struggling t tfind relief . You may have opioidinduced constipation, oic. Its different and may need a different approach. Opioids block pain signals, but can also block activity in the bowelf which is why it can feel like your opioid pain med is slowing your insides to a crawl. Longing for a change . Have the conversation with your doctor about oic, and ask about prescription treatment options. Made on behalf of those living with chronic painl, you cant predict. The market. But at t. Rowe price, your investments through good times and bad. For over 75 years, our r ients have relied on us to bring our best thinking to their investments so in a variety y market conditions. You can feel confident. In our experience. Call t. Rowe price retirement specialist or your advisor. To see how we can help make the most of your retirement savings. T. Rowe price. Invest with confidence. What if one piece of kale uld protect you from diabetes . What if one situp could prevent Heart Disease . One. Wishful thinking, right . But there is one step you can take to help prevent another serious disease. Pneumococcal pneumonia. If you are 50 or older, one dose of the prevnar 13 vaccine can help protect you from pneumococcal pneumonia, an illness that can cause coughing, chest pain, difficultyreathing, and may even put you in the hospital. Even if you have already been vaccinated prevnar 13 may help provide additional protection. Prevnar 13 is used in adults 50 and older to help prevent infections from 13 strains of the bacteria that cause pneumococcal pneumonia. You should not receive prevnar 13 if you have had a severe allergic reaction to the vaccine or its ingredients. If you have a weakened immune system, you may have a lower response to the vaccine. Common side effects were pain, redness or swelling at the injection site, limited arm movement, fatigue, headache, muscle or joint pain, less appetite, chills, or rash. Get this one done. Ask your doctor or pharmacist you dont see this every day, a congressman getting a nicotiti fix right in the middle of a hearing. Duncan connor took a puff off a vaporizer to protest a measure that would ban it on planes. He said theres nothing toxic about the vapor. The congresswoman next to him waving it away didnt seem to appreciaia it. Titanic is getting a sequel. Its debeb is being pushed back from this year to 2018. An australian tycoon commissioned a replica over a century after the original sank. The new one is said to have upgrades including more lifeboats. A major announcement today confirming something einstein predicted a century ago. Scientists have dected navigational waves rippling across the universe, when two black holes collide to think of it like the Ripple Effect of spreading water when you drop a rock. Except these collisions so monstrous they can shake the fabric of spacetime. Its a very big deal, or so iv been deal. When we come back, suiting up with nasas next generat