From nbc news World Headquarters in new york, this is nbc nightly news. Reporting tonight, savannah guthrie. Good evening. Tonight, the video of a dramatic and deadly encounter between police and a homeless man in los angeles. Officers shot and killed the man after a violent scuffle captured by surveillance cameras, cell phones and body cameras worn by two officers. Tonight, authorities are examining all angles to figure out whether police made the right call in a split second or used excessive force. Our report now from nbcs gabe gutierrez. And a warning, the video and audio are graphic. Reporter Police Responding to a robbery call in the neighborhood known as skid row when the violence suddenly erupted. The videos posted on social media show lapd officers confronting a homeless man. Theres a scuffle. Hes taken down, and officers try to cuff him. Next, the sound of a taser. Someone yells, drop the gun. Then [ gunfire ] at least five shots from three officers leaving bystanders and witnesses in shock. I think it was kind of extreme. He didnt bother nobody. He didnt have no weapon. They just shot him. Reporter today, the lapd displaying enhanced still pictures said the man reached for an officers weapon. This is an awful tragedy. But, you know, the officers took on the face of it reasonable steps to avoid it. Right here. Reporter this is a spot where dennis horn took one of his cell phone videos. Minutes before he says he captured these last images of the man known on the streets simply as africa. Surveillance video from a nearby homeless shelter shows the suspect talking to police then entering his tent. Thats when officers draw their weapons. Now, four officers reporter scott rees is a former s. W. A. T. Officer for the lapd and expert on the use of deadly force. Most of these situations are over between 2. 5 and 3 seconds. And in that period of time you are going to be held to answer for years and years for those 2. 5 to 3 seconds. Reporter tonight, on skid row a makeshift memorial is growing and so is the number of unanswered questions. Police say the suspect was not carrying a gun of his own. The officers involved in the shooting are now on paid leave, two of them have been wearing body cameras. And investigators here are now beginning to look at that video. Savannah. Gabe gutierrez in los angeles. Thank you. Could the footage from those body cameras worn in l. A. Help determine just what happened . Across the country a growing number of officers are wearing them in the wake of high profile accusations of police misconduct. As tom costello reports now, the cameras can capture dramatic evidence from a Vantage Point rarely seen. Reporter from an officer shot in albuquerque [ gunfire ] to a Police Shooting in oklahoma. Body cameras are proving to be a critical eyewitness for police and citizens alleging police misconduct. More than 5,000 departments are using or testing the cameras including big departments, not just the lapd, the nypd, d. C. And seattle. Go ahead and place your hands behind your back real quick. Reporter Las Vegas Police bought 200 cameras after Community Leaders demanded more police accountability. We need that trust. We need that support from our community. If this raises that, then thats where we need to go. Reporter every uniformed officer is now required to video record every citizen contact. And police insist the cameras capture what a bystander with a camera might not see. In this training scenario only the officer can see the man has a gun. Dont touch that gun or youll be shot again reporter nationwide cities and states are drafting new laws and procedures to ensure police cant delete or edit the video and, most importantly, to determine when should the camera be turned on. Ideally from accountability standpoint, the cameras would be on all the time. But thats not practical and would raise very intense privacy issues for the public and for the police officers. Reporter one big challenge is simply storing and managing vast amounts of video data. How long video is kept depends on the case. A Traffic Accident just a few weeks, but a Homicide Investigation perhaps decades. Already cameras have been used to discipline and exonerate officers. Take care of yourself and be careful. Thank you. We trust them and give them a gun and badge to do that. But this is a way to review whats happening if theres a complaint. Reporter and camera say advocates, have a funny way of ensuring police and citizens are on their best behavior. Tom costello, nbc news, washington. Israels Prime Minister has arrived in the u. S. At a tense and critical moment. The u. S. Trying to get a nuclear deal with iran to stop it from getting a bomb. And israel warning the u. S. A bad deal endangers its very existence. Our chief Foreign Affairs correspondent Andrea Mitchell is in washington where the Prime Minister will make his controversial address to congress tomorrow. Andrea, good evening. Reporter good evening, savannah. Prime minister netanyahu told supporters today he is not trying to be disrespectful to president obama. Even as he prepares to Lobby Congress tomorrow against the president s negotiations with iran. Embattled at home and facing reelection in only two weeks, Benjamin Netanyahu tried to play down his war of words with the white house but said he cannot remain silent about a u. S. Nuclear deal with iran. That he says would let iran get a Nuclear Weapon. I have a moral obligation to speak up in the face of these dangers while theres still time to avert them. Reporter speaking to a powerful support group, americas proisrael lobby, the combative israeli leader previewed what he will Tell Congress tomorrow. American leaders worry about the security of their country. Israeli leaders worry about the survival of their country. Reporter the administrations pointed response, at the same moment john kerry in geneva was trying to close the deal with irans foreign minister, a deal the president believes would make the world safer not more dangerous. There is a substantial disagreement in terms of how to achieve that. And what it boils down to is whats the best way to ensure that iran is not developing a Nuclear Weapon . Reporter the relationship between the two leaders at a new low. Poisoned, u. S. Officials say, by netanyahus acceptance of a republican invitation to Lobby Congress against obamas iran policy. Hes trying to kill the one thing that obama has that might redeem a weak foreign policy. Reporter some prominent noshows tomorrow, joe biden is in guatemala. And almost 40 Democratic House members and five senators will boycott. Despite Prime Minister netanyahus assertions, obviously whats taking place is extremely partisan. Reporter as to netanyahus speech tomorrow to congress is destructive to the relationship president obama has said tonight its has been a distraction but in the meantime the negotiations with iran are going full speed ahead. Savannah. Andrea mitchell in washington, thank you. The war against isis continues to play out on multiple fronts tonight. A new online threat against twitter has surfaced. A warning that the companys cofounder himself would be targeted. And were seeing a major offensive against isis militants tonight by the same forces that ran from them just last year, the iraqi army. We get the latest now from our chief Foreign Correspondent richard engel. Reporter the iraqi army with allied Shiite Militia are finally on the offensive trying to take back a city isis has held since june. And not just any city, theyre going for tikrit, saddam Husseins Sunni hometown. Its a crucial test to the u. S. Supported iraqi government. Success here would renew hope that it can defeat isis. But if tikrit becomes an ethnic blood bath, shiite against sunni, iraq will be one step closer to allout sectarian war. Meanwhile, in london new details about the man once known as jihadi john. It turns out even as a student Mohammed Emwazi had friends who would grow up to become violent islamists including some who would die fighting for isis. He was deeply involved and deeply embedded with extremist circles in london long before he went to syria. Reporter and yet another turn in the propaganda war, an online threat against twitter cofounder jack dorsey and other employees of twitter which has been blocking isis propaganda messages. The threat from an unknown source has been repeated on accounts linked to isis. Twitter says in a statement, our Security Team is investigating the veracity of these threats with relevant Law Enforcement officials. Twitter has been taking down isis propaganda almost as quickly as the group has been posting it, apparently enraging isis. The groups followers posting online that your virtual war against us will cause a real war on you. Savannah. All right. Richard engel, thank you so much. Tonight, tensions remain high in and around moscow one day after tens of thousands turned out to protest the killing of one of Vladimir Putins most prominent critics, Opposition LeaderBoris Nemtsov who was killed by an unknown gunman while walking on a bridge near the kremlin late friday night. Security camera footage of that incident has surfaced amid questions as to whether other cameras in the area were working at the time of the murder. Putin himself has announced he will personally oversee the investigation which is now under way. Tonight, as we roll into march 18 days until spring, the season of misery providing no letup as another storm barrels across the country. 30 states are under Winter Weather advisories yet again. A whiteout coasttocoast. Nbc news meteorologist dylan dreyer has our report tonight. Reporter enough is enough, thats the feeling in boston today as residents woke up to more snow. Bostonians like nanny nancy burns are fed up. Its frustrating. Its tiresome. Its become hard work just taking care of babies, hard work. Reporter the area punished by four major snowstorms in four weeks totaling nearly seven feet, crippling mass transit. Its unreliable. I cant use it to get to school or to work. Reporter its miserable from retail to restaurant. Weve seen a 30 to 40 decrease in business. People just cant get here. They cant walk here. They cant park. Its been a tough winter. Reporter heavy snow is triggering roof collapses across new england. In norwell, massachusetts, more than a dozen horses had to be rescued this morning after this barn caved in. Icy conditions were to blame for pileups from pennsylvania to virginia to missouri. Just today nearly 4,500 delays and 1,300 cancellations. Some stranded this weekend for nine hours in dallas. February goes down as one of the coldest ever on record in chicago, cleveland, bangor, maine, and syracuse, new york. In southport, new york, the deep freeze froze the waves along the long island sound. Even sunny Southern California couldnt escape a winter storm. Huntington beach and boardwalk covered in hail an inch deep today. While in boston many are hoping march brings warmer days and a lot less digging out. And tonight, again, 38 states are under some sort of Winter Weather advisory. In the upper midwest, in the Northern Plains tomorrow we could see blizzard conditions, more because of blowing snow. And then we are going to see this storm bring snow, then ice, then rain to major cities like chicago. Youll see that during the day. Then it spreads into the northeast as we go into tuesday night with accumulating snow before that changeover to ice and rain. Then as we go into wednesday the storm clears out. Well see a couple of showers up and down the east coast, rain showers. But baxter, kentucky, thats where were going to see accumulating snow on the backside of this cold front. We could see as much as four to eight inches in kentucky, southern ohio and west virginia. 2 to 4 inches in the northeast. That is going to put us very close, savannah, to breaking that alltime record in boston. All right, dylan dreyer, thank you so much. Tonight, a surprising admission from pediatricians. A new survey found nearly all of them have been asked by parents to delay and space out the vaccines given to their children. And most of them agree even though that goes against expert advice and could leave children vulnerable to disease. Doctors said they didnt want to lose their patients. Today we also learned the Measles Outbreak continues to spread. Now 170 cases so far this year. A dallas nurse who survived ebola is suing the Parent Company of Texas Health Presbyterian hospital accusing that hospital of failing to provide adequate equipment and training to staff dealing with the deadly disease and violating her privacy by releasing details on her condition. Nina pham contracted ebola while caring for the first patient ever diagnosed with the virus on american soil thomas eric duncan, who died while being treated. Pham says she continues to suffer from body aches and insomnia and has yet to return to work. New records on wall street, the dow and s p finished at alltime high and the nasdaq closed above 5,000 for the First Time Since the dotcom bubble burst 15 years ago. A lot more news still ahead tonight including new concerns about the Wood Flooring found in so many homes across the country. A bombshell report has a major u. S. Company under fire and questions about safety. And a shocking free fall caught on camera. Tonight, we hear from the sky diver unable to open his parachute rescued while plunging to the ground. There is major fallout tonight for the Company Lumber Liquidators accused of selling potentially unsafe products from china. Tonight, the company is fighting back saying the flooring itself is safe. Meantime, though, its stock is taking a beating, down 25 today. And as nbcs Hallie Jackson reports, a lot of worried homeowners are wondering what to do now. Haley and matt just spent 2,500 on new laminate flooring from Lumber Liquidators. They loved it until about 24 hours ago. Its never a good feeling to find out that your kids are on a floor that could be potentially making them sick. Reporter now theyre upset because their flooring looks similar to a product featured on 60 minutes in a report that questioned the safety of some of Lumber Liquidators chinesemade laminate Wood Flooring. 60 minutes says it commissioned lab tests that found levels of formaldehyde that exceeded levels. If its toxic, i wouldnt want that in my house. Reporter on wall street stock lost some 300 million in value today alone. It certainly has to be one of the worst days in Lumber Liquidators history. Reporter the Company Recently warned about investors betting against the stock, known as short selling, spreading what it calls false attacks to make money. We will vigorously challenge any false allegations. Reporter and today the companys challenging the testing conducted for cbs calling the method improper saying its own testing is carefully documented and thorough. Our products are 100 safe, says the company. Adding, we stand by every single plank of wood and laminate we sell all around the country. We spoke with independent flooring consultant jim gould. Put it into context. How concerned should customers be right now . If they have a floor that was recently installed, i would go back to the supplier and ask the questions of how can i be reassured that this floor is fine. Reporter they did. Were told their floor is fine, but theyre not convinced. I want to make sure that, you know, the place were putting our children is safe. And thats what we thought we were doing. Reporter for now, its more fallout for this Flooring Company looking at its bottom line bottoming out. Hallie jackson, nbc news, los angeles. And were back in a moment with the surprise announcement today about one of the greatest sports superstars of alltime. The longest serving woman in the history of congress, democratic senator Barbara Mikulski of maryland announced today she will not seek reelection. She will retire when her fifth term ends in 2017. Mikulski who is now 78 years old, was first elected to the house in 1976 and has served in the senate since 1987. Forbes is out with its annual rankings of the rich, and a familiar name holds the top spot. The magazine says bill gates net worth rose to 79. 2 billion up from 76 billion last year. He has topped the list, by the way, for 16 of the last 21 years. Forbes says there are now more than 1,800 billionaires including some famous newcomers to the list. Among them, nba legend michael jordan. We put the full list on our website. And a milestone to note tonight. When it premiered 50 years ago on march 2, 1965, the sound of music wasnt exactly an instant sensation with the critics. The reviews were decidedly mixed. But in the decades since the movie based on the Broadway Musical by rodgers and hammerstein has become one of the most beloved family favorites. When we come back, we will hear from the sky diver who suffered a medical emergency, lucky to be alive thanks to quick thinking in midair. And it was all caught on camera. Finally tonight, the tale of the tape that has so many people talking today. A sky diver plunging to the ground unable to pull the cord and open his parachute after suffering a seizure midair. He was saved, and now hes telling his story. Nbcs katy tur has our report. Reporter 12,000 feet from the earth, the only thing between Christopher Jones and the western australian ground, the courage to jump. As he had so many times before. But 22 seconds into this dive he says he was suddenly paralyzed by a seizure. Unconscious and falling at 120 miles an hour. Instructor Sheldon Mcfarlane shot towards him not wanting to rely on the automatic emergency chute. It took two attempts to grab jones and pull the rip cord. With 10,000 feet to go jones regained consciousness and managed to make a controlled landing. I said thank you very much, i think thats what i said. I said thank you for saving my life. Yes. He couldnt have done a better job. It was just amazing. Reporter now mcfarlane is being hailed as a hero. Just doing my job. Doing what we train other people. Reporter 22yearold jones took up sky diving when his epilepsy ruled out his dream of becoming a pilot. Seizurefree for four years, his doctors gave him the go ahead. Ive always wanted to fly planes or i just wanted the feeling of flight. Obviously, with my condition i cant stay a pilot. So i thought next best thing i can fly myself. Reporter about 5 Million People have clicked on the deathdefying fall giving jones 5 million reminders to keep his feet on solid ground. Katy tur, nbc news, london. And that will do it for us on this monday night. Im savannah guthrie. Ill see you bright and early tomorrow morning on today. For all of us at nbc news, right now at 6 00 a landmark closing day. 15 years in the making. The nasdaq hits a storied high, but is it time to celebrate, or is this dotcom deja vu. Thanks for joining us. Not since the days of the dotcom boom have Silicon Valley tech stocks been this hot. You can see it here on this graphic. Now its over 5,000, and some worry were going to go for a roller coaster ride again. Are we doomed . Well i dont know if were doomed. Lets face it. Stocks are hot. Were probably due for a pullback in the near future. But this time around the Companies Leading the way up are making money. So experts say were not due for a bust any time soon. Yahoo opened today, sitting because it was full of nostalgia who remember the dotcom boom days when yahoo was king. It was an interesting time. I want it back to execute a series of stock trades. Thats 8x8 ceo who wants a