Is nbc nightly news, reporting tonight lester holt. Good evening. The identity of the britishaccented executioner, the man whos become the face of isis brutality has apparently been unmasked. Until now known as jihadi john but senior u. S. Intelligence official confirms that a londonraised former University Student is the sinister figure whose videotape taunts and beheadings of western hostages have horrified people around the world. And tonight with the real name we are beginning to unravel his journey from the neighborhoods of west london to syria to the hierarchy of isis. With more heres nbcs keir simmons. We are an islamic reporter his british accent was one of the few clues to his identity in isis propaganda videos only his eyes showing from behind a hood. But today he was identified. He is Mohammad Emwazi came to kuwait in 1994. The son of a welltodo family that reportedly lives in this middle class home where police gathered far from the desert where emwazi was the front man. American journalist james foley, then journalist stephen sotloff, american aid worker pete kas kassich. This man knew emwazi in london. Does that sound like the man you knew . Im not certain but i cant deny the fact there are a number of similarities for sure. Reporter the reporter who identified emwazi says he wasnt always violent. He was a shy person. He was very devoted to religion devoted to family. Reporter he studied Computer Programming at westminster university. Leaving in 2009. Emwazi did have connections to extremists in somalia and was known to the British Security agencies. But he left britain in 2012 for syria where he joined isis and became a symbol of their brutality. Today the daughter of one slain hostage said identifying emwazi was a good step but she wants more. Its a good step but i think all the families will feel closure and relief once theres a bullet between his eyes. Reporter and tonight there are questions about w Mohammed Emwazi was able to leave despite being on radar. Despite what happened to this britishraised and educated young man that apparently turned him into a world famous and coldblooded killer lester. Keir simmons in london tonight. Thank you. The dangerous reach of isis extends all around the world including into this country using the power of social media. The arrest of three men from new york and what the fbi says was a plot to support isis seems to be the latest example of a rapidly growing trend. And a top fbi official admitted today that we are losing the battle to stop the spread online. Our justice correspondent Pete Williams is monitoring the latest from our washington newsroom. Pete good evening. Reporter lester, good evening. The latest is federal authorities are questioning a man in norfolk, virginia to see if he played a role in raising money for the plan to travel to syria. No charges yet Officials Say as they continue their investigation. In the brooklyn neighborhood where the men charged with supporting isis lived and worked a Community Leader says hed tried to talk one of them habivoev out of becoming radicalized. We had an argument with the gentleman about understanding of the way he understands islam. Reporter u. S. Officials say the brooklyn men were lured by isis propaganda and that two of them bought plane tickets to get to syria. Intelligence agencies say as many as 20,000 people from 90 countries have traveled to syria to fight, many to join isis. They say 180 americans have either gone or tried to. 20 from the u. S. Have been stopped in the past year and a half ranges in age from 15 to 63. Isis now has social media feeds in 23 languages. And the director of National Intelligence said today its virtually impossible to stop. The problem there is their ubiquitous use of the media, and so the challenge is how do you take down the internet . Reporter frances interior minister in california last week urged Google Facebook and twitter to be more aggressive in weeding out isis propaganda instead of relying on users to flag it a process youtube says works quickly. Some in congress say social media should have zero tolerance for jihadist propaganda. We would never allow isis to take out an ad in the Washington Post recruiting folks to go to syria, radicalize and come back and kill us. We wouldnt allow that to occur. Reporter in minnesota today a teenager stopped last may at the airport admitted in court he was trying to get to syria. He pleaded guilty to a terrorism charge and could face up to 15 years in prison lester. All right, pete. Isis has demonstrated time and time again its lack of respect for human life. It comes as little surprise that it has no respect for Human History either. Were now seeing shocking images of isis members laying waste to priceless artifacts in the very cradle of our civilization. Our chief Foreign CorrespondentRichard Engel has our report. Reporter add cultural genocide to isis growing list of crimes. The group which has killed terrorized and uprooted hundreds of thousands of people in iraq and syria is now destroying their heritage too. [ speaking in a Foreign Language ] we were ordered by our prophet to take down old idols and destroy them says this member in a video released by the group. Which includes music and slow motion sequences. Then the men go to work ransacking mosuls Renowned Museum and a nearby archaeological site demolishing irreplaceable statues and works of art. Some crumble with a mere push. Others require more effort. The big ones are defaced with power drills. Including this winged bull a god who protected the syrian empire 2,500 years ago, now powerless against these modern day vandals. To see these pieces being smashed like that is really heartbreaking. Reporter archaeologist Michael Donte has worked and studied the region for years. Isis is conducting a war on culture, war on cultural diversity. Reporter isis is taking a hammer to history systemically wiping out traces of prehistoric culture in areas under its control. Destroying artifacts of civilization itself. Richard engel, nbc news istanbul. Back in this country now, the winter without mercy brought much of the south to a grinding halt over the last 24 hours. Paralyzed by yet another storm of snow and ice. While in the midwest and the northeast bitter cold is returning to areas that have already seen records shattered this season. Nbc ease Peter Alexander has more on the freeze that feels like its never going to end. Reporter offshore and on ice, dozens of lobster boats frozen in place in maine for weeks now. Fishermen unable to do their jobs. In connecticut temperatures diving into the teens, water freezing as it left the hose at this house fire. And in New Hampshire a harrowing survival story for dean mullens buried alive for hours after snow slid off his roof right on top of him. I had no time to move. It was just moving so quickly. And ended up pinning me on my back. Reporter from the midwest to the deep south, punishing cold and snow. Im kind of sick of it yeah. Reporter more than a foot in alabama stranding hundreds of drivers on i65 overnight. Take what the road gives you, you know . And deal with it. And be calm and go slow. And youll make it through. Reporter more than 11 feet in maine, 132. 5 inches tens of thousands still without power in north carolina. And how about that cold . Cleveland on pace for its most frigid february on record. Both syracuse and bangor en route to their coldest month ever. Nonstop. Nonstop. Day and night. Reporter in virginia we met plumber showing no signs of cooling off. Been a nasty winter. Reporter still, this winter is producing stunning scenes like nantuckets nearly frozen waves, this bald eagle keeping her little ones warm and along Lake Superior so cold its now safe for wisconsins famed ice caves to welcome guests again. Spring barely three weeks away. Peter alexander, nbc news arlington, virginia. And dont look now, just about three weeks to spring and there is another big snowmaker on the way for much of the country. Janice huff is in the weather center. Janice notice i no longer ask you if theres relief in sight. I know the answer. You know what lester some parts of the northeast that have been dealing with this brutal cold for so long will get a bit of a reprieve next week for a brief time. But overall were still stuck in the pattern. And now a snowstorm that will be developing over the southern rockies is going to move out into the plains over the next couple of days. So for tonight around denver south towards albuquerque in the Higher Elevations up to a foot of snow expected. That spreads towards dallas on friday afternoon with some light snow looking like maybe one to three inches towards Oklahoma City. And then another snowstorm, another piece of energy forms another snow area on saturday afternoon. Thats wichita, Oklahoma City that spreads towards st. Louis by sunday morning and then towards chicago later in the day on sunday and the afternoon. South of that towards cincinnati a mix of rain maybe some sleet in the warmer air. Temperatures across much of the Northern Tier are still in the single digits. Windchills are still below zero in many spots. And were still going to see waves of that cold coming through over the next several days lester. Janice huff thanks very much. Now youve heard all this talk about the future of the internet. It may have just been decided in a landmark vote today by the fcc. It concerns Net Neutrality which supporters say will ensure open access to the web for everyone. Opponents however say it amounts to government control over the internet. Nbcs tom costello explains what it all means for you. Reporter to understand what Net Neutrality means, think of the internet as a super congested highway with most of the wider lanes taken by big fat trucks carrying content like amazon netflix and hulu. The new rule means those companies will not be able to pay to dominate the fast lanes. All of us from students studying at home to mom and pop businesses to the amazons of the world will be guaranteed equal access to the fastest service. The internet is simply too important to allow broadband providers to be the ones making the rules. Reporter the new fcc rules will also prohibit Internet Service providers like verizon, at t and comcast, nbcs parent company, from slowing down internet traffic and blocking access to competitors. That means a vast majority of us will see no change to our Internet Service. And internet providers will not be allowed to limit what we see at home or on our smartphone. This is about preventing a future where some websites would have gotten preferential treatment over other websites. Reporter critics say the new rules amount to government overreach. This is not what thinte needs. And its not what the American People want. Reporter expected now, a vigorous legal challenge to this new law of the web. Tom costello nbc news washington. We turn now to a hollywood mystery after the oscars a heist involving one of the biggest stars on the red carpet. Academy award winner lupita nyongo, shes missing something thats very expensive that tens of millions of people saw days ago stolen right from under her nose. Nbcs Hallie Jackson reports on the race to find it. Reporter its a hollywood whodunit. A jawdropping dress that dropped off the radar. Just three days after Actress Lupita Nyongo wowed at the oscars winning raves on the red carpet. Nyongo says it took a village to get her into the gown weeks to create it but it disappeared in a matter of minutes from a highend hotel in West Hollywood where the actress had been staying. The custom calvin klein created from 6,000 rare pearls worth an estimated 150,000. I have never, ever heard of an oscar gown being stolen. Reporter this dress has become sofa famous. What can you do with it once its stolen . They could restring the dress and nobody would know those pearls came from that dress. Reporter l. A. Detectives hope Surveillance Video from the hotel, which says its working with police tips them off to whoever took the dress. Nyongos not commenting and neither is francisco costa, one of the designer who helped elevate the look. For a fashion icon its now a stunning wardrobe malfunction no one saw coming. Hallie jackson, nbc news los angeles. A lot more news ahead tonight including our nbc news exclusive, breaking her silence about the tragic loss of her father. Robin williams daughter speaks for the first time about the questions surrounding his death. Also the slowspeed chase in the wild west that captivated folks all across the country today. The ending, you just got to see for yo woman the constipation and belly pain feel tight like a vise. How can i ease this pain . man when i cant go, its like rocks piling up. I wish i could find some relief. announcer ask your doctor about linzess a oncedaily capsule for adults with ibs with constipation or chronic idiopathic constipation. Linzess is thought to help calm painsensing nerves and accelerate bowel movements. It 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. 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And now introducing aleve pm for a better am. In the six months since his death Robin Williams family hasnt said much publicly preferring to mourn in private. But now his daughter zelda is breaking her silence in an exclusive interview with our National Correspondent kate snow about her fathers legacy and how she copes with questions surrounding her sudden loss. Gets a lot of attention. Reporter after her fathers death Zelda Williams tattooed a humming bird on her right hand because she wanted to see it every day. I like humming birds. Humming birds are fun and flighty and strange. Its hard to keep them in one place. And dad was a bit like that. Keeping a conversation in one moment was impossible with him. Look at the car look at the car for me it was a reminder i wanted. Reporter i lost somebody to suicide too, so i know that theres often that sort of why did this happen question. I dont think theres a point. Reporter youll never know. No its not important to ask because its reporter that seems to me what all the people who knew your dad as a fan and loved him, when it happened everybody wanted to know why, how could this happen. Diseases are until we find out exactly how they work we dont have an explanation. A lot of people who have been through it and lost someone in any way, the ones that i found that have gone to lead very full lives found that they just had to know that theres no point questioning it. And theres no point blaming anyone else for it. Theres no point blaming yourself or the world or whatever the case may be. Because it happened so you have to continue to move. And you have to continue to live and manage. Reporter on friday in los angeles Zelda Williams will present a noble award to a group that Robin Williams worked with for years that provides prosthetics other than comedy it was his favorite. Reporter repor she wants to carry on her Fathers Charity work because it was so important to him. She knows shes not the only one who misses her father. And everyone has a favorite memory. The world, as i said keeps spinning. Doesnt mean he was never on it. Reporter kate snow nbc news los angeles. And weve got more to tell you about as we continue tonight. Well be back with a story that had a lot of our viewers talking. Also excitement building tonight after a mysterious announcement by apple. Apples fall, but the apples of your cheeks dont have to. Defy gravity. Juvederm voluma® is the only fdaapproved injectable gel to instantly add volume to your cheek area. As you age, cheeks can lose volume. Voluma adds volume creating contour and lift for a more youthful profile. For up to two years. Temporary side effects include tenderness, swelling, firmness lumps, bumps, bruising, pain redness, discoloration and itching. Ask your doctor. Juvederm voluma®. Defy gravity. When the moments spontaneous, why pause to take a pill . Or stop to find a bathroom . 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A Navy Combat Ship named in her honor hit the water for the very first time this week in alabama. It wont officially launch until later this year. In the meantime the u. S. S. Gabrielle giffords will get some finishing touches. And about last night, we had an overwhelming response to our making a difference story. We brought you about the prospector Movie Theater in ridgefield connecticut, and its mission to give people with disabilities what they say they wa most jobs and meaningful employment. The staff watched from the theater and sent us this photo. Theyve heard from people across the country, some who want to bring the idea to their own communities. If you miss the report its on our Facebook Page at nbcnews. Com. I hope youll take a look. Well continue to follow their story. When we come back here tonight, the chase that made people across the country drop they call it planning for retirement because getting there requires exactly that. 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For annuities, insurance and investments, choose pacific life. The power to help you succeed. It was a desperate chase today for two fugitives and it gripped the nation as it played out live on the tv. In the spirit of butch and sun dance, or maybe thelma and louise they made a break together. These were no ordinary outlaws and reigning them in was no easy task. Nbcs Miguel Almaguer has the wild tale. Reporter in sun city today this may have been the very definition of the wild west a slow sometimes High Speed Pursuit of two lamas on the loose breaking away from their owners at times from each other, seizing their moment and their shot at freedom. Something you dont see every day. Well keep an eye on this folks. Reporter the twohour chase carried live on local, even cable news. This wild tale dubbed lamas on the lam. The drama drama trending on twitter. The Arizona Cardinals agreed to oneyear deals with lamas on the loose. The lama chase, the biggest since o. J. Its gotten wild out west before. Weve seen bears in backyards running from the law. There goes momma climbing to get her baby. Reporter ducks have made a dash or at least a slow waddle along the freeway. And a moose on the loose brought traffic to a standstill. But this was lamas. Lamas. At one point one of the deputies was trying to capture a lama with crime scene tape. Reporter like most getaways it didnt end well for the suspects running out of breath and time, they were lassoed by modern day cowboys. A good run while it lasted. Miguel almaguer nbc news los angeles. That will do it for us on this thursday night. Im lester holt. For all of us at nbc news, thank you for watching and good nigh the kardashian record smashing 1 hundred Million Dollars deal . This front page headline says it all. Now on extra. Dash rhymes with cash. Kim and her Famous Family lock in the deal of the accept tree to stay on tv. We work hard and we play hard. We mostly work hard. How much each of the girls will rocket. Bruce and robout cut out of the deal. Kim and kanye at the star star packed britt awards asthma donna crash lands on stage. Imagines first words about her fall. Robin williams daughter zelda sits for her first interview