Nightly news begins right now. From nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. We begin with a followup to our exclusive reporting last night that u. S. Intelligence has determined Vladimir Putin has a direct hand in the russian effort to disrupt our election. Now today president elect trump may be signaling hes giving some credence to the russian link, while raising questio questions about why the white house didnt act more boldly on his findings about putin. Tonight, we may have learned the answer. How the Political Climate apparently caused the Obama Administration to pull its punches against russias mettling. Nbcs Cynthia Mcfadden continues her reporting. Reporter tonight, president elect donald trump seems to be pivoting a bit after our nbc news exclusive report last night that Vladimir Putin personally directed a russian clandestine operation to interfere in the u. S. Election. Tweeting, if russia or some other entity was hacking, why did the white house wait so long to act . Why did they only complain after hillary lost . This, a far cry from what hes been saying for months. Anything that goes wrong, they blame russia. Russia did it. They have no idea. It also could be somebody sitting on their bed that weighs 400 pounds. They dont even know its russia. Who knows. Personally, it could be russia. I dont really think it is. But who knows . I dont know either. They dont know, and i dont know. I wonder whether the tweet that president elect sent out today is the beginning of his pivot, the beginning of his acknowledgement of the intelligence to russias been hacking our institutions. Reporter retired admiral james stavridis, the former commander of nato met with the president elect last week. I think it is a legitimate question. And i think given the stakes at the national level, the question deserves an answer. Reporter nbcs Andrea Mitchell pushed hard to get that answer from the white house today. I think it was a powerful thing to have the Intelligence Community in that statement, vifr russian mettling in our election, approved by the highest levels of their government. Reporter the statement hes referring to was a onepage release on october 7th, which outlined the intelligence assessment that russias senior most officials were interfering in the u. S. Election. No direct mention of putin. Though a month earlier at the g20 summit in china, president obama privately confronted putin, the white house confirmed today. So should the administration have come out bolder and sooner with the hard intelligence they possessed, as donald trump suggested today . Should they have pushed congress to enact sanctions against the russians, making the public understand, this was serious . In retrospect, it certainly seems as though it was a mistake not to call the russians sooner and respond to them in a very forceful way. Reporter high level intelligence sources tell nbc news, the administration didnt take such actions because they didnt want to appear to interfere in the election. And they thought Hillary Clinton was gonna win, and they didnt think it was worth the potential risk of getting into a cyber tit for tat. Last friday, president obama asked for a full review. As for the russians, today mr. Putins spokesperson called the idea he was personally involved in the covert operation, quote, laughable nonsense. Our intelligence sources emphasize theres no evidence that donald trump collaborated behind the scenes with mr. Putin or the russians. Furthermore, a Senior Intelligence official tells us that the possibility of mr. Trump shifting his position, quote, will scare the ba jesus outside out of the kremlin. Lester . Cynthia, thank you. Breaking news tonight from charleston, where an avowed white supremacist has been found guilty on all counts of a horrifying massacre inside mother emmanuel church. Tonight, were getting reaction from a survivor who was forced to watch a coldblooded killer murder her son. Nbcs Gabe Gutierrez was in the courtroom. Reporter fueled by racism, he walked into their sanctuary and opened fire. This afternoon, a jury found dylann roof guilty of 33 federal counts, including hate crimes. I knew it was going to be guilty, guilty, guilty. Reporter felicia sanders, one of three survivors that awful night, who testified during the trial how she watched roof take her 26yearold son ta wansa. Not too many mothers ever see their son come in and leave the room. So that was very painful for me. Reporter during his closing argument, the prosecutor raised his roof in anger, calling roof a man of immense hatred and tremendous cowardice, who shot his victims while they prayed and had their eyes closed. These nine people exemplified a goodness greater than his message of hate, he said. The defense conceded the horror of the rampage, but his attorney tried to bring up his clients mental state. Hes still in here, im afraid. Reporter this chilling 9911 call from inside the church was among the evidence laid out for jurors, including racially inflammatory writings and a hit list of other churches. I wanted to do everything i had to do to make sure we get a conviction. Reporter and she did. Where dylann roof failed to start the race war he wanted, felicia succeeded in honoring her sons memory. I wear a smile. The reason i wear a smile, because if you look at the pictures of all nine, they all wore a beautiful smile. Reporter in this same courthouse, where decades ago, historic cases of segregation were decided, dylann roof now faces the opportunity of a death penalty. He says he wants to represent himself during sentencing and felicia says shes plans to testify again. Gabe, thank you. Theres new fallout tonight from a massive hack against yahoo. Private information from over a billion people stolen. The largest ever breach of its kind that has a lot of americans concerned. But experts say if you think you might have been affected, dont delete your account. Nbcs Miguel Almaguer explains what you should do and whats at stake. Reporter with the fbi investigating the hack that compromised the private information of one billion yahoo users, tonight the white house cant address the scope of vulnerable material now in the hands of cyber criminals. We know names, dates of birth, even security questions have been exposed, but more may have been lost. Experts say at least 150,000 government and military employees are also among the victims. The 2013 breach disclosed wednesday wasnt even discovered by yahoo. The fact that an outside party had to come in and explain to them what had happened, is not great for yahoo and sort of underscores their management failure. Reporter with yahoo stock sliding, verizon said its evaluating its 4. 8 billion deal to buy the internet giant. Verizon wants access to yahoo users and experts say could get them at a bargain price. We think they still want to do this deal. What are they buying . The yahoo finance, yahoo sports. Reporter but for many, the brand is tarnished. Beth cohen cramer dumping yahoo switching to google. Im fed up with it. I feel like this is the last straw for me. I cant assume theres any kind of security in place. Reporter but experts warn simply deleting your account if your account was lanked to Online Banking or social media, hackers could recreate the access, gaining access to them. So instead, change passwords and security questions. A tangled web of hacked information, exposing one billion users in ways still unclear. Miguel almaguer, nbc news, los angeles. Tonight, much of the country is caught in the grip of an arctic blast, stretching from coast to coast. After days of bitter cold, today it got even rougher out there. Al roker is up in a moment with the forecast of what else is on the way. But first we get the frigid details from nbcs ron mott. Bitterly cold air, snow, and ice, and a harsh reality tonight. Getting around, suddenly a whole lot tougher. At least 50 vehicles involved in this pennsylvania pileup. Three people hurt. Truck passed over, got into a ditch and then it started piling up after that. Reporter in oregon look out reporter scary moments when this school bus lost control. Fortunately, no serious injuries. Nice and easy. Reporter hundreds of others stuck. I why stay in my car when i could be out here helping. Reporter upstate new york, blizzard conditions. Hello, canada, thank you for the cold air. Reporter 17 below in chicago, 12 plo in minneapolis. Cleveland, 6 below. Misery that has company. All but two states in the lower 48, below freezing somewhere. In chicago the zero patrol was busy today. Driver Jason Blevins finding plenty of stranded motorists to get out of a cold jam on the illinois towaway. Not the way you wanted to spend your thursday. No, a little too cold for this. Reporter bundled up in boston. Temps in the 20s today. Tomorrow, much colder. Were in for a long winter at this rate. Reporter chicago is due for a bit of a warmup tomorrow, and then another on saturday before taking yet another plunge into a deep freeze on sunday. The forecast high temperature, lester, 1 below. Ron mott in chicago. As promised, al roker is here. What are we looking at tomorrow and heading into the weekend . We have a broughtal onetwo punch of two arctic air masses, one right after the other. Heres the first round. Friday morning, the windchill, minus 10 in billings, all the way to portland, where its minus 19. The second reinforcing blast of cold air. Pierre, minus 25. These are air temperatures. Minus 3, kansas city. 14 in indianapolis. Factor in the windchills, it will feel like minus 37. Sunday in minneapolis, 1 above. In minneapolis and minus 41 in pierre. Into all this cold air comes a vigorous low pressure system that friday moves out of the rockies into the plains. A swath of four to eight inches from rapid city to cleveland. Continues into the midwest and northeast. Look at the air flow. Take a look at the actual im sorry the actual accumulations through the weekend, on into the northeast. And in fact, just to kind of reinforce this, lester, it will be 14 below monday morning in chicago. In the south pole, its actually going to be warmer at 12 below. Dont know if that makes anyone feel better. I dont think it does, but thought id share. Al, thank you very much. Frantic evacuations have resumed in aleppo after a new ceasefire went into effect, but secretary of state john kerry said some fleeing civilians are still under attack by syrian forces, accusing the regime of nothing short of a massacre. And many of those under fire are children. Nbcs bill neely has more from inside syria. Reporter fleeing aleppo today, children under fire. One screaming for her father. There was meant to be a ceasefire as they left the rebelheld east. Yet still they were targeted. Their mothers trying to comfort them. Nearby, other children fled today. They have no parents. Orphans of the war. 47 of them, finally able to leave an orphanage riddled with bullet holes. And defiant. Relieving aleppo, he says, but when we grow up, well be back to liberate it. From their refuge, they pleaded yesterday for their freedom, led by 11yearold yasmin karmuz. Were scared, get us out. Nbc news has been following their ordeal for months. Reporter there was august. Yasmin is playing, but her teachers told us she was traumatized. Her parents, killed by an air strike. The next month, she told us, when theres bombing, i hide under the blanket. Im scared. I want to have my father, to see my mom. In october, it got worse. The orphans hit underground, the siege tightening. Today, it ended. Yasmin and all her friends leaving aleppo. Gunfire as they went. They were part of a huge convoy, thousands evacuated as the city fell to president ass assads forces. The biggest rebel defeat so far. But not the end of a war that has orphaned so many, and for some thats lasted a lifetime. And thousands more civilians will be evacuated tomorrow. The orphans are safe tonight. But theyre in another rebelheld area, which president assad has vowed to recapture. Their trauma may not be over yet. Lester . Bill neely in syria, thank you. Tonight the Egyptian Government says traces of explosives have been found on some of the victims from that doomed egyptair flight from paris that went down over the mediterranean back in may. All 66 people on board were killed. No one has claimed to have attacked the plane. Egypt says a criminal investigation is under way. Still ahead as we continue tonight, facebook crackdown. 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Those fake news stories. Fake political news. The impact of fake news. Reporter facebook wants to put fake news out of business, with your help. Today, after months of public pressure, the social media giant announcing new preliminary measures, to weed out stories that are intentionally false, and spread for financial gain. To make it easier for its 1. 8 billion users to report a hoax, they can click the upper righthand corner of a post to flag content. If enough people mark it, the story will be reviewed by facebook researchers and passed on to independent journalists to factcheck. If determined false, the piece will be marked disputed on facebook, demoted in your news feed and the creator will be banned from promoting on facebooks platform. Facebook is censoring to the extent they will cut off some sites from economic benefit. Marco chak own runs a fake news site, he says his articles are satire. If you look at that site and think its a real news story, i think thats on you. Reporter chak own welcomes facebooks new measures and doesnt think it hurts his right to free speech. Facebook is a private company, they can decide for ideological or business reasons if they want their News Platform to be used for this stuff. Thats totally legitimate and its not censorship. Reporter facebooks announcement said, we cannot become arbiters of truth ourselves, and that its targeting the worst of the worst. Fake news is not as simple as bzz, its false. But right now, theyre trying to detract the things that are obviously false and not give them money. Reporter a controversial experiment, facebook asking users to police fake news, trusting them to call it when they see it. Jo ling kent, nbc news, new york. Were back in a news, new york. Were back in a if you have moderate to severe plaque psoriasis, isnt it time to let the real you shine through . Introducing Otezla Apremilast . Otezla is not an injection or a cream. Its a pill that treats plaque psoriasis differently. 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