This is nbc nightly news with Brian Williams reporting tonight from washington. Good evening, the world is reacting tonight to a terrorist attack in one of the great world capitals that prompted an urgent manhunt and a frantic effort to identify three men. Today in paris in broad daylight masked men entered the Editorial Office of a satyrical magazine and they were shooting to kill. The death toll reached a dozen, including two Police Officers before they made their getaway, prompting the manhunt. Several dead were editorial cartoonist. One wanted by islamic extremists for depicting the prophet mohamed in a negative way. In paris people have filled the street in solidarity. This is being felt in all the capitals here in the u. S. Capital city and indeed around the world. We begin with bill nellely in pas ris to start us off. Reporter police now naming three suspects and a Police Operation reportedly underway not far from here. This is a country in shock. Those are the words of the french president. And many here are afraid the gunmen could attack again. Heavily armed and shouting in arabic god is great, masked gunmen carrying out a massacre in paris. Theyre outside the offices of a magazine which theyd stormed. Inside 11 people mostly journalists, lay dead. Minutes later more killings as Police Officers confront the gunmen. One walks to a wounded officer and shoots him pointblank. As the gunmen begin to make their escape we told you we would avenge the prophet mohamed, as they return to their car one gunmen calmly picks up his shoe. Their target in the heart of paris was a satyrical magazine Charlie Hebdo religious leaders including the prophet mohamed. A clash of police a right versus a religion that depicts any good or bad of the prophet mohamed. The gunmen forced their way past security killing one man at the door. Upstairs at a meeting of the magazines staff the gunmen opened fire killing editor stephane and several cartoonists, one 80 years old. Its like a butchers inside there, this man says. There are so many dead. The assault lasted about five minutes. The gunmen seemed fearless and made their getaway quickly, later hijacking another car leaving the bulletridden black citron behind. The magazine had been attacked before. An attack that didnt stop it. Journalists here are shocked and angry. It is an outrage and a major attack on the freedom of the press. Reporter french president Francois Hollande says the country is in a state of shock but must unite. Tonight theyre doing just that. Police have identified three men as suspects two brothers in their early 30s and an 18yearold. No arrests have been confirmed. And no one is yet claimed responsibility for frances worst terrorist attack in decades. And, brian, some very late word literally within the last minute and a half a senior u. S. Counterterrorism official has told nbc news that one of the suspects has been killed and the remaining two are in custody. That may well be as a result of that operation in a city about 90 miles from here. Remember two of the suspects were brothers. And it was suspected that at least one of them had returned from syria last summer. This remember frances worst episode of terrorism in 54 years. Back to you, brian. Bill neely starting off our coverage from paris tonight. Bill, thanks. Our chief Foreign Affairs correspondent Richard Engel has covered attacks like this groups like this for many years. He is part of our team of coverage on this story tonight. Richard, good evening. Reporter dressed in black, masked determined cradling their weapons. The gunmen look like seasoned veterans who stepped right off the battlefield of iraq syria or yemen. Or at the very least are mimicking the propaganda videos of militant groups to a t. Al qaeda and isis both place a growing value on propaganda. Not just as advertising, but to turn their supporters into deadly weapons. Both groups publish slick competing online magazines in english. Both have been telling wouldbe recruits not to come to the front lines in the middle east anymore but to stay at home and attack civilian targets. Al qaedas branch in yemen, the same group that killed an american reporter last month, specifically marked the editor of Charlie Hebdo for death in 2013. His magazine has infuriated for printing antiislamic material repeatedly. Al qaeda in yemen said it would make the magazine pay for it. Also on its hit list other activists who criticized radical islam including long time target solomon. In a statement he said i stand with Charlie Hebdo as we all must, to defend the art of satire which has always been a force for liberty and against tyranny, dishonesty and stupidity. There has been a spate of recent attacks. The gunmen in canada the man with an axe in new york the attack on a cafe in sydney. All inspired by islamic militants to take matters in their own hands. The more the greater the impetus is for others to carry out an attack. Reporter this time radicals consider an affront to their intolerant ideology. And, brian, at least one of those three suspects one of the two brothers was a wellknown Islamic Radical whod actually been convicted in 2008 on terrorism charges. Brian. Richard engel, part of our coverage of this story tonight. Richard, thanks. We want to bring in michael lighter former under both president obama and bush. He is executive president for a Security Firm that does work for the federal government. What was your government experience what was your first thought upon hearing this news today and anything about it indicate we could be in for more . Well i think from what we saw these guys were pretty sophisticated, brian. This wasnt the runofthemill home grown where they do one stupid thing with an axe. They were organized. They knew their target. They knew how to get away for a period. Thats a level of sophistication we havent seen. I think what is most telling here is really how vulnerable these soft targets are to these sorts of acts. And whether well see more, i think success, unfortunately, breeds success. Wherever the al qaeda message is coming from syria or yemen, is gaining traction in many nations including in france. So safe to be on alert a little bit higher degree here in the United States . I think so. I think were going to see elevated levels of security in cities like new york washington los angeles. And thats appropriate. Because other people who are on the edge see the success and say i can be like that too. And organizations like isis and syria understand how to use social media and motivate and drive these people towards mobilizing and making these sorts of attacks. Michael, thank you for being with us here in our Washington Bureau tonight. Now to the response from the white house and the Obama Administration on this side of the atlantic. Our White House CorrespondentKristen Welker is on the north lawn for us tonight. Kristen, good evening. Reporter brian, good evening. Late today president obama called french president hollande from air force one offering condolences and the full support of the United States. Homeland Security Secret Service and pentagon Officials Say there is no known domestic threat. Still, administration Officials Say the paris attack is a reminder that terrorists will strike anywhere. Officials in some major cities including new york and boston have beefed up security today. The president called france one of americas oldest allies and condemned the attacks. For us to see the kind of cowardly evil attacks that took place today, i think reinforces once again why its so important for us to stand in solidarity with them just as they stand in solidarity with us. Reporter secretary john kerry echoed mr. Obamas remarks, speaking in english and french. Each and every american stands with you today not just in horror or in anger or in outrage for this vicious act of violence. Reporter now, u. S. Intelligence officials have been in contact with their french counterparts throughout the day. The president on the road for three days will receive regular briefings. Brian. Kristen welker from the white house north lawn tonight. And just to repeat in a short time ago we learned from senior u. S. Counterterrorism officials they are telling nbc news of these three masked men sought all day, one is dead two in custody. Well continue to follow this story. In the meantime also overseas theres been a major break in the investigation into the crash of airasia flight 8501. They have located the tail section of the airbus a320 about 100 feet down on the ocean floor. The tail section is critical here because thats where the black boxes are stored. They contain the electronic clues to this crash. We get the very latest tonight from nbcs Kelly Cobiella in indonesia. Reporter its the first visual proof that airasia flight 8501 is on the bottom of the sea. Three pictures of the tail section. You can see part of the Registration Number and the a and i from the insignia. The black boxes could still be inside. The flight data and cockpit voice recorders are typically found here. Its the first place searchers will look. The flight data recorder collects hundreds of data points including the planes air speed and altitude. The voice recorder will tell investigators what the pilots were talking about. And if any alarms were going off in the cockpit moments before the crash. Until we get the flight data recorder and the cockpit voice recorder we wont get to the bottom of this entire event and really understand how the crew got themselves into it and how they reacted to it. Reporter it was the black boxes from air France Flight 447 found on the ocean floor nearly two years after the 2009 crash that helped identify the cause of the accident. If airasias black boxes have fallen loose, searchers can still spot them on sonar. Already theyve spotted 12 large objects below the surface, but strong currents are stirring up silt and mud. Its so murky divers are having problems seeing under water. Today, airasia founder tony fernandezfer nan nan nandes tweeted searchers are hoping theyve already located the fuselage on sonar and theyll be able to recover the remains of those passengers and crew still missing once the seas are calmer and clearer. Brian. Kelly cobiella live for us in indonesia tonight. Kelly, thanks. And still ahead for us tonight, the nations weather in the news once again. Blinding cold with a dangerous mix of ice and snow triggering pileups and rescues, triggering watches and warnings. Also the amazing show happening just offshore. 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And theres more on the way. Tomorrow will bring the coldest temperatures we have seen yet in a lot of places which will now go to subzero. Our report tonight from nbcs Kevin Tibbles in chicago. Reporter fierce blowing snow coming from the arctic north causing pileups in michigan. Hazardous conditions in erie, pennsylvania and thermometers frozen at 7 below in waterloo iowa. This morning temperatures dipped below zero in 15 states. With windchills making it seem even colder some School Closings reported in more than a dozen of them. Overnight firefighters battled both the weather and the flames outside chicago. The first half hour we were here we were not able to get water. Reporter come morning in the windy city commuters sought to underground pedestrian walkways just to escape it all. Oh its a godsend. Its like a godsend. Reporter the Police Outreach team offers those outside offers winter clothing and advice on where they can go to warm up. Whether we can talk them into grabbing a blanket and an extra hat for the night. Reporter rescue workers pulled an indiana woman and her dog from frigid waters after she fell in trying to save her pet. And while the deep freeze continues, some 200 Million People are forced to tough it out. Another round of snow will race through the midwest on thursday and make its way into the northeast by friday. Windchills thursday morning up north will range from about 20 to 30 below zero and down south will be close to zero. Reporter in fact it will quite likely be warmer tomorrow in tiny north pole alaska than it will be in parts of the lower 48 as this frigid january sloth drags on. And, brian, a deadly pileup in whiteout conditions in pennsylvania has killed three. And while temperatures are supposed to slowly jump start themselves and start rising by some time by the end of the week it probably wont happen in time to reopen many of those closed schools. Brian. 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