United states. And here in europe, it was a day of Police Operations and the hunt for an accomplice and the mastermind of the attacks. We have extensive verage of this unfolding story. Lets start with bill l neely. Repepter this is the man france believes was behind the paris massacres. This isis propaganda video is sent to show abowd, o oe jailed in belgium and now believed to be in syria. What you cant see behind his vehicle are the bodies hes about drag on ropes. He was close to at least two of the paris killers. Police are still hunting for this suspected accomplice salah abdeslam, who they describe as dadaerous. His brother believed to be one of the killers, another brother questioned and released after police raided the family home in brussels. Moree attacks on france are being planned. The french Prime Minister warned today. Which is why police raided more than 160 homes, arresting two dozen suspects and seizing dozens of guns and a rocket launcher. The french president addressing lawmakers, vowed to destroy isis. Dering a french Aircraft Carrier closer to iraq and syria. A dozen french war planes hit isis overnight. Bombing its strong hold of raqqa, syria, in the biggest french raid so far. In paris today, not the noise of war, b silence for,the citys victims. Millions remembering, though they cant forget. Praying, too, for the critically ill. Dozens of vikes remain victims remain critically ill,l, clinging to life at this and other paris hospitals. Shot multiple times and say doctors, utter utterly traumatitid. I never received 50 patients together. One surgeon who served in afghanistan, said hes never seen anything like it. It must have looked like war here. It was a feeling of war. Reporter franciss Muslim Leaders condemned the killings and honored the dead today and sent a message to isis. Whatever you dodono matter how long g takes, we will beat you. Reporter and it is not just French Police investigating this. It is police in germany, spain and belgium. Anan intelligence agencies in britain, israel and the united states. Isis now a global threat, lester, demanding a global response. Bill, thanks very much. Isis is raising alarms at home in the s. By releasing a new propaganda video that threatens an attack on washington, d. C. But as nbc News Foreign Affairs correspondent Andrea Mitchell explains, president obama hasso intention of changing these militants on. Reporter todays new isis video says america is next. The trorist said, ass we struck france in the center of paris, we swear we will strike america at its center in washington. Is the threat real or propaganda. Today a Carrier Group living virginia for the mediterranean, a planned mission focusing on isis. And tonight the u. S. Is stepping up airstrikes in syria. But even now with isis proving it could strike terror in the heart of europe, president obama sounding defensive today, sticking to his game plan. The terrible events in paris were obviously a terrible and sickening setback. Even as we grief with our grieve with our french friends, we cant lose sight there has been progress being made. Reporter firing back at critics the strategy that we are putting forward is the strategy that ultimately is going to work. Reporter the u. S. Has begun sharing more intelligence with the french, who are so on edge, a false alarm two o ys later caused panic. And isis capability and u. S. Intelelgence never predicted. I dont consider it as oneoff event. Isil has an external agenda that they are determined to carry out these types of attacks and so i would anticipate this is not the only operation that isil has in the pipeline. I dont want to make everybody nervous. But i feel the same way i felt before 9 11, that something very real, very well could happen here. Reporter so how to stop isis. Experts say more air power, more effective naval power. And several thousand special forces, not just 50. Direct action, against isis, wherever they may be. In syria, iraq or lebanon or where ever on the face of the earth. Reporter and diplomacy this weekend with putin. Figuring out whether isis could do to washington what it did to paris. Tonight secretary of state kerry arrived in paris to light the u. S. Embassy in the colors of french flag in solidarity. He said tonight we are all parisians, even if he called isis psychopathic monsters. Lester. And security is stepped up in the u. S. In the wake of the attacks here in paris. In coast to coast officers are out in force in a number of cities, including new york. Which as Stephanie Gosk reports, just unveiled a new weapon in the battle against extremists. Reporter the nypd said this specially trained strike force is the citys new frontline against terror. You are here not a moment too soon. Reporter the unit hit the streets for the first time today, where new york city Law Enforcement is already in a heightened state of alert. 500 ofofcers dedicated solely to responding to terror attacks. The plan was in place before the tragedy in paris. Today there was new urgency. Is there an aspect of this attack that you find most troubling . Definitely. Every one of them quite intended to die. Reporter there are no threats against cities in the u. S. But there has been a visible increase in security. Having officers there, and in plain sight, visible with long weapons, can be a visual deterrent to somebody that might be looking to launch an attack. Reporter in d. C. , Capital Police stepped up patrols. And nfl stadiums are on high alert. Tennessee in cincinnati, more bombsniffing dogs. In cincinnati, the police chief said they are ready but admitted there are limims to what they could do. It is hard to stop individuals willing to reporter later in week, the nypd is sending a special team to paris. One focus will be the suicide vests lester, they want to know how powerful they were. Stephanie, thank you. As the investigation advances here in europe, were continuing to leaea more about the seven attackers who died in the assault here. Our chief Foreign Correspondent Richard Engel looks at who they were and how they traveled and how one of them may have been radicalized. Reporter as investigators sift through the evidence, we followed in the attackers footsteps. Which led us first here to the quiet town of charte, where one terrorist lived. The mayor told us that one of the rock concert murderers had associated witit radicals at a nearby mosque. He was radicalized slowly and then in 2012, he left town, the mayor said. But when we went to the mosque, the didnt know anything about the man. But he was known in town. And not always as a devout muslim. Seen here in this you tube rap video. Another suspect, 31 years old, who explodes his suicide vest at a cafe and connected to the man who may be the most wanted man in europe tonight. His brother, salah, who rented a aar the killers drove in paris and then after being stopped at a check point, drove back into belgium and disappeared. Isis h h a habit of lling the w wld where et cetera next move is going to be. And the world has a habit of ignoring the threat. This is a message to canada. . July of 2014, in a video message. Isis said it would attack canada. Four months later, the Canadian Home was attacked. Today isis released a new video in which it called on muslims all over the western world to use any weapon they knife, a gun, a car, even their bare hands to kill. It is a repugnant message but one that western intelligence agencies are paying closer to attention to now. And one of the things causing the most concern here is that we know that at least one of the attackers did, in fact, hide among the refugees who are still flooding into europe in the thousands. Mostly uncheckeke every day. Lester. All right. Richard. That leads to the next story. A growing number of governors want to close the door to refugees in the s stes after the revelation that a syrian passport was found near the body of one of the attackers. 2,000 Syrian Refugees have entered the u. S. In the last four years and as Hallie Jackson reports, the issue is heated on the campaign trail. Reporter caught up in the isis battle. Syrian refugees at the center of a pololical one in the u. S. More than a dozen republican governors and one democrat now refusing to accept any refugees from syria. In some cases until after a security review. And i think the concerns are warranted in this time the french say this is war. You will not roll the dice and take the risk on allowing a few refugees in simply to expose texans to that danger. Reporter now with the hashtag trending on twitter. New questions about whether states are allowed to refuse refugees. Whether they could legally do that, dont have an answer for you. I dont. I think our lawyers are looking at that. Reporter republicans staking out a tough position with i ages of the paris attacks now top of mind for americans. But just two months ago, it was the image of this threeyearold syrian boy who drowned looking for a better life. Today Chris Christie reportly telling a radio show, no Syrian Refugees, now, not even threeyearold or fans because he lacks confidence in the vetting ability. The`u. S. Turning it back on those suffering the most. That is not what we would like to do. The best thing we could do is bring isis to an end. Reporter on capitol hill, congress to stop paying for settling r fugees here. And in the race for the white house, g g candidates addddg to it. We have no idea who these people are. We are the worst when it comes to paperwork. This could be one of the grt trojan horses. They all must go through a security screening, a process that could take years. President obama wants to allow 10,000 in over the next year. Hillary clinton supports more. The debateow just beginning. Hallie jackson, nbc news, washington. We have a lot more to cover. Just ahead from paris, we go inside of the horror at the concert hall. New images just coming in as we hear a chilling story of survival. How strangers crowded together in the dark in total silence, barricaded behind a door as so many were massacred on the other side. You total your brand new car. Nobodys hurt,but there will still be pain. Threequarters of what it takes to replace it. What are you supposed to do, drive threequarters of a car . Now if you had Liberty Mutual new car replacement, youd get your whole car back. 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And a shocking image from after. The horrifying carnage. So many bodies on the dance floor covered with blood. Tonight we hear from a survivor who ran for cover as the gunfire began, terrified and hiding for hours behind a barricaded door. The terrorists on the other side. It is a great picture. People having fun. Yes. For dennis, friday nights visit to the bataclan concert hall was a rare chance to see his favorite band. How far into the concert before something happened . It. So, they started at 9 00 p. M. And they played until 10 00 p. M. And then we heard, like, some fire crackers. And so i ran into the staircases and found a little tiny room where i hid with some other people. Reporter the group of about 15 people barricaded themselves inside, pushing a refrigerator against a door and they waited. Tending to a wounded woman and listening to the chaos. What could you hear while you were in the room . The machine guns, then silence. Then shooting. We just turned our phone off. We tururd the light off. And tried not to make any noise. Did you think that you were going to get out alive . No. I was i didnt. Dennis said when the police finally arrived, the terrorist terrorists, still shooting, run up the stairs toward the hiding place. I could feel the impapa. I began finally to accept death. In darkness, they waited three hours before being led from their hideout. Only to witness the horr left behind. It was a massacre. There were bodies and blood, there were pieces of brain everywhere. Everywhere. How has this changed you and how you view life . I had a closen counter with death. I wi not say im used to thut, but i have a little experience with that. Doesnt know the name or anything about the woman who was shot and in that room with them. He is desperately trying to find out who she is and how she is. When we come back in just a moment. 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And i dont believe the federal government should be making a profit off of lending to young people who are borrowing to be able to get their education. We have got to make collegeg affordable. Im Hillary Clinton and i approve this message. Were back from a city, paris, a city scarred by terrorist attacks, claimed by isis. American Officials Say the strongest defense against attacks like these happening in the u. S. Is good intelligence. It sounds obvious, but it is not easy. Because as Pete Williams explains, the fbi said it is getting hard to monitor communication between terror suspects. A problem the director of t t fbi calls going dark. So u. S. Intelligence officials dont yet know how the plotered kept in uch. One officiallaid he would be shocked i i they didnt use some method of communication that the police cannot monitor. Counterterrorism officials tell nbc news that isis has been running a 24hour help dask, m mned by half a dozen senior operatives. They could tell jihadists how to use software. Investigators say when isis recruiters find someone sympathetic through twitter, the conversations are shifting to those applications which encrist a message at t the most it is sent and dont unscramble it until it is received. Impossible for the governor to monitor even with a court order. What we are talking about is a deadly game of cat and mouse, where we have a learning, changing studious enemy. The applications could delete a message soon after it was sent. I sent this one to delete after four seconds. Im sending to my colleague, lauren. Four, three, two, one, it is gone, forever. There was a warning before the attack of another way of alluding attacks. Including gaming consoles, with the playstation 4 with h e capability could be used to send voice and text messages, hard for the government to keep track of. I heard the most difficulty between the terrorists is the playstation 4. Itits very, very fficult for our services. Reporter the problem, the online groups come and go so quickly. One cyber expert called it security by obscurity. Pete williams, nbc news, washington. When we come back, the resilience of the people of paris and honoring those who lost their lives in the attacks on this great city i built my business with passion. But i keep it growing by making every dollar count. Ats why i have the spark cash card fromomapital one. I earn unlimited 2 cash back on everything i buy for my studio. Of dollars each year going back into my business. Thats huge for my bottom line. Whats in yoururallet . dramatic music centrum brings us the biggest news in multivitamin history. A moment when something so familiar becomes something so new. impact on metal introducing new centrum vitamints. A multivitamin that contains a full spectrum of essential nutrients you enjoy like a mint. New centrum vitamints. Go to centrum. Com for a 4 coupon. 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Swollen ankles; extreme fatigue; constipation; rash; or muscle or joint pain, as this may keep these problems from becoming more serious. The are not all the possible side effects of opdivo. Tell your doctor about all your medical conditions including immune system problems or if youve had an organ transplant, a chance to live longer. Ask your doctor if opdivo is right for you. Bristolmyers squibb thanks the patients and physicians who participated in the opdivo Clinical Trial. The city of light, as you could see, is for now the city of candle light. They glow by hundreds, maybe the thousands at the site of each massacre that occred on friday, honoring the more than 300 people that were hurt and of course the dead. 129 men and women killed. Among them, nohemi gonzalez, the 23yearold american who was in her last year at cal state bong beach. She worked for months to save enough money to study abroad in paris. Nick alexander, known as han some nick. He was selling merchandise for the band at the bataclan. His family said he was generous and fearly yal. And mitchelly jameez living with her fiance, they were engaged three weeks ago. Not far from here, the line of visitors have returned to the eiffel tour, open again for the first time s sce the attacks. And awash in the colors of the french flag, red, white and blue. And here at the plaza, in addddion to the candles and the keepsakes, there are messages written in chalk. There are hundreds of them, in many colors, and in many languages. One nineyearold boy named lucas came with hi grandfatherero add his own thoughts to the thousands already scrawled there. France and the entire world. Love always wins. A place of memorial but you could see also a place of healing in paris. That will do it for us on this monday night. Im lester holt. For all of us at nbc news, thank you for watching and good night. In court today, less then 12 hours after he allegedly stabbed a man to death in a motel room. Plus nine people are left wondering where they will liie after a fire leaves their duplex damaged. And after a series of terrorist attacks that killed at least 129 people and injuring hundreds more, tonight, we hear first hand accounts of he attacks ffom two eastern iowans one who was in youre watching kwwl, weve got you covered. This is the news at six. Good evening everyone, im ron steele. And im amanda goodman. Thanks for joining us. A man is dead after a stabbing at an eastern iowa motel. The stabbing took place early this morning, at the cedrel motel in cedar rapids. Police arrested and charged this man Michael Lehman with first degree murder. Kwwls Kristin Rogers was at the linn county courthouse this morning where lehman made his initial we kw police were able to take him into custody on the scecee he was arrestt inside of his room and is being charged with first degree murder. Lehman appearing in court through this television scrn. Are yo working right now . No. Okay. The court appeperance and arrest came quickly after ten hours after authorities were called to the seen the suspect