At least 17 french citizens were killed. Those attacks began wednesday at the office of the newspaper Charlie Hebdo. Late friday French Police raided a printing factory. The two were killed in the gun battle with police. Meanwhile, an associate of the suspects took several hostages at a kosher market in paris and he was killed as heavily armed police raided that shop. Four hostages died in that siege. Siege siege. French authorities are now searching for this woman. And the main synagogue in paris will remain closed today. It is the first time that temple has been closed on the jewish sabbath since world war ii. Lets go to more to Richard Engel on how it all unfolded. This tiny French Village suddenly became a war zone. At 9 00 local Maintenance Worker pascal heard helicopters overhead. His boss called him, he said to tell him to stay inside just doors from where the gunmen were holed up. But he went instead, to a nearby school. I gathered the children and helped usher them into classrooms, he said. At that Moment Police descended on the village. Quickly sealing it off. The kouachi brothers were surrounded. French Police Brought in helicopters. At nearby Charles De Gaulle airport, a runway was closed air traffic diverted. At 9 40 barricaded into the printing press, Cherif Kouachi spoke to a french journalist by phone. [ speaking Foreign Language ] i was sent by al qaeda in yemen, he said it was Anwar Al Awlaki who financed me. He was one of al qaedas Top Recruiters killed by a u. S. Drone in yemen in 2011. As he spoke, worried parents in the village gathered their children still hiding in the school. By Midday Police snipers were in place. French authorities decided it was too dangerous. The children had to be moved. They were taken out in small groups. 15yearold marvin said we were surprised to hear what was going on. This is such a quiet village. Then near dusk two explosions one caught on camera. The sound of gunfire. Children started running to the buses. This was the most dangerous time, but it was over in just minutes. The kouachi brothers had come out shooting. And they were quickly shot dead. Their hostage was unharmed. Richard engel, nbc news france. Lets now go to paris and nbcs ron allen standing by for us. Ron, with a good morning to you, you were on the air all day yesterday as this all unfolded. Talk about the scene there today and the reaction and the aftermath. Reporter well, alex i think people are still trying to understand, get their head around, and almost accept that this has happened. Its a day of national grief, a day of reflection a day of trying to figure out how this could have happened and what to do about it and what to do whether Something Else will happen. Theres a real concern about the threat of more attacks. There was a highlevel meeting of the government this morning. Therell be more meetings throughout the day. Security is being increased in a number of places like houses of worship. Here in the center of paris, you can see behind me there are people gathering. Its a normal day, a dreary day, a cloudy day. A lot of people will be here tomorrow, huge crowds are expected, hundreds of thousands, perhaps, for a march of solidarity, when there will be leaders here from across europe as well coming to pay their respects, to come in solidarity and support the french people in this time of its a very troubling time. On the other hand now, authorities are, of course trying to dig into the past of the culprits, of the gunmen who are responsible for this. They were known to authorities. Thats one very troubling, yet revealing aspect of this entire episode. They were known to authorities, they had within tracked by authorities at different points but for some reason they seemed to have fallen below the radar somewhat, or perhaps the other way of thinking about this is that the government saw other more greater, more imminent threats. They have limited resources to conduct 24 7 surveillance around these suspected terrorists, who are here in paris, and there are literally dozens of them here in paris and beyond across france. So the bottom line a day of reflection, a day of trying to figure out what happened and a day of trying to figure out how to move forward. And of course a lot of concern about possibly more threats. You bring up a very cogent point there, that these were known to officials as being potential terrorists. These were known some ten years ago, in fact at first count. Im going to ask my director murray to throw up another graphic that we had earlier, which shows the one person that is still being sought. And that is this 26yearold Hayat Boumediene. So what are Officials Saying about her and is she the reason that they worry about future attacks or is it a broader base than that ron . Its a broader concern, but the woman, yeah shes an accomplice. She is considered armed and extremely dangerous. She is on the run. We dont know. And its a big question mark hanging over this entire situation. There is some speculation that she was in the market the supermarket, that was attacked at some point, but thats not clear. There are reports that she may have escaped there are reports that she may have been killed. Its hard to imagine that someone in that market whos a suspect, could have escaped. The police were there, the Security Forces were there relatively quickly. There were a lot of people in the market, however, a lot of employees, a lot of shoppers, because this is a time when the markets would be filled with shoppers gathering food and other supplies for the weekend and so forth and for the jewish holy day, the next day. So a lot of confusion about what had been going on in the market but very unlikely that she escaped. She is considered armed and dangerous. But the other concern, i believe, is more so about the links, the connections that the kouachi brothers have with other terrorist organizations, particularly al qaeda in the arabian peninsula, and others here in paris and in the area. Again, this is perhaps this is one of the cells that we think of that has perhaps been reawakened. But its really just a collection of individuals who are disaffected, who are angry, who are armed, who have gone in some cases, for some training and who are, as we saw yesterday, capable of creating mayhem and just utter horror in the streets of the city. So again, france is well aware of this endemic problem with the threat of terrorism, but has been brought into incredibly broad relief in the incidents over the past couple of days. Authorities are really right to get to the bottom of this and figure out what further threat remains and what to do about it. Yeah. And interestingly, the time ryan of these two sieges they believe they were connected. They know that these three terrorists knew each other. But another facet of that is that this woman, Hayat Boumediene, she allegedly made some 500 phone calls and texts to a woman described as the wife of one of the kouachi brothers i believe it was said. I mean has that been definitively proven that there was a connection, that she may have been like a gobetween . Reporter well theres not necessarily a gobetween and its not necessarily been proven or revealed exactly what the extent of the connection is but these are people who know each other. These are people who live in the same community. They have relations that go back many, many years. One of the kouachi brothers and the other suspect were in prison together, which is where we believe they met and may have been radicalized or may have certainly, formed an association. So its best to think of these individuals as very connected. They know each other. And they know other people. And authorities knew them and in recent days authorities have revealed that they have been really keeping under surveillance dozens of others who are from the same communities, who are related to these individuals, and who are capable, perhaps, of the same kind of violence. So this is really an ongoing threat that again, exploded exploded yesterday over the past couple of days yesterday and over the past couple of days. But the question is who else is out there and what are they capable of and will Something Else happen . Absolutely. Ron allen, thank you very much for the live report from paris. I know well be speaking with you again today. And as ron was saying the key word there is ongoing. Certainly, the sieges in france are over but this morning, there remains more questions than answers. How did the Charlie Hebdo shooters get out of paris . Where is Hayat Boumediene . And how did she escape the Grocery Store . And is there a threat of copy cat attacks . Joining me now, retired special agent in charge and Hostage Negotiator, Jim Cavenaugh and an msnbc analyst. Jim, are you concerned about copy cat attacks or other sleeper cells taking this moment to come forward . I am alex good morning. I think thats a real possibility, not only in france but i think worldwide. You know the terrorists have always benefited from a thing called the propaganda of the deed. You know they use that in suicide bombings. You know we would all think, you know, in looking at it someone puts a bomb on themselves and blows themselves up, who would want to do that. But they leverage that to recruit more people. They recruit more people through the propaganda of the deed. And then someone can copy the behavior. So not only in france certainly there, but worldwide as well. Yeah. Look hindsight is always 20 20, but do you see it as a failure of policing that the two brothers were able to get out of paris after the initial shooting at the magazine . Well not really. Well, let me say, there is some problems there, i think. One of the things is in any big city center certainly, all modern Police Forces have to be able to put a Police Rifle Team quickly, at any part in the downtown area of the city within minutes. These guys had way too much time to get away and a patrolman on a bicycle with a handgun is not going to be able to stop two or more people that have rifles. So its imperative that the worlds, especially major city policing, where we know the threat is there, has to be able to do that. You dont have time to call members of the s. W. A. T. Team in or the Tactical Team in. You have to have that Police Rifle Team. Many departments have it but it wasnt effectively deployed in paris after the Charlie Hebdo massacre. And Hayat Boumediene, she, of course, remains at large today. There is some speculation that she may have escaped the Grocery Store as posing as a hostage. In all the chaos of that moment jim, what do you think could have been done to stop her . Right, well its not unpress didnt dented that hostage takers can slip out disguised as a hostage, maybe even change their clothes. She could have been sent in early, to reconnoiter the place. So the shoppers wouldnt even know, necessarily, who she was. So she could have been in there. Also, your on the about her texting and communicating, you know, i think that could be a real part of the operation. You know acting as a radio man, if you will. And maybe, you know, females on the other side with the brother. So you know call the brothers and tell them this text the brothers and tell them that. I think that very well could be. And do you think that that may have led to the simultaneous raids on both the printing job and the Grocery Store . Yes, yes. Because what happened at the printing shop was, the brothers came out. So once theyre separated from any hostage or believed hostage thats in there, you know the Tactical Team is going to engage them. Whether or not they even engage the Tactical Team. If they came out front, you couldnt let them go back in if you thought there was one hostage in there. Because you might not ever get another chance to engage them. And if you couldnt be certain that the people at the Grocery Store would not see this on the media or get texts on this on their cell phones, then you would have to move there as well, and, you know, get in and engage them. And apparently he did engage the tactical officers when he entered, and maybe wanted to detonate some explosives he department get to, so the operation was successful. Jim, ill have you back later in the hour well talk about the kinds of explosives and ammunition they used the weaponry, pretty extraordinary. Thanks so much. The world, of course unites on this as france continues to recover from the worst attack on their soil in decades. U. S. Attorney general eric holder and others head to france sunday to attend a unity rally and what president obama had to say about this weeks assault, next. Make a lot of purchases for my business. And i get a lot in return with ink plus from chase. Like 50,000 bonus points when i spent 5,000 in the first 3 months after i opened my account. And i earn 5 times the rewards on internet, phone services and at Office Supply stores. With ink plus i can choose how to redeem my points. Travel, gift cards even cash back. And my rewards points wont expire. 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Two raids yesterday at an Office Complex north of paris and a downtown kosher market effectively ended the siege killing three of the four suspected terrorists. 17 french citizens were killed in the attacks which began on wednesday. President obama has been in close contact with french officials dealing with this terrorist attack. And in his speech yesterday in tennessee, the president reiterated the u. S. support for france as they deal with this tragedy. I want the people of france to know that the United States stands with you today, stands with you tomorrow. Our thoughts and prayers are with the families who have been directly impacted. We grieve with you. We fight alongside you to uphold our values the values that we share, universal values that bind us together as friends and as allies. The president said he directed u. S. Law enforcement and counterintelligence operations to provide whatever support the french government needs. And back in paris now, were joined for the latest on the investigation by nbcs cassandra bene benegrad. I know youve been talking with people in paris today. What are you hearing about their main concerns . Reporter people in paris are still in shock, to tell you the truth. This has been the bloodiest three days on french soil in decades. And as you can probably see behind me, people are gathering here to pay their respects to the victims and show solidarity but theyre also wondering what might come next. Theres still a suspect on the loose, and some people are telling me that they fear that more attacks are imminent. Cassandra, tell me about the place where you are standing . What monument is behind you . This has been a rallying point for people over the last several days. There have been several vigils and marches originating from here and its plastered with posters and photos and candles and tributes to the victims who were killed in the initial attack on the offices of Charlie Hebdo. And cassandra, with regard to the hunt for the fugitive suspect, this Hayat Boumediene a 26yearold, any details being released by police on where theyre looking or any kind of information like that . Reporter like much of the investigation over the past several days theyre really keeping the details quite close to the vest. But they have issued a photo of her and are asking anyone with information to come forward. At the moment theyre just doing everything they can to reassure the French Public that extra security measures are in place to protect them and ensure that this wont happen again. All right. Nbcs Cassandra Vinograd from paris, thank you so much for that. There will be an extraordinary rally there tomorrow, all in unity and support of all those parisians and all they have suffered, attended by leaders throughout the European Union and attorney general eric holder will be sent over, representing the United States. Joining me now from paris is ronan taffaro. I know you just arrived there in paris, but give me a sense of the feeling. Even going through the airport, was there extended security there, ronan . Reporter it is of course much more tense here. Its a grim day, but a quiet one. You can see behind me its calm now. The site of so many demonstrations is now sort of eerie. People are going about their weekends, but, of course as cassandra noted, its ominous here, people are afraid. You mentioned, eric holder is on his way to france. Theres also more activity on the government levitt happening. A ministerial meeting just this morning abou