Europe and the United States will be among the hundreds of thousands who are expected to join antiterror marches throughout france. Meanwhile, French Police continue their search for hayat boumedien, suspected of being an accomplice in yesterdays supermarket attack in paris as well as the thursday shooting of a French Police officer. Senior officials held an emergency meeting to discuss new antiterror efforts. The interior minister saying security precautions will be stepped up at certain institutions. At least 17 french citizens were killed in the terror attacks. Three suspected terrorists are dead. One still being sought. The attacks began wednesday at the office of the newspaper Charlie Hebdo. Late friday police raided a printing factory where the two suspects in wednesdays shootings were holed up. Those two were killed in the gun battle with police. Also on friday an associate of the suspects went into a kosher market in paris. Four hostages died. Police said they were killed by the gunman. Lets get to Richard Engel who joins us live from paris. Richard, weve all become very familiar with you and your routine covering the aftermath of terrorism in the middle east for us. Compare it to the situation in paris right now. Reporter there is a sense of shock here in paris. This is not gaza. This is not afghanistan. This is not the kind of thing where you have heavily armed gumin with ak47s dressed in black going into the streets, entering into that newspaper and gunning down the staff and moving on and taking hostages and having his associate go in and taking over a kosher market. That is not the kind of thing that has been happening here in paris. Theres a lot of anger, there are some questions about how this could have happened. And there is grief. Tomorrow a vigil is supposed to be held a march that is going to go through right in this square where i am right now. There have been people coming here and laying flowers. The city is also on edge after this traumatic event. Today there were two false alarms. There was one report earlier in the day that there was a gunman who was spotted near a metro station and then there was another report of a possible attack on a synagogue. Luckily both turned out to be false alarms. But there was a lot of tension. People started scrambling. And thats the mood that is still here. This city has not calmed down yet after this tragedy. You can imagine, and in part that lack of calm might be fueled by the fact that authorities are still looking for this hayat boumedien, this woman accomplice particularly the Grocery Store terrorist there. What is the latest on that . Reporter the latest on that is a lot of confusion. She is the shes been described as the spouse. Other times described as the partner. But they shared an apartment, hayat and the kosher Grocery Store attacker. Earlier today the interior ministry put out an appeal to the public again releasing her photograph with a tips number asking people to call in. Then a short while ago, the respected french newspaper le figueroa said that perhaps hayat left the country, not today but left the country a couple of weeks ago before the attack traveling to madrid and istanbul implying that she was aware of what was about to happen and decided to skip town. So right now, we really dont know very much about her whereabouts or her possible involvement. But we definitely know that french authorities would like to speak with her. Yeah, at the very least. Nbcs Richard Engel there. Thank you very much for that. Lets bring in chapman bell joining us from outside that kosher Grocery Store, one of the sites of yesterdays siege. There was some Police Presence there earlier today. How do things look now . Reporter alex good evening from a rainy night in paris. The Police Presence has actually grown. Crowds are braving the rain coming here to pay their respects. Were expecting more people later. The French Interior minister is expected to come here to pay his respect. The memorial here has grown throughout the day, flowers have been laid candles, the phrase je suis charlie, thats been used so much throughout the days for the journalists killed at the Charlie Hebdo offices has now evolved. Were seeing now i am police i am jewish everybody the unity here is growing. Everyone in france and in fact across the world is coming together in mourning these tragic incidents here in paris hoping the worst of it is over and it can come to terms with whats happened. As i said, this crowd continues to grow. Security is tight in anticipation for coming here on this evening. Alex . Chapman, im sorry to ask you one more question despite you being in the rain there. Very quickly, a lot of the increase in population there is probably because its the end of the sabbath day. Its a kosher market its a heavy jewish neighborhood. Is that what you might account the increase in foot traffic and people laying flowers and memorials there . Reporter thats correct, alex. They are expecting after chabot to have a huge number of people. Soon were expecting more people to be here to pay their remembrance at the kosher supermarket. Chapman, go get dry. Thank you very much for the live report there. As youve heard, there is a palpable level of anxiety today on the streets of paris. It is a feeling that new yorkers who lived through 9 11 may well remember. Security forces in france can now take a page from the nypd playbook. Theyre trying to secure a bustling metropolis without interrupting daily life. Joining me is Christopher Dickey who straddles new york and paris, covering this story for us from paris. Christopher, im glad to have you speak here. You have a very unique perspective. Lets first talk about whats happening in france first. Youve been writing about the investigation into who these terrorists were the depth of the network from which they came. These attackers were on the french Intelligence Communitys radar for as long as a decade. So was this a miss . It definitely was a miss. It was a huge miss. The biggest problem is not just that they were on the radar. There have been a lot of people on the radar. The french Intelligence Community has been saying ever since the names first appeared yes, we knew about these guys but we cant follow everybody. We thought they were going to be okay or at least they were not highrisk targets. And they missed one crucial fact. These guys went to yemen and trained to be the kinds of killers that they became. If you have people who are known jihadist backgrounds who have wanted to go fight and kill americans in iraq since 2004 or 2005 who have a vocation to be suicide bombers as younger men and then they go to yemen and hang out with al qaeda in the Arabian Peninsula and come back to france and you dont stick to them like glue, then you are making a huge mistake. And i dont think anybody has really explained adequately yet how that happened. It may be this is speculation. We dont have good answers yet. That the americans knew these guys had gone to yemen but somehow the french did not know that these guys had gone to yemen. Would you then classify them as a reawakened sleeper cell . Not exactly a sleeper cell. One of the foremost experts on terrorism and criminology here said no the problem is not they were a sleeper cell implying they were living anonymously, nobody knew what they were up to that somehow they fooled the world about their intentions. No, this was known to be a collection of guys with a lot of relationships with very very famous infamous terrorists not only in france but in great britain. And they were not living under cover. They were not hidden away. And yet they were not observed well enough to keep them from carrying out the worst atrocity in france in 50 years. Christopher, i want to reference your book that you wrote securing the city. It concludes that new york has one of the most effective Terrorism Task forces around. Will paris look to new york now as a model for what comes next there now . Theyre already talking about that. Of course the systems are very different in france and in the United States. New york is essentially a huge metropolitan police force. France essentially has two National Police forces the National Police and the national gendarmes. They have a lot of resources that they can deploy in a very different environment than new york. But what they are going to do certainly is the kinds of surveillance that the new York Police Department has been criticized for. And france to some extent already had in place. Its a twoway street. In fact a very Senior Adviser to the French Police was also an adviser to the new york city Police Department. And the new york city Police Department learned a lot from the french. In fact they had for many years an officer an nypd officer stationed in the Intelligence Division of the National Police here in paris. I well remember in the days immediately following 9 11 there was just a fear that permeated new york city and everybody was on edge for quite some time. In fact in just these 24 hours there where you are in paris, there have been several false alarms, many fears of terrorism perpetuating there. Do you think if or when the 26yearold hayat boumedien is captured parisians will return to a sense of calm or is this the new norm in paris as it was in new york for quite some time post9 11 . Yeah i think the latter, alex. I was in new york in fact on 9 11 and immediately afterwards. And youre right, it feels exactly like that. Of course, the scale of the atrocity was much greater in new york. But that sense that you just dont know whats coming next that what has happened was so out of proportion to anything that had happened before and such a surprise and the double hit the idea that theres an attack and then theres an attack by somebody else and it has the kind of gruesome climactic ending liked the it had yesterday. I walked under the tunnel of the arch di triumph and there was nobody there. This is a huge time for all the stores in paris. A lot of them almost empty the last couple of days. Things are picking up. People are back out on the streets but theyre looking over their shoulders. People are very nervous because nobodys really sure its over. And its not just because hayat boumedien is still at large. Were seeing reports she may have left the country some time ago. Its because nobody knows if there are other cells like this. If you can miss a cell as obvious as this then what about real sleeper cells . Nobody knows. Which is why next hour i want you to talk to us about the 19th district there, a place with substandard housing and an area where a lot of fomenting of unhappy citizens. Lets get a description of that next hour, okay . All right. Sure thing, alex. Thank you. Journalists fearing for their safety not just in paris but around the world. Ahead, the u. S. Senator whos been working tirelessly to highlight the need to protect correspondents abroad, thats next. 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Joining me now, pennsylvania senator bob casey whos led the annual Senate Resolution to make the protection of foreign journalists a priority. Senator casey, good to see you. Thanks, alex. Good to be with you. You have continually highlighted the need to protect journalists abroad as well as this week the streak of terror in france begins at a controversial news agency, the Charlie Hebdo magazine. Did it surprise you, sir, to hear of journalists being attacked even on western soil . Well its always shocking because we take probably take for granted in the United States that freedom of expression is not only recognized but protected in law. The same is true of freedom of the press. So its always disturbing when it happens in connection with violence. Its one thing to have vigorous debate and even a real aggressive battle or debate about freedom of expression or whats in the news. But when theres violence directed at either journalists or those who have an effort made to express their point of view whether its through cartoons or otherwise, even when thats upsetting we dont in the United States see the same kind of violence. Are you concerned at all that this could mark some sort of a new frontier in terrorism, an effort to control the news messaging . The fact is were putting an aggressive amount of coverage on this because it does strike home to us that are journalists. Theres no question alex, that some will be intimidated by this. We have to make sure that we do Everything Possible to dampen the effort to intimidate those who are expressing themselves in any way but especially when it comes to basic reporting. Im not sure theres been a time in our history in terms of the world where you have a concerted effort in a lot of places in the world, whether its in the middle east or even in europe now, where journalists are targeted, those who are expressing opinions are targeted. So it has to be a response by the international community. First of all, to recognize the value and affirm that. And then to take steps to protect those who are members of the press or those expressing themselves through cartoons or otherwise. As i know youre aware, the president said our country stands with france against hatred and suffering. But do you see any specific support that the u. S. Can offer right now, be it Security Training or perhaps counterterrorism assistance . Well its hard to make an assessment right now, alex. Its difficult to be certain about that. But were going to have to listen to the Security Professionals and see what lessons can be learned. But, of course this relationship between our two countries, france and the United States, goes back to the founding of our country. So its very strong. I think the intelligence gathering and sharing is strong. There may have been some gaps here. We have to assess that kind of in an afteraction kind of way to assess whether or not there are better ways we can share intel. But i think the relationship is strong. And maybe some of the as you pointed out earlier, maybe some of the lessons in Law Enforcement in new york after 9 11 could be instructive. The u. S. State department has issued a travel warning saying americans could face an increased risk now. How concerned are lawmakers that the attackers in france were part of either an ongoing or waker sleeper cell that could target americans next . Theres no question that were seeing in a lot of places if its in the anot a lone wolf in this case, seems like it was a lot more sophisticated and coordinated with training apparently in yemen over a number of years or at least for a period of time. So this has elements to it that are similar to recent attacks. Every time we think we have the image of terrorism fixed in our mind, it will change. So we have to continue to be adaptive to that. Law enforcement and security and intel. So i think its early to make kind of categorical judgments about what we can learn from this. But we have to make sure that any lesson that our Security Professionals impart to us that the Congress Takes action either by way of policy change or appropriations. But speaking of that, i want to ask you this. In an effort to block the president s recent executive action on immigration, House Republicans have fought to only fund the