Picture, ongoing raid in belgium, a helicopter flying overhead. Police already uncovered a bomb with nails for shrapnel, chemicals and isis plag. Im Anderson Cooper, in for jake tapper. We start the lead with breaking news. Video inside the Brussels Airport. Belgian prosecutor say these are the men who unleashed terror. The twoen 0 the left, according to the prosecutor, probably suicide bombers. Now European Police asking for help identifying the man on the right in a hat and light colored jacket. They think he survived the attack. Cnn is working its sources on both side of the atlantic right now. Fred pleitgen and Atika Shubert in brussels. Fred, youre in a suburb of brussels. Raids in just the past hour. s going on . Theres been a big raid going on here, anderson. When we got however over an hour ago there was Police Activity near the cordon behind me. There was a Police Chopper that showed up and it hovered above the area for i would say at least half an hour and there was definitely someone with a rifle who was in the open door of that helicopter, repeatedly pointing at some sort of area. Also had a search light on. Weve also seen a lot of Police Vehicles going into the cordon, a lot going out. The military has been around as well. The latest we have from the authorities, that is apparently they have recovered some chemicals, some explosives, some nails, as well as isis flag. So, clearly the raid here has netted something. Its unclear whether anybody has been taken into custody. But also, the entire area inside the cordon has been emptied of people. Theyve taken all civilians inside into buses, all out, waiting here for hours, as they conduct these Search Operations inside. There are a lot of cops around, a lot of activity with Police Vehicles going in and out of the area right now. Fred plik tin, thanks very much. Atika shoe bart at Brussels Airport the scene of the start of the terror attacks this morning. All of this comes four days after the capture of one of the worlds most wanted men outside the same city, Salah Abdeslam. Hes the sole surviving attacker behind novembers paris attacks. Are Belgian Security officials operating under the assumption the events are connected to his apprehensio apprehension . Reporter well, that is one of the possibilities they are looking at. Trying to see whether or not any of the suspects you see in that photo from the Surveillance Video may be connected to abdeslam. What analysts and experts have been saying this is not an attack that could have happened overnight, however. This is something, especially with the explosives used, must have taken a lot of planning. So this is gone at least several weeks, possibly months of planning in the work. To build the kinds of bombs used in both the airport attack and the metro station attack what happen we know happened at the airport was that there were two explosive devices at least, possibly a third, two of them detonated, however, and they the prosecutors and Police Believe they were detonated by suicide bombers. In that photo, you see two men dressed in blacking each wearing one glove. Police are looking at now whether or not that glove actually hid a detonation device. So this is the line of investigation that police are looking at, trying to identify the men in those photos but also specifically what kind of explosives, what kind of detonation device was used than will tell them who was the man who actually made these bombs. Also, what sort of explosive, whether it does have any connection to the suicide vests that were used in the paris attacks. I want to bring in pamela brown in. Reporter ing me in washington. She has the latest. I can tell you, speaking of bombs, right now the residue from the bomb is be being tested in the laboratory. Authorities are trying to identify the man in the white jacket. The belief is there are more people connected to that mans network. The concern right now to prevent followon attacks. Reporter this airport surveillance picture shows three men suspected in a terror attack in brussels today. Belgian Officials Say the two men in black carried out the Suicide Attack at the airport, and they believe the black gloves theyre wearing on their left hands may have been to conceal detonators. A massive manhunt is under way for the man in the white jacket on the right. The first explosion ripped through the crowded Brussels Airport at 8 00 a. M. Sending people running for their lives. The halls of the terminal filled with spoke. Terrified passengers dropped to the floor and huddled together. I heard an explosion, that was the first one. Reporter minutes later, a second blast inside the airport. I hear an explosion. The ceiling is coming down. I go under the sink. And the second explosion went. Everything is black. Reporter an hour later, just a few miles away at the Maalbeek Metro station in brussels a third explosion, tunnel filled with smoke as passengers trying to fine their way through the dark to safety. I cant explain. It looked like war. Its unbelievable. Its really hard. Reporter brussels is put on lockdown. We feared a terrorist attack would happen and this is what happened. At the airport and at a metro station in brussels, terrorists have committed murder. Reporter the metro station is just one mile from where police raided an apartment and captured Salah Abdeslam last week. One of the suspected ring leaders in the paris attacks. Investigators believe the same terror net work is responsible for todays attacks. As victims in brussels, some wrapped in blankets, are transported to safety, police fan out across the city searching for anyone who was involved. So scared. I feel like its the end of the world. The investigators believe attacks were already in the works before abdeslam was arrested and they were accelerated after his arrest. Investigators said, over the weekend, abdeslam was cooperating but the question remains, how much he knew about these attacks this morning. The fact that the investigators said he was cooperating, did that then encourage any of these attackers to accelerate their plan. Right. And the squeeze has been on, we saw raids happen over the weekend. One official said, the more you put the squeeze on, the more theres going to be a reaction. Pamela brown. Joining me, adam schiff of california. Thank you for being with us. You bet. You just got the latest briefing. What can you tell us . First, about the people in the photographs, do you know anything more about them . All i know at this point is theres reason to believe they may have come from that location where the search was conducted and there may be witnesses that are knowledgeable about their transportation to the airport. So they i think are connected to the location. But still a lot we dont know. We dont know, for example, whether communication at some point with abdeslam. Whether part of the same facilitation ring connected to paris. A lot of mow does on pperandi ls the same, nature of the targets, potentially explosives. Again, still waiting for the specifics. So, the neighborhood thats being searched right now, its believed, at least one or more of the people in that photograph, the airport, came from that neighborhood . In certainly believe to think that the attackers may have come from that location. I dont know that they know for sure that its connected to the people in the photograph although that photograph, given you have two people with one glove certainly looks like theres reason to believe they may have been imcomplicated. Is it clear to you whether that person who is believed to have gotten away, the person in that photograph, is a coordinator in a elizabethkingia meningospeticaer sense . We knee no the attacks abu on the ground coordinator took part we know in some of the attacks. Do we know if grouping at airport is directly connected to the group at the subway station. I think we all assume thats the case. This is one cell operating that attack mult. Targets at the same time. But there could be others that are out there now which is why brussels is on heightened state of alert. A lot of people have come back from the fight, as im sure you pointed out. Belgium produce more per capita to the fight. A lot of people at large and the extent of the facilitation ring we dont know. People in paris, berlin, elsewhere cant afford to rest a an attack leike this requires a fair am of planning. It couldnt have been ginned up in the last day. The arrest of Salah Abdeslam, it may have caused other plotters to say we need to move now. It may be the attacks could have been far worse had that arrest may not been made, it may have accelerated the timetable. In terms of cooperation, so much concern in wake of the charlcharlie hebdo attacks ab cooperation within europe. Has that gotten better . Data sharing, information sharing . Only marginally better. Europe has this predicament, they are have to decide to let people move freely. They have tried to break down some stove pipe but sometimes it requires legislative or parliamentary action. Theres a lot of suspicion in the european union, criticism. You can see french authorities criticizing the belgians. In terms of logistic, it seems like belgian authorities are overwhelm by the sheer volume and capabilities. Belgium ramped up capabilities and personnel but it takes time to train those people. When they ramp up to the degree they have planned, theres still going to be inadequate to the task because you have so many foreign fighters come back. Given the refugee and migrant flows, keeping tr ining track o come back into the country is enormously difficult. If you dont have enough information to arrest those that have returned, if you cant prove they have Material Support to terrorism you have to watch or try 4 7 which is manpower intensive. Congressman adam schiff. More breaking news, Law Enforcement around the world on high alert, whats being done in the United States to protect soft targets all of that and more ahead. Youre an at t Small Business expert . Sure am. My staff could use your help staying in touch with customers. At t can help you stay connected. Am i seeing double . 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Start your trugreen lawn plan today. Bye now. Trugreen. Live life outside. Hes noticing a real difference in his joint comfort. As well as heightened levels of abject humiliation in his son. In just 7 days, your joint comfort can be your kids discomfort. Osteo biflex. Made to move. This is cnn breaking news. Welcome back to the lead. Im Anderson Cooper in for jake tapper. Breaking news. Two senior u. S. Officials tell cnn they believe the deadly terror attacks in belgium are tied to the paris cell that massacred 130 last year, the same network with Salah Abdeslam was a part of. Abdeslam was arrested this past friday after months of being on the run. The terror attack in brussels is also raising the alarm here at home, local state and federal Law Enforcement officials stepping up security measures of transportation hubs and landmark sites. Right to cnns rene marsh live at Reagan National airport in washington. The attack happened in the departure area before anybody went through security. Its traditionally the most vulnerable part of an airport. Authorities worried about this attack for a long time. Reporter after the brussels attack it is a deadly reminder to show how difficult it is to protect soft targets areas outside security checkpoints, airport entrances like where i am, train stations. Although the federal government is saying there is no credible thre thre Security Response weve seen the attack overseas stoked increased concerns for the u. S. Transit system. Reporter this scene in europe has led to this scene in the United States. New york is adding police and National Guard with heavy weapons to locations around the city. High visibility, antiterrorist patrols can be seen in the subway system where officers are checking bags for explosives and the citys three major airports has seen stepped up security. Expect to see extraordinary nypd presence out over the coming days as a sign of our readiness to protect people at all times. Reporter airports and cities across the country, including atlanta, boston, chicago, miami, and los angeles, have also ramped up the security presence, police chief Patrick Gannon overseas l. A. X. , one of the worlds busiest airport. We never want to be predictable. We also feel if youre predictable, youre vulnerable. Reporter soft targets like train stations and u. S. Airports have been a security concern. Areas like passenger drop off, Airline Ticket counters, baggage game, and all other areas before the security checkpoint are potentially susceptible. We employ our own intel analysts that provide us with airport specific and Transportation System specific information that helps us in our daily deployment of our officers. Canines are trained, i think best in the country. Reporter in the nations capital, bomb sniffing dogs and s. W. A. T. Can be seen on patrol. Amtrak police are conducting random bag collects and ongoing show of force around the country. We just got word that tsa will deploy viper teams to major airports across the country. These are specialized teams using everything from canines to advanced Screening Technology to further enhanced security already in place. All taking this seriously. Understandable. Right to our panel or terrorism experts and talk about what theyre learning about the attacks. Senior editor at daily beast, Michael Weiss who cowrote isis inside the army of terror, and cnn National Commentator mike rogers. Chairman rogers, start with you. If its true that what were hearing from some u. S. Officials that this is linked to the cell involved in the paris terror attacks,s that an extraordinary development, the fact after months of a massive manhunt in belgium, even in france, that a cell was able to be operational and carry out another deadly attack . Absolutely. They werent able to penetrate the electronics of the cells communication, thats a very important factor. The very fact that the nine districts in belgium, neen din Police Districts dont cooperate well, they dont have good information sharing, dont even have the same language in some cases, made it very, very easy for a group of individuals who wanted to protect the people around them to do just that. So, these cells, and my fear is theyre looking for one person. You have two suicide bombers that have a logistics trail to them. Everybody from the development of the materials needed to the training needed to the radicalization process meaning youve got to go through a process if youre going to be a suicide bomber and in their mind get to heaven, all of that means there are a lot more than three people youre talk here. All of that, you see the heavy reaction in belgium. Michael weiss, to the chairmans point, we know in the paris attacks there was a greater level of central coordination than we had thought in the initial days and weeks after the paris attacks. It wasnt just na guy who was controlling things there were calls made by the attackers and Text Messages sent to phone numbers in belgium, in brussels, so the likely hood that this involves more than just three people in that photograph and whoever was involved directly in the subway attack is gray. Absolutely. Ive talked to a counterterrorism official in france who told me the Network Originally thought to be 15, 20, meaning the perpetrators of the paris attack, now looking at something more along the lines of 30, perhaps greater, 40. There United States and a guy, in the safe house that was raided when Salah Abdeslam was captured. Bellcade was killed himself but he was seen to be the seniormost isis official with respect to the network. Doesnt due to call them the belgium or french networks. Its a frank aphone network and you have a mix of different nationalities. He was algerian by dissent, 35, 36, lived in sweden and transgressed through multiple countries in europe, including france, germany, perhaps austria, and we know this, by the way, his name was listed in that isis documents that sky news published a week ago showing foreign fighters and the meticulous bureaucratic. They want to know what the background is, country of origin, married, they have phone numbers in the documents for family members of the foreign fighters. And there were phone numbers miss listed for the next of kin. Hes dead. But theres no question this was interlinked and coordinated and absolutely u. S. Intelligence are thinking this is