Overnight. Theyve arrested a suspect who is said to be in quote the advanced stage of planning a terrorist attack. Police say they recovered explosives and a rifle. Lets bring in Nick Paton Walsh and Clarissa Ward in belgium. Nick, lets start with you. Bring us up to speed. Reporter we do know at this point, pam, little about the suspect apart from the mayor talking to state media saying hes related to the brussels attacks on the airport and the metro here. Hes in custody and was injured. Let me explain the drama. A matter of hours ago, amateur video and witnesses confirm that the man in question was sat just on the other side of this board here in the tram stop on the bench. He was approached by police. Two shots were fired. One, we understand, hit him in the leg. We dont know which one. He was wearing a backpack. It appears police were concerned about whether he was carrying a device on him. He must have been dragged away from that tram stop, just away from where im standing. There is blood, in fact, slightly further down the street. The police move one of their cars across there and took shelter on the other side of it. That dramatic scene playing out here just in matter of hours ago. Suns consequently, one of the bags here was checked by police. After those shots were fired, i should point out, there was a third noise. Witnesses say it sounded like an explosion. We dont know if that was part of the police operation. E we dont know if it was initiated by the man they then arrested or somehow unconnected. People here deeply on edge. There was a tram that was passing through here. It was stopped just down the street. The number 25, and people taken off it. Moved away. Those trams allowed to leave the area suns consequebsequently. We saw Police Officers here. I must say, the general public came back quickly. The broken glass from the tram stop still on the floor behind me. As you can see, the trams continuing about their business as normal. Part of the challenge for authorities is to collect the evidence they must and then let daily life continue. This, just one of a number of raids happening. The man injured, taken into custody. He must have been a substantial target because of the nature in which police approached him. We have seen video of them obviously deeply concerned, this man wearing a backpack. Either a young woman or girl near him during the confrontation. It is not clear his relationship with her or quite what happened during that confrontation. Deep concerns, always, pam, about how much police know. But we know there are three individuals theyre chasing. Do they have the full picture . Or are they still picking people up one by one . Finding out more information as they go. Pam . Absolute flip multiple isis plots are in the works in europe. We have learned from u. S. Officials. Clarissa, what can you tell us about the raids carried out overnight . Reporter there were a series of raids. Six people were defand three of them are believed to have now been released. One of the raids taking place in the area where Nick Paton Walsh is in the schaerbeek district. We were there on the scene. We could see Forensic Experts combing through top floor of a building. Looking for evidence. Taking swabs, taking samples. Obviously floork traces of explosives. Traces of dna. Any identifying factors that can help them on this manhunt. Theyre look for these two men. We heard about an rest in germany. Were seeing this plot overlapping now into france and also into germany. We heard the man in germany arrested who sounds like he might be most closely related to this plot was stopped on a routine check. He was act us ing suspiciously. They found a text message was sent at 9 08, just three minutes before the metro bombing. In gnthat text was the name ka lead el bakraoui. One of the suspects. Were seeing that the network goes beyond belgium. Beyond france even to germany as well. So, authorities here very much focused on trying to contain the situation and find, primarily, pam, the two men we know were involved in the airport and metro bombings. But also trying to drill down on the notes of the network as it spreads out across the continent. A race against time to do that. Nick and clarissa, thank you very much. Were systematically eliminating the isis cabinet. That was when the secretary announced the elimination of al qaduli. Isis null two. We have taken out the leader who is in charge of funding. Our correspondent Barbara Starr joins us now. You have new information about the u. S. Operation that killed him. Were now just learning from our sources here at cnn that when u. S. Special Operations Forces moved in, this happened in syria, their goal that time was to try to take qaduli alive. They were going try to capture him and interrogate him for whatever intelligence he had. He would have had plenty being the socalled finance minister of isis. Were told something went wrong during that effort. When u. S. Helicopters moved in, special operation commandos on board. Qaduli was in a vehicle below. Something happened. It made them unable to take him alive. Some kind of fire fight by all accounts breaking out. When it was all over, qaduli was dead. Some of the most dangerous work for u. S. Special op rags forces. I mean, just think about it. Theyre going behind enny lines. Enemy lines. There are no Friendly Forces on the ground in syria that would be welcoming to u. S. Forces. This was a very highrisk mission. Something done by the most highly trained forces in the u. S. Military. Nobody on the u. S. Side killed or injured. The finance minister, qaduli from isis, gone. Secretary Ash Carter Says it goes a long way into putting a crimp in their finances. Barbara starr, at the pentagon, thank you very much. And the killing of isis finance minister is a significant break through in the war against isis in syria. I want to talk about it with colonel steve warren. Thank you for being on with us. Its a pleasure to be here. Thank you. First, colonel, i want to get your general reaction to this news about the killing of the man who many consider as the number two in the isis chain of command. How significant is this . Well, abu imam, what we call him, was their finance minister. He was also an external operations planner. In fact, we know that he was actively planning external attacks presumably in the west or even in the United States. This is a significant strike that we took to kill this enemy. And it follows right on the heels of us killing omar the chechen. Abu sashani. Their top military leader. Were chipping away at their leadership. And we think thats important. I want to talk about the way he was killed. Or Barbara Starr said initially, the u. S. Wanted to capture him alive. The circumstances changed. They couldnt do that. The way in which he was killed. This kind of operation, tell us about that and how risky it was. Well, we would always prefer to capture, if possible. We captured abu daoud, who is isis chemical weapons chief. We were able to get a significant amount of information from him because we captured him alive. Our special operators work in the shadows. We dont like to talk in much detail about how they do their business. We prefer this enemy to have to sleep with one eye open. These are terrific commandos that can do extraordinary things around the world. Were seeing that now. You cant just take out terrorism in one fell swoop. Clearly, hes considered a key player. What about the isis leader, because he remains on the loose . Abu bakr al baghdadi. Does this mean we could be closer the getting al baghdadi . Were continuously working to try to get closer to him. Hes a slippery character. Hes been around for awhile. So hes smart. But were smart, too. We have lots of resource and capabilities. Were dedicating energy to finding him. Hes being hunted. He knows it. Eventually, as have all the International Terrorists, eventually, well find him. Our long arms will reach out and get him. Thats the most important thing to remember. In the wake of the tragedy in brussels, the paris attacks, the other attacks, its important not to forget a lot of good men and women are out here putting themselves in harms way and fighting this enemy. I want to ask you. Because a year ago, all we talked about is how sere ayria intelligence black hole. How does this ability to capture people recently show the change . Intelligence builds on itself. As you gather it up, it grows larger and larger and larger. Now, after a year, year and half of really dedicated work, were beginning to put the pieces of this puzzle together. You can see the results. Youre seen them when we killed their defense ministry. We captured their chemical weapons minister. Captured the wife of and killed their oil minister several months ago. So its beginning to get better. We believe this enemy, isis, is on its heels. Theyre on the defensive. So if isis is defeated in iraq and syria as is the goal, many equated this to cockroaches pouring out of an object. How do you contain this threat . Well, theres theres a second piece of this. A Homeland Defense component to this counterterror mission. This is very important. Were seeing it play out now in europe. And of course, we know that our great First Responders and our homeland defenders back in the United States are always on the job. Thats really the second piece of the puzzle. Bringing together the Homeland Defense and the Law Enforcement component to really squish this enemy, this terrorism threat completely out. And so thats what were counting on them to do. Well fight them here. We know our First Responders will fight them back home. Colonel, thank you so much. We really appreciate it. Pam, its a pleasure. Thank you. Looks like were losing you there. Up next, are all the raids and arrests increasing the threat of another attack . And secretary of state john kerry sits down with our own erin burnett and calls what happened in brussels an take on america. Well be right back. You both have a perfect driving record. Perfect. No tickets. No accidents. That is until one of you clips a food truck, ruining your perfect record. Yup. Now, you would think your Insurance Company would cut you some slack, right . No. Your insurance rates go through the roof. Your perfect record doesnt get you anything. Anything. Perfect for drivers with accident forgiveness, Liberty Mutual wont raise your rates due to your first accident. And if you do have an accident, our claim centers are available to assist you 24 7. For a free quote, call Liberty Mutual at switch to Liberty Mutual and you could save up to 509 call today at see Car Insurance in a whole new light. Liberty mutual insurance. One of the breaking developments in the brussels terror takes is the stunning but long feared news that americans have been killed. At a News Conference earlier today, u. S. Secretary of state john kerry said quote, the United States is praying and grieving with you for the loved ones of those cruelly taken from us. A u. S. Official traveling with kerry confirmed two americans are among the dead. Kerry also took a moment the lay a wreath to remember all 31 people who died in the brussels takes. Earlier in an interview with erin burnett, kerry talked about the worldwide impact of the terror attacks. Americans, of course, we now know are dead here. Do you consider this an take against america . Whenever americans are killed, of course. So you do consider this an take on america. Do you think americans were targeted . Its an attack on america, europe, civilized people and tons aton countries all around the world. People who werent here and werent killed. Its an take on everybodys ability to move freely, to live without fear. And thats what the terrorists want. And that is precisely why we have to continue as we are to go after daesh with full determination to destroy them. Im confident were going to. You have put out a warning about nearterm attacks. And the concern of that. Here, theyre worried about more cells. More attacks. Do you have knowledge of what those attacks might be . I dont, personally. I think there are strands of intelligence here and there which we wouldnt talk about publicly any way at this point. But the point is, we know that there are foreign fighters who have returned from syria over a span now of about five years. Theyre in various places in the world. Loads of countries. America included, by the way. We have had some 500 americans who have chosen to go to syria and fight with daesh over the last few years. That is the reason for people being individual lanlt and alert. Thats the reason for travel advisories and restraints. I spoke to the brother of the bombmaker yesterday. He said the family told the bell jans when he went to syria in 2013. The belgians didnt follow up with them. I spoke to a young man yesterday who has 10 to 15 friends in syria. I can go tomorrow if i want to. You can call the police. They dont care. Many of the young mens ultimate goal is to attack america. Could this kind of thing happen in the u. S. . Well, it did in san bernardino. We saw somebody come back, radicalize, and go on a killing spree. So, everybody understands that any of the foreign fighters who is co have come back still atoochd daesh. Many people have left daesh, recognizing it was a lie. That all the things they had been told were lies. Some of those people were executed. Others managed to get away. Theyve come back to tell the story of the lie. So, we dont know how many people precisely there are who have filtered their way back in. But, i believe very deeply that as we put additional pressure on daesh in syria, and iraq, it is entirely possible that in some other part of the world, people will lash out out of desperation. Are you concerned about attacks on american airports . American metro stations . Attacks like the ones we have seen here. Which intelligence says are linked to isis Head Quarters . A different profile than san bernardino. Let me put it to you this way. Law enforcement and intelligence community, people have to get it right to prevent an take. Every minute of every day, 24 hours a day, seven days a week, 365 days a year. If somebody wakes up one morning in their apartment and decides to kill themselves and take people with them, they can most likely find a place on a subway, on a bus in a market, somewhere to do it. Unfortunately. So, theres a very you know this is a difficult challenge. And frankly, its quite remarkable that our Law Enforcement community, intelligence, police, have done as good a job as they have done protecting us here in america as well as other parts of the world. That doesnt excuse one single event when it happens. Everybodys focused on it with the intensity that we see here in belgium right now. But im convinced that we are slowly and steadily deteriorating daeshs ability to recruit. Its ability to prosecute. Its neolistic ideology. And over time, we are going to get back to a world where we feel that we can travel with impunity and feel safe. And we also know that two dutch citizens living in new york were also killed. They are brother and sister sascha and alexander pinczowski. And emilyizenmans boyfriend, bart migom, was identified today. At least 30 people are wounded. Many of them still hospitalized. Several are americans. Here, you see the emotional moment the parents of one of those victims, mormon missionary, mason wells, of utah, got to see their son. Hes begun the long road to recovery. It was masons second brush with death after sur vooifg the Boston Marathon bombings in 2013. He talked about his harrowing experience. They really came out of nowhere. Um, they dish wasnt expecting it autoall. I was looking down, a huge blast came from my right. I believe my body was picked off the ground for a moment and um my ipad that was in my hands. I dont know what happened. It just disappeared. Think it might have just hit me in the head when it got blasted out of my hands. My watch on my left hand just disappeared. My left shoe was blown off. A large part of the right side of my body got really hot and then really cold and i was covered in a lot of fluids, a lot of blood. A lot of i a lot of that blood wasnt mine either. It took my body about a second, a half a second, to realize it was a bomb that went off. Um and of course, im sure my body was in complete physical shock. I knew that i had been wounded. I didnt know how bad it was. Um i located an exit. I looked up, i located an exit. I started to run toward the doors we had come in through. I took a couple of steps. About three seconds after the three or four seconds after the first blast the second bomb went off. I felt the explosion on my right side. I could feel the blast. I was so lucky. I was so lucky, being how close i was. I saw a lot of people that were injured worse. I heard a lot of people that were injured badly. And my only thoughts, my only feelings for the people that are out there, i hope that theyre doing okay. Wow. What a brave young man. Amazing to see him talk like that after going through all that hes been through. Coming up, authorities across europe racing to foil isis plots. The latest on a series of raids. Plus, isis finance minister killed in an operation. Was there any connection to the brussels attacks . 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