Large bombs when you look at the damage, and assess the casualties. Basically terrorism as we see it here explosives we saw in paris, explosives with active shooters. Is a lowtech lowcost extraordinarily high impact venture. Since paris over the last four months islamic extremists in brussels have been under withering scrutiny. Intelligence officers have been raiding their homes, tapping their phones how can this a happen with that much scrutiny . Couple of ways. One there is an opposite argument that intelligence was pretty good. Managed to find their way just a few days again to a secret safe house. Hit that location. Actually come up with a mastermind who was not just a mastermind, planned attacks in western europe and brussels but attacks that happened in paris. Thats very good intelligence. On the other hand. A shootout. Officer wounded. Couple individuals got away. So you look at that. But i think the real point here scott, is that we are looking at going dark. Which is whether it is the telegram which you featured on 60 minutes this week which was all encrypted. Or the app, which comes out of san francisco, not russia. That is all encrypted. We are seeing not just iphones that cant be cracked, but entire Communication Systems that are designed to be impenetrable, we are seeing those become the primary tools of terrorists. Stow when you ask a question like how could they miss this . Technology is becoming a big enabler. Jon Miller Deputy commissioner of the nypd. Jon, thank you. Great to have you with us. Four months since the isis assault on paris that killed 130. Many of those terrorists came same brussels neighborhood that allen pizzey showed us. Holly williams its in harris tonight. What are the connections between paris and brussels . Reporter scott, there are suspicions. At this point no confirmation the two are closely linked. Just four days ago, Salah Abdeslam, the alleged logistical planner behind the paris attacks, was finally captured in belgium. And when the Belgian Police raided an apartment last week in brussels they found ammunition and isis flag and abdeslams finger prints. That raised suspicions that another attack could be imminent. But all of europe has been on alert since the paris attacks. Ow could this happen today . How could this happen today . Scott, we dont know if there were any intelligence failures. One criticism, leveled at european intelligence officials. They dont share enough information because they dont trust each other. That is a very big problem. Because within europe you have open borders. And visafree travel between countries. Some of the men involved in the paris attacks were able to go to syria, fight, or receive training from isis and then return home, traveling through europe apparently unnoticed. The big question now especially after todays attacks, is how many more young men may have done the same thing. Holly williams in paris for us tonight. Thank you. How did isis succeed today with police hot on their trail . Well have that next. The cbs overnight news will be sounds of birds whistling music introducing new ky touch gel creme. For massage and intimacy. Every touch, gently intensified. A little touch is all it takes. Ky touch. You can finally break up with bleach. Lysol with hydrogen peroxide. For a tough clean with zero percent bleach. Lysol that. cell phone rings where are you . Well the squirrels are back in the attic. Mom . Your dad wont call an exterminator. Can i call you back, mom . He says its personal this time. If youre a mom, you call at the worst time. Its what you do. If you want to save fifteen percent or more on Car Insurance you switch to geico. Its what you do. Where are you . Its very loud there. Are you taking a zumba class . Janet . Cough if you can hear me. Dont even think about it. I took mucinex dm for my phlegmy cough. Yeah. But what about mike . It works on his cough too. Cough it works on his cough too. Mucinex dm relieves wet and dry coughs for 12 hours. Lets end this. Ugh. Does your carpet ever feel rough and dirty . Dont avoid it. Resolve it. Our new formula not only cleans and freshens but also softens your carpet so its always inviting. Resolve. A carpet that welcomes you. Michael morrell was for three years number two at the cia. Now our cbs news Senior Security contributor. Michael, in the four months since paris, the authorities have been watching these neighborhood in brussels they have been raiding homes, tapping phones. How did isis pull this off today . Scott, i think it is a combination of two things. One, a combination of how sophisticated these guys are. The investigative report on paris showed use of throwaway phones sophisticated document forgery, the making of bombs in europe by bombmaking experts, the ability to move money around use of encrypted apps that, that Intelligence Services cant read, theyre sophisticate sophisticated, right. One reason. The other is the very large numbers of individuals we are dealing with here. 5,000 people went from western europe to iraq and syria to fight. Some are there. Some died. Some of them are coming home. The number is huge. Put the two things together it is a very very challenging problem. Are you saying these guys are experts at what theyre doing . Theyre very good from my perspective. Trained in iraq and syria by pros. Where are we now in the fight against isis . So i think you have to look scott, at what they want to do which is conduct attacks against us. What we want to do is which is stop them by degrading that capability. In the last 4 1 2 months scott they had four victories. They brought down an airliner in sinai, an affiliate, conduct add takes in paris, direct add take San Bernardino an inspired attack brussels inspired or directed. A pace of operations that al qaeda hours of the attacks in brussels the fbi stepped up surveillance of potential terrorism suspects in the United States. Diego rodriguez assistant director of the fbi. We are going to ramp up on awful our seb all of our subjects. Officials are concerned about potential for isis sympathizers to plot attacks in the u. S. There was a similar fear after the paris attacks in november. A former white house counterterrorism official. The concern is could there be copycats in the u. S. You always need to be worried about copycats. Because there is an old saying terrorists are not innovators theyre immay toreitators. Reporter more than one third of isis linked terror plots have been aimed at the United States or interests overseas. U. S. Officials also estimate 30,000 foreign fighters have traveled to syria and iraq to join isis. Including around 150 from the u. S. One intelligence Consulting Group believes about 40 have returned. Those are the ones u. S. Law enforcement officials are aware of. Where are you from . The United States. Reporter just last week american Mohammad Jamal khweis surrendered to Kurdish Forces in northern iraq. He traveled from the washington, d. C. Region to syria to join isis. And he was not known to the fbi. What you are seeing right now is, we are shaking every known bush. You are going to have a number that wont necessarily be on anyones radar screen. Thats something we need to be cognizant of. Reporter the couple behind decembers San Bernardino attack was not on the fbi radar either. Scott, today, Homeland Security sent a bulletin to Law Enforcement agency as cross the country warning of the potential threats from isis. Jeff pegues in the washington newsroom. Jeff, thank you very much. The cbs overnight news will be right back. President obama left cuba tonight for argentina. He was in havana when he got word of the attacks in brussels. And did not allow change his travel plans. Margaret brennan is with the president. Reporter in a secure call early this morning, president obama was briefed on the bombings. We will do whatever is necessary to support our friend and ally belgium in bringing to justice those responsible. Reporter at his keynote address and cuban leader raul castro looking on the president quickly turned back to his historic trip. I have come here to bury the last remnant of the cold war in the americas. He touted benefits of democracy to a still authoritarian country and pointed to americas president ial campaign as proof that anything is possible. You have two cuban americans in the Republican Party running against the legacy of a black man who is president , arguing theyre the best person to beat the democratic nominee who will either be a woman or a democratic socialist. Who would have believed that back in 1959 . Reporter later the president and first family joined castro at a baseball game between the Tampa Bay Rays and the Cuban National team. We condemn the acts of terrorism in belgium. For this we request a minute of silence. Reporter after a moment of silence for the victims in belgium, the mood lightened. The two leaders did the wave and cheered a play at the plate. President obama told espn that changing his schedule would have let the terrorists win. What they can do is scare, and make people afraid. And disrupt our daily lives. And divide us. And as long as we dont allow that to happen we are going to be okay. Reporter white house officials believe that terrorism is a persistent threat but one that they can manage. And scott, the president feels strongly that it shouldnt dominate the u. S. Agenda. Margaret brennan covering the historic trip to havana. Margaret, thank you. In brussels this 22nd of march there was no separation between day and night. This evening, candles do what the sun could not, cut through the darkness that has fallen over this city. And in light, the world shows its unity against the terrorists. The colors of belgium bathe the eiffel tower in paris, the brandenberg gate in berlin the trevi fountain in rome and in washington this night, light shines on the most powerful symbol of freedom in the world. As america honors the fallen. Thats the cbs overnight news for this wednesday. For some of you the news continues. For others check back with us a little bit later for the morning news and cbs this morning. From the Broadcast Center in new york city, im scott pelley. Welcome to the overnight news. Europe on high alert and dragnet under way after the terror attacks in belgium. Bombs went off at an airport in the capital also at a busy train station. At least 31 people were killed. About 200 others hurt. The Islamic State is claiming responsibility and threatening more attacks. Our cbs News Coverage begins with Charlie Dagata at the brussels airport. Through the dust and chaos there was no mistaking what happened. A massive blast, blew windows out and Ceiling Tiles and passengers fled. A young woman, cried for her mother. And a man shouted. Soldiers. There were no soldiers to come to their rescue. Streamed outside looking for help. Some of the injured were wheeled out on luggage carts. All the luggage stays here all the luggage tays here reporter the area outside the airport, a tangle of injured bodies. Those who came to help were quickly overwhelmed. After the first explosion in the departure area, a second one followed. It was very loud, yes. It was not something that fell on the ground or Something Like that. It was you felt kind of a shock. For everyone it was a terrible thing. The explosions were right in front of me this woman said. Look around. Reporter isis claimed responsibility quickly for the attacks today warning of more dark days ahead. Belgian Police Released this photograph of three suspects. Look at the two on the left, casually pushing luggage which officials believe were loaded with explosives. Theyre wearing only one glove each, possibly to conceal a detonator. Both men were killed in the attacks. The third man, in the hat, has vanished. According to police, he left his luggage and is on the run. Another bomb was found which police detonated by a controlled explosion. This afternoon, Security Forces conducted raid in the brussels neighborhood of shaerbeek and found two more explosive devices containing nails as well as chemicals. And an isis flag. One of the doctors who dealt with the worst of the injuries said he hadnt seen any bullet wounds. Only injuries caused by the blasts. The attacks in belgium come four days after Salah Abdeslam was caught in a Dramatic Police shootout in brussels. One of the ten paris attackers, abdeslam was the only one to survive the Police Dragnet and evade capture for four months. After his arrest, abdeslam had promised new attacks, heightening fears among Security Forces, that the militants reach into europe is deeper and larger than they knew. Now, Counterterror Police are conducting further raid tonight, scott. They launched a massive manhunt to find the missing third suspect. After raid in brussels uncovered two more bombs today, police fear militants may have been planning even further attacks. Moments after, passengers fled to safety. Smoke billowed from the entrance as days commuters streamed out. The explosion went off barely an hour after the airport attack. The mangled remains of the cars were graphic evidence of why there were so many horrific casualties. Sometreated in the street. Many had what appeared to be serious head injuries. Emmanuel batiot arrived in the aftermath. You see it, you cannot imagine when you see people yelling. Like, they were like they are going to die or and you dont know, you feel like you are raging. Lachlan carmichael was on another train in the tunnel. We received a blast of air. And the train stopped. And we had the we had the normal recording announcements. We have just had an incident on the line. Passengers told me inside they felt very nervous and very worried. Reporter police and soldiers flooded the area. The station is only 400 yard from the European Parliament building. The area is considered among the most secure in the belgian capital. This is a city that lives with a major terrorist in its midth. It eminates from here, the suburb of molembeek. Many of the terrorists plotted the paris attacks in the neighborhood. In the wake of the bombing the authorities asked people to move around the city as little as possible. That has now been lifted but the Belgian Crisis Center warned that the threat of more attacks is real and serious. Stephanie is now missing. My husband called, the american embassy, and theyre looking for her too. Did you receive some information . I havent gotten any information. Reporter the injured include two missionaries from utah 66yearold, richard norby, joseph empy, 20. Mason wells, 19. All three are recovering from their injuries. Friend tell us wells was also at the Boston Marathon bombing and last years paris attack. A u. S. Air force lieutenant colonel, wife and four kids were also injured. Were told some were seriously hurt. This man, seb bellin is a belgian businessman who once played College Basketball for Oakland University in michigan. His father spoke to his son in the hospital. Well, he saw people dying. He saw people dead. And people dying. So, thats im sure that will stay with him for the rest of his life. The near misses. The three students from Quinnipiac University in connecticut are studying abroad. They were at the airport traveling for spring break. Kate duffy spoke to us by phone. A huge ball of fire and it was like 50 feet from us. It was absolutely insane. Professional basketball fans will be relieved to hear while former nba all star Dikembe Mutuombo was in the airport at the time of the bombing he is reporting on his Facebook Page he was unharmed. Jim axelrod, thank you. Four days ago, Salah Abdeslam the alleged logistical planner behind the paris attacks was finally captured in belgium. When the Belgium Police raided an apartment last week in brussels, they found ammunition an isis flag and abdeslams fingerprints. That raised suspicions that another attack could be imminent. We dont know if there were any intelligence failures. Certainly one criticism that is leveled at european intelligence officials is that they dont share enough information because they dont trust each other. 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