Captioning sponsored by cbs this is the cbs evening news with scott pelley. Pelley we begin tonight with the breaking news from brussels where the toll continues to rise in the terror attacks at the airport and the subway station. The coordinated bombings killed at least 31 people. 250 were wounded, including some americans. Isis claimed responsibility and warned today that there will be more dark days. Officials believe the two men there on the left were the suicide bombers who attacked the airport and a search is on right now for the third man there on the right. We have extensive coverage tonight. First we go to dagata doing at the airport where 11 died. Reporter even through the dust and the chaos, there is no mistaking what had happened. A massive blast blew windows out, Ceiling Tiles collapsed as a young woman cried for her mother. [cries] and a man shouted. But there were no soldiers to come to their rescue. In the confusion, the survivors streamed outside looking for help. Some of the injured were wheeled out on luggage carts. All the luggage stays here. All the luggage stays here. Reporter the area outside the airport became 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. It was not something that fell on the ground. You felt kind of shocked. For everyone, it was a terrible thing. Were right in front of me, this woman said. Look around. Isis claimed responsibility quickly for the attack today, warning of more dark days ahead. Belgian Police Released this photograph of three suspects. Look at the two on the left, casualty pushing luggage which officials believe were loaded with explosives. Theyre wearing only one governor 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 raids 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 the blast. The attacks in belgium come just 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 raids tonight, scott. Theyve launched massive manhunt suspect. After raids in brussels uncovered two more bombs today, police fear militants may have been planning even further attacks. Pelley Charlie Dagata at the airport for us tonight. Charlie, thank you. So why brussels . Reasons. Union. Its home to the nato alliance, islamist extremists. Today at least 20 of the dead were killed in the subway station that serves the European Parliament, and becca Becca Pizzi Allen pizzey is there. Reporter minutes after an explosion ripped apart a rush hour subway train in central brussels, passengers scrambled to safety in near pitch dark. Smoke billowed from the station entrance as the 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 karmities. Some of them had to be treated in the street. Many had what appeared to be serious head injuries. Emmanuel batiot arrived during the aftermath. You see it in a movie, but you cannot imagine when you see people yelling like they were. Like they are going to die, and you dont know. You feel like you are raging. Reporter Lachlan Carmichael was on another train and we received a big blast of air, and the train stopped. Your attention, please. And we had the normal recording announcement. Weve just had an incident on the line. Passengers told me inside they felt very nervous, very worried. Reporter police and soldiers flooded the area. The station is only about 400 yards from the European Parliament building and the area is considered among the most secure in the belgian capital, but this is a city that lives with major terrorist threat in its midst. It emanates from here, the suburb of molembeek, known to have sent at least 30 foreign fighters to syria. Many of the paris terrorists lived and plotted the november attacks in the neighborhood. In the wake of todays bombings, the authorities asked people the move around the city as little as possible. That has now been lifted, scott, but the Belgian Crisis Center warned the threat of more. Pelley allen pizzey in brussels. Allen, thank you. We know of no americans killed today, but several were wounded. Jim act has the latest. Reporter Carolyn Moore from kentucky was with her daughter stephanie when the bombs exploded at the airport. Stephanie is now missing. My husband called the american embassy, and he said theyre looking for her, too. Did you receive information from. I havent gotten any information from anyone. Reporter the injured include three mormon missionaries from utah, 66yearold richard norby, joseph empy and mason wells. All three are recovering from their injuries. Friends tells us wells was also at the Boston Marathon bombing lancier ear paris attack. A u. S. Air force lieutenant colonel, his wife and four kids were also injured. Were told some were seriously hurt. This man, seb bellin is a played College Basketball for Oakland University in michigan. His father spoke to his son in the hospitals. 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. Reporter and then there are the near misses. These 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. There was a huge ball of fire like 50 feet from us, and it absolutely was insane. Reporter professional basketball fans will be relieved to hear that while former nba allstar Dikembe Mutuombo was in the airport at the time of the bombing, he is reporting on his Facebook Page he was not injured. Pelley jim axelrod, thank you. Well, here at home Law Enforcement went on high alert, and Michelle Miller has that. Reporter just before rush hour this morning, new york city deployed an army of three elite units, including its hercules team, specially trained to protect the citys most sensitive target and transportation hub. New York City Police commissioner bill bratton. The timing of this event allowed us to hold over the morning tours of duty on all of those units, so we have literally double the amount of officers available to us this morning. Reporter thousands of commuters filed past heavily armed officers and were thought to have their bags searched. Its comforting. Very grateful to all of them. Reporter in los angeles, Police Presence was beefed up at union station, the largest rail terminal on the west coast. Los Angeles Police chief charlie beck. We want to have high visibility. We want to make sure that our Critical Infrastructure is safe. Reporter in chicago, police had k9 units on the platform when train arrived, and in washington, d. C. , the metro police chief consulted with f. B. I. This morning to make sure could to protect passengers. Mary battle and her family visiting from florida witnessed square. Im hoping that with the extra security here that this is going to be one of the safest days. Reporter scott, while there is an arm presence in times square above ground, the nypd announced that it will be. Aing up patrols whose sole purpose will be to guard the citys busy underground sunway system. Pelley michelle, thanks very much. The man who runs counterterrorism and intelligence for new York City Police is Deputy Commissioner john miller and a former Senior Correspondent here at cbs news. John, is isis coming here . Reporter well, isis is already here. As isis has developed as an organization, scott, what weve seen is inspired attacks. Theyre basically advertising through social media, theyve called on people the attack here. Weve seen arrests in those cases. Chosen to targets and spoken to people directly over closed social Media Channels where theyve said, heres the target, go do it. What we havent seen is directed attacks. Thats what we saw in paris. Thats what we just saw in brussels. And thats what we have to be prepared for obviously. Pelley what did you learn from the tactics that were used today . I think we learned once again that you have rudimentary tactics. Were talking about fairly large bombs when you look at the damage and assess the casualties, but basically terrorism as we see it here, explosives, or as we saw in paris, explosives with active shooters is a lowtech, lowcost, but extraordinarily highimpact venture. Pelley since paris over these last four months, islamic extremists in brussels have been under withering scrutiny. Intelligence officers have been raiding their homes, tapping how can this happen with that much scrutiny . Well, a couple ways. One, theres an opposite argument that the intelligence was pretty good, they managed to find their way just a few days ago a secret safe house, hit that location, actually come up with a mastermind who was not just a mastermind of planned attacks in western europe and brussels, but attacks that have already happened in paris some thats very good intelligence. On the other hand, there was a shootout. There was an officer wounded, a couple individuals got away. So you look at that. But i think the real point here, scott, is were looking at what we call going dark, which is whether its the app telegram, which you featured on 60 minutes this week, which was all encrypted, or the app wicker, which comes out of san francisco, not russia, that is all encrypted, we are seeing not just iphones that cant be cracked, but entire Communications Systems that are designed to be impenetrable, and were seeing those become the so when you ask a question like, how could they miss this, the technology is becoming a big enabler. Pelley john miller, Deputy Commissioner of the nypd. John, thank you. Its been only four months since the isis assault on paris that killed 130. Many of those terrorists came from that same brussels neighborhood that allen pizzey showed us. Holly williams is in paris tonight. Holly, what are the connections between paris and brussels . Reporter well, scott, there is suspicion, but at this point no confirmation, that 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 an isis flag and abdeslams fingerprints. That raised suspicions that another attack could be imminent. Pelley but all of europe paris attacks. How could this happen today . Well, scott, we dont know if there were any intelligence failures, but certainly one criticism that is leveled at european intelligence officials is that they dont share enough information because they dont trust each other. And thats 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. Pelley Holly Williams in paris for us tonight. Holly, thank you. How did isis succeed today with police hot on their trail . Well have that next when this expanded edition of the cbs if you suffer from a dry mouth, then youll know how uncomfortable it can be. But did you know that the lack of saliva can also lead to tooth decay and bad breath . Well, there is biotene, specially formulated with moisturizers and lubricants. Biotene can provide soothing relief and it helps keep your mouth healthy too. Biotene, for people who suffer from a dry mouth. To you, theyre more than just a pet. So protect them it kills fleas, ticks and mosquitoes. K9 advantix ii. For the love of dog. Constipated . Trust number one doctor recommended dulcolax use dulcolax tablets for gentle overnight relief in minutes and stool softeners for comfortable relief of hard stools. Dulcolax, designed for pelley Michael Morrell is our senior cbs contributor. Michael, if the four months since paris, authorities have been watching these neighborhoods in brussels. They have been raiding home, tapping phones. How did isis pull this off today . Scott, i think its a combination of two things. One, its a combination of how sophisticated these guys are. The investigative report showed the use of throwaway phone, sophisticated document forgery, the making of bombs in europe by bombmaking experts, the ability to move money around, the use of encrypted apps that Intelligence Services cant read, very sophisticated, right. Thats one reason. The other is the very large numbers of individuals were dealing with here. 5,000 people went from western europe to iraq and syria the fight. Some of them are still there. Some of them have died. Numbers huge. Put those two things together, its a very, very challenging problem. Drew pelley are you saying these guys are experts at what theyre doing . Theyre very good from my perspective, and they were trained in iraq and syria by pros. Pelley where are we now in the fight against isis . I think you have to look, scott,what they want to do, which is conduct attacks against us, and what we want to do, is stop them by degrading that capability. In the foreign. In the last four and a half months, scott, theyve had four victories, theyve brought down an airliner in the sinai, one of their affiliates. They conducted the attacks in paris, a directed attack. San bernardino, an inspired attack, and now brussels, either inspired or directed. Thats a pace of operations that al qaeda never dreamed of. Right. These guys are doing very well in doing what they want to do and were not degrading them. Pelley what in your view should be done in so, scott, i think there are two things we have to look at. One is the defensive side. Al qaeda went after symbolic targets on the far side of you had to get through scrutiny to bring down an airliner. These guys are going after soft targets on the near side of security. We have to push that security perimeter out. Number, two we need better intelligence on the defensive side. On the offensive side, i only know two ways to fundamentally degrade a terrorist organization. One is to remove rapidly the leadership from the battlefield and the other is to take their safe haven away. We have to pick up the pace on those two. Pelley Michael Morrell, former number two at the c. I. A. Michael, thank you so much. The f. B. I. Took immediate action today after the attacks. Well have that next. About what to avoid, where to go. And how to deal with my uc. To me, that was normal. She told me helps people get uc under control and keep it under control when certain medications havent worked well enough. 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Frank cillufo is a former white house Counter Terrorism 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 imitators. Reporter according to this report by the house Homeland Security committee, more than onethird of isislinked terror plots have been aimed at the United States or its interests overseas. 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 but just last week american Mohammed Jamal khweis surrendered to Kurdish Forces in northern iraq. He traveled from the washington, d. C. , region the syria to join isis, and he was not known to the f. B. I. What youre seeing right now bush. Youre going to have a number that wont necessarily be on anyones radar screen, and thats something we do need to be cognizant of. Reporter the couple behind decembers San Bernardino attack was not on the f. B. I. s radar either. Scott, today Homeland Security sent a bulletin to Law Enforcement agencies across the country warning of the potential threats from isis. Pelley jeff pegues in the washington newsroom. In a moment, the world honors the latest victims of terror. Then those places change every few months . I think ill pass. Quicksilver from capital one puts nothing in your way. You simply earn unlimited 1. 5 cash back on every purchase, everywhere. You cant dodge the question. When my chronic pain got bad, my doctor prescribed medicationan opioid. It really helped but it came with some baggage opioidinduced constipationoic. Sooo awkward. You sound like youre ready for the movantalk opioids block pain signals. But they can also block activity in the bowel, causing constipation. 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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 Brandenburg 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. Leaving us now for local programming, but for many of you this expanded edition of the evening news will continue in a momoment. A local woman who once called it home. Says this isnt the brussels she remembers. Tonight. With a family friend seriously injured in todays bombingher insights into the terror attack in belgium. Its a story youll only see on local 12 3 temperatures stay mild. But rain and storms are in our future. Ill time out the rain in your Weather Authority forecast. 3 thenthey mean business. And today they delivered the proof. Why an atf team and Cincinnati Police joined local 12 news live at this is the cbs evening news with scott pelley terror in brussels. Pelley this is a special expanded edition. For those of you just joining us, heres what we know about todays terror attack in brussels. At least 31 people were killed in coordinated bombings at the airport and at a subway station. 250 others were wounded, including americans. Isis is claiming responsibility. A search is under way for the man on the right of this photograph