Im Alisyn Camerota live in brussels. This is where the public has come out to celebrate the memorial for the victims of yesterdays terrorist attacks. Chris and michaela will have more in a few minutes. Belgian authorities identifying the two suicide bombers who detonated the two powerful explosives inside the hall at the airport. A massive manhunt is under way for a third suspect. The suspect to the right of this picture in the lighter jacket. His bomb they believe failed to detonate. The u. S. State department is warning of nearterm attacks throughout europe. They are set to observe a moment of silence one hour from now. Senior International Correspondent nima joins me with the latest. Great to have you here. What have we learned about these brothers . They are believed to not only have been involved with the attack on the airport. It was their dna found in that apartment that triggered all of this last week. They were found along with a cache of weapons. They eluded capture. Let me walk you through how all of this unfolded. This unidentified man, a key suspect, remains at large after coordinated terror attacks that rocked brussels on tuesday. Two of his accomplices captured on airport surveillance cameras are presumed dead. A senior Belgian Security source tells cnn they are brothers known to police, suspected to have ties to the paris attack. The pair thought to be suicide bombers detonating two bombs inside the departure hall at the Brussels Airport. The horrifying moments after the blast captured in this cell phone video. We saw doors flying, glass, ceiling coming down and smoke and everything. The man at large left behind a third bomb concealed in a suitcase that was later detonated by the bomb squad. Now investigators want to know if he traveled just a few miles away to carry out the Second Attack at Maalbeek Metro station an hour later. That blast charring a subway car. I felt an explosion and the train stopped . Its tracks. The lights went out. The power went out. Everyone dropped to the ground. They were screaming. The station just blocks away from a number of European Union landmarks, including the european parliament. Isis claiming responsibility for the attacks. The first victim to be identified was killed during the attack in the airport. Originally from peru, she lived in belgium six years. She was in the airport with her husband and twin daughters. We will do our best to bring to justice those who are responsible. And this is yet another reminder that the world must unite. The world lighting up in belgian colors, vowing never to let terrorism win. At first this is just what authorities believed they know now in the first 24 hours of the investigation, alisyn. So much is still evolving. We are waiting to hear from the prosecutor later today. We will talk more in a second. But first the major break in this investigation came from a taxi driver who had actually picked these men up. He recognized them in the airport surveillance picture that was released he said he took the trio to the airport and that alert led to the new raid in belgium. Thats where we find our cnn Senior CorrespondentFred Pleitgen. He is outside the bomberss apartment. Tell us the clues that were in there, fred. Reporter there were weapons found inside here. The apartment that im at right now, alisyn, was raided by the police last tuesday. In this apartment, what they thought they would find was an empty apartment. But they found three people inside who immediately opened fire at them. When they came here, they werent expecting anybody to be here. Thats why they didnt tack a s. W. A. T. Team. Two of the people who were inside got away. It is now believed that the two people who were in the apartment may be the brothers who conducted the attack at the airport. Police were close to cornering these two people. They had them cornered. However, they managed to get away. What happened after the attack at the airport, the taxi driver called the police and said the three people youre showing on the tv, they are the three people you have on tv. I have them. They refused to let me carry the suitcases. When he picked them up in schaerbeek, they had way too much luggage with them and had to leave some of it behind. He notified the police. The police went to the location, they conducted a raid for seven hours. There were choppers in the air, snipers in the air. In the end, they went inside. They say they found a nail bomb in there, chemicals, isis flag as well. So it appears to the authorities that apparently the apartment that was raided last night may have been the one that was used to make the explosives used in the attack at least for the airport, alisyn. Okay. Fred, thank you for all that. Stick around. We have more questions for you. U. S. Officials are lending a hand in the manhunt for the elusive suspect behind they believe the airport bombings and any others who might be linked to these attacks. Evan perez is live in washington with more. What have you learned, evan. Good morning, alisyn. U. S. Counterterrorism analysts are helping them dig into the background of multiple people believed to have a role in the attacks. They provided the names of people of interest in the last few hours. Now those names are being run through data bases of expected extremists. They want to know everything, past travel, their friends, and their associates. Today there is a race against time to try to find as many members as possible believed to be part of a Large Network connected not only though to these attacks but other plots including the paris massacre. U. S. Intelligence officials repeatedly told me they were expecting a major attack in europe. There is a state Department Travel warnings in the region. Officers from the new York Police Department are arriving in brussels this morning to help with this investigation. Okay, evan, thanks so much for that. Heightened security across the United States in the wake of the brussels terror attack. From los angeles to new york, police are guarding highprofile targets today. Brynn is live at one of the busiest transit hubs in the nation. Brynn, what do you see there . Reporter certainly it is, alisyn. We just had a candid conversation with a transit officer for amtrak. He basically said there are five agencies working in concert just in this building alone at penn stati station. Of course as you mentioned, height especiallied measures all across the country at this point. Transit hubs, airports, train stations, and maybe the most notable here in new york city where the nypd briefed cnn on all the measure its been taking since yesterday. It bolstered its efforts of the attacks yesterday in brussels. That includes many counterterrorism teams. They are working together to make a show of force but also act as a deterrent to anything that could happen as they always had a target on its back. Basically those are moving about the city, working together, heavily armed. Many times they have canine units that cancan sniff out bombs that left certain areas that are vulnerable and possibly sending out vapors. But the big thing to note, alisyn. There is no credible threat in new york city at this point. Okay. Very good to know, brynn. Thank you for all of that. Lets get the latest now on the investigation and the search for the elusive suspect. We want to bring in cnn Senior Correspondent nima and Fred Pleitgen. Fred is at this location where a raid was on tuesday where they found a cache of weapons. Is it fair to say, as some have said, that the belgian authorities missed something . I think the question everyone will be asking is about these brothers, back rouxy brothers. We are talking about heavy crimes. If these men were on the radar so to speak and police were familiar with them and were aware of their links to certain extremist elements, why werent they being monitored more closely . Nima, i want to ask about the subway attack. That seems more mysterious. At least 15 people were killed there. We dont exactly know who we think was behind it. They say it might have been one of the brothers. But they might have blown themselves up at the airport. How do we know if they are looking for someone from that element of the attack. They have not released any imagery. We have seen that still surveillance image from the airport. Thats part of the reason there is a sense of almost secrecy around this. But we know post paris authorities believe the information they were putting out was part of the reason Salah Abdeslam was able to evade capture for so long. They are being very, very careful. There are so many interlinking networks. There is evidence authorities believe to link them to the paris networks and part of this new network that Salah Abdeslam was supposed to be building around him to launch attacks here in brussels. You have this lattice work of extremists cells, extremist networks. It is so painstaking for authorities when they are in a race against time. Yesterday the belgian authorities asked the media not to disclose a lot of information about where the raids were happening and about their investigation. It reminded me that after paris we watched live on television authorities raid an apartment. Thats something we would never do in the United States. We would never have cameras trained on the raid. There again, you are in front of the apartment that the bombers appear to have repeated. And now there is a connection between paris and brussels. Yeah. They certainly are. Youre absolutely right. It is one of the things that authorities did yesterday. They told the media to refrain from filming or being present in any of these raid. When we were in paris, they were taking place in almost realtime on tv. Here they were a lot more restricted. They created a large cordon. They had a chopper overhead for a long time. Snipers in that chopper. But you really didnt see very much beyond that. The cordon was two and a half miles in diameter. It was around the main Railway Station there. We didnt see is the street that apartment was in. What authorities do is they make it a lot smaller very quickly. They want people to be able to go back into the area. You could see some of the forensic work going on at that apartment. It was going on all night. That is something we certainly did see. The search for Salah Abdeslam, so much was appearing in the media, it may have made it easier for the suspects to remain on the run. There were about 100 raids conducted in some way, shape, or form connected to the terror attacks. Also looking for him. In the end he was found literally one block from where he grew up with people he had associated with since his youth. So it has been very difficult. Certainly there are some who believe a lot of information that was made public made it easier for some of these people to evade capture. Just so striking to hear where he was found after all of that search. We keep hearing how many people may have been radicalized. What is the focus now of investigators. I think the main focus is the man with the white jacket, hat, and glasses. We have seen his image of and over. That freeze frame at the airport. We know he arrived. He appeared to have an explosive device. We dont know exactly why it didnt detonate or why he didnt flee the scene. He was certainly the primary focus of this manhunt. There is a secondary focus as well. That is the socalled paris attacks bomb maker known as najim lash raw wii. They are desperately trying to find him as well. New information, breaking news just coming into my ear. They want you both to know an arrest has been made of a man they believe is connected to the brussels attacks in the anderlus. They are not saying who it is. If this is the person we see in the photo. This just tells you investigators have spread out this spider web of a dragnet. Every hour there is more information. What does this tell you . Well, the Prime Minister has been clear from the beginning. They are searching everywhere. Some of these searches will be fruitful, and some wont. It reflects what we were just discussing how tight they are trying to keep this. They will acknowledge arrests. They will know it is in the public domain. It is a delicate balance to keep people calm. I want to talk about the victims for one second. Here we are. This is the public memorial. In less than an hour there will be a moment of silence. This is where the vigil happened overnight. And you saw it. What were people doing here last night . What were some of the symbols they were leaving . People just drifted towards this. You saw the candlelight just illuminating as it got a little darker. Overnight, there were two extraordinary ladies draped in the belgium flag watching, making sure none of the candles would go out. They said people cared enough to come here. We dont know, maybe someone who lit these candles lost someone. They almost felt it was a duty to keep the candles lit through the night. It was only after sun break they packed up, took their flags and went home. Again, this is becoming a focal point for people here. So many of those were speaking to felt like there was a spectre of the city all of these months and it happened. Finally the worst you could imagine has happened. And youre still standing. Thief had he been washed away because its been raining. The messages of we love you, were standing with you, please dont let this divide us. Inspiring that everyone is out here and now cowered by the fear. Chris, it is busy here at the square. Its not just here. We have seen people getting back to normal life. Mothers pushing strollers. People are trying to get back to their normal lives here just one day of the attacks. All right, alisyn. Back with you in just a bit. We want an update on the election last night. Four of the final five coming up winners depending how you look at it. We will break down the results and what it all means for the campaign right ahead. This iin my 20s,ers saw me. I was super irresponsible with credit cards. It was time for experian. They gave me tools so i could finally get serious about my credit. Now lenders see me for who i really am. Go to experian. Com and start your credit tracker trial membership today. Virgin islands nice so nice so nice, so nice spend a few days in st. Croix and return with a lifetime of experiences. Thats Virgin Islands nice. So nice, so nice that are lighter in calories and added sugar when you use splenda no calorie sweetener. 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Accelerating transformation. Accelerating next. Hewlett packard enterprise. Ricky Gervais verizon is the Number One Network in america. I know what youre thinking, they all claim stuff like that. Yeah, but some of them stretch the truth. One said they were the fastest. We checked, it was fastest in kansas city and a few other places. Verizon is consistently fast across the country. You wouldnt want to hear from the bloke who packs your parachute, its good over kansas. Do you know what i mean . So thats, you know. Anywhere else, splat. Only verizon is the 1 network for consistently fast speeds. And now if you buy a Samsung Galaxy s7 edge you get one free. We have information coming in about the arrest in belgium. Lets turn to the elections here in u. S. Impressive evening for Hillary Clinton and donald trump. Both scoring major victories in arizona. Five important races in three western states. A big part of the story, voter turnout. Lines stretching for a mile or more in some places. One of the places ran out of ballots. Dont say folks arent engaged. Pressive turnout. Big night for senator ted cruz claiming all 40 delegates after taking 69 of the vote. Just 14 of the vote. He will not receive any delegates in that state. South of utah to arizona, we see that donald trump dominated arizona 47 of the vote. He will take all 58 delegates there because it is a winner take allstate. Totaling up to this hour the trump im calling him the trump now. Donald trump inching closer to the number of 1,237. He has 741. Cruz behind in 461. John kasich 145. He gained no new delegates. If we turn to the democrats. Bernie sanders picked up two states, winning in idaho. 78 to clintons 21 . He also took 79 of the vote in utah to clintons 20 . Clinton capturing the biggest prize in arizona. 58 of the vote there. It is worth noting while sanders won two of three democratic contests, they had far fewer delegates. None of them were winner take all. So the count for the democrats delegate count right now 1,7eleven for Hillary Clinton. Bernie sanders, 939. Thats the magic number to achieve in order to win the nomination, chris. Important numbers. Important news out of brussels. Word of an arrest. We are working the details right now. As soon as we get them, we will give them to you. No question the brussels attacks did play into the western primaries in the western election. Lets bring in Senior Editor for the Atlantic Ron Brownstein and cnn politics executive editor mark preston. Who wants the gop . Which one of you wants to do the analysis from the gop . If you look at whats coming forward, sure, she will trade