Mystery man on the right of this photograph, who along with the two on the left, pushed devastating luggage bombs into the airport. It appears that this is the same isistrained terrorist cell that attacked paris in november. Charlie dagata has the latest on the investigation. Reporter a day after twin terror attacks, belgian officials warned the danger isnt over. In the mayhem of the airport bombings, one of the suspects fled and is still on the run. But tonight weve learned that Najim Laachraoui, the terror cells bomb maker, may have been among the suicide bomber killed at the airport. He is thought to be the man on the left. His d. N. A. Was also found on at least one of the suicide vests used during the paris attacks last november. Earlier tohay prosecutors released two more names, Ibrahim El Bakraoui in the middle blew himself up at the airport, while his younger brother khalid detonated his explosives on the subway train. Those brothers had criminal histories but werent on the radar of counterterrorism police. The man in the hat who got away left behind a bomb in his luggage. Had it gone off, police said it would have been the largest of the three. Raids continued throughout the city. One turned up 33 pounds of high explosives as well as detonators, a suitcase full of nails and screws and an isis flag. Amidst the anger, belgium was also nation in mourning. At midday, silence fell across the capital, a tribute to the lives lost but also in solidarity. Like brussels resident marijke calsius. Im sad for the world right now. Its only beginning. Its all over the world, and now brussels. That scares me. Reporter it hurts the heart, said sadia hanif. Were very sorry for what happened. As night fell tonight, crowds grew, ignoring warnings to avid large gatherings, a show of defiance. Now, news that the bomb maker Najim Laachraoui might have been one of the suicide bombers at the airport is highly unusual, scott, but fears that the leads were closing in might have explained why he took part. Pelley charlie dagata, thank you very much. As charlie said, the timing of yesterdays attacks may have been forced by the pressure that Belgian Police were putting on the terrorists. Last friday they raided a brussels apartment and arrested one of the paris conspirators. That raid turned up the names of the two brothers and the hunt for them was on before they attacked the airport and the subway. Holly williams has more. Reporter this apartment in a quiet brussels suburb may have been an important clue that came too late. It was rented under a false name according to belgian media reports by a man who turned out to be one of the suicide bombers, kahlil el bakraoui. He and his brother ibrahim, who blew himself up at the airport, were belgian citizens with a history of Violent Crime but were not known to be linked to terrorism until last week. When a police raid turned into a gunfight at the apartment. One suspected terrorist was killed. Two others escaped. Inside the apartment here, investigators say they found ammunition, an isis flag, and most importantly, the fingerprints of salah abdeslam, the alleged logistics man behind the paris attacks. That led to abdeslams capture three days later, but the apartment may have also linked him with the bakraoui brothers. The ammunition raised fears that another attack could be imminent. But less than a week later, before they were found or stopped, the two brothers carried out their deadly plan. And a laptop computer discovered by police yesterday, Ibrahim El Bakraoui wrote that he didnt know what to do and feared hed end up in a prison cell. Connecting the dots in a case like this one is not easy work, especially when the Belgian Intelligence Service has been criticized as underfunded and understaffed. Meanwhile, scott, by some estimates belgium has the highest per capita number of fighters that have joined extremist groups in syria amongst all western european countries. Pelley Holly Williams in brussels tonight. Holly, thanks. A dozen americans were wounded yesterday, and Vladimir Duthiers has learned more about them. Reporter late this afternoon sheila shults of odessa, florida, was still awaiting news of the fate of her son and daughterinlaw. Ive been hoping that my son would ring and justin or stephanie would be on the other end telling me they were okay and for me not to worry, they were fine. But that call didnt come. Reporter justin and Stephanie Shults have been missing ever since the bombs went off at the brussels airport. The wait also continues for the family of siblings sascha and alex pin pinczowski, both from new york city. Both remain missing. They were on the phone with family when the bombs hit. More is known about the mormon missionarieser isly is injured in the crash. The son of 66yearold Richard Norby told cbs news he is now in a medically induced coma after surgery on his head and leg. 19yearold mason wells from sandy, utah, had surgery on his foot and has been moved to a burn unit. Parents chad and kimberly wells. Its a nightmare phone call you never want to get that your son has been involved in a terrible accident. So you just try to go through the check list mentally and, okay, first of all, condition, health. Second of all, location. Third, how are we going to help him. Reporter according to European Press reports, american karen karen northsheid, who is a personal trainer in brussels, is in intensive care but expected to live. I saw a lady come with a cut on her eye. She was bleeding all down her face. Reporter 55yearold american missionary jeff slaughter was on his way home to shreveport when the bombs went off. He ran out of the building and straight to safety. You brain cannot process everything at once. Its too much information. Reporter the americans are among 150 victims still in hospitals around brussels tonight. 61 of those are in intensive care. Scott, a doctor at the hospital behind me said the injuries we minded him of those youd see in a war zone. Pelley and vladimir will have continuing coverage from brussels tonight on our digital news service cbsn. Vlad, thanks very much. In the raid on the suspects apartment, police found a homemade explosive called tatp. Terrorists like it because it is maid with household chemicals like nail polish remover, ingredients that dont raise suspicion when theyre purchased. Kris van cleave reports that american researchers have a new device to detect it. Fire in the hole. Three, two, one. [explosion] wow. Reporter dr. Jimmie oxley is the director of the university of Rhode Island Center of explosives detection. The university has been given a 1 million grant by the department of Homeland Security to come up with a sensor for the highly central tile explosive tatp. You dont need pounds to cause a catastrophic failure. [explosion] reporter it took only onetenth of a pound of tatp to rip apart this car door. Last night Belgian Police seized 33 pounds of the explosive. Thats 300 times more. Tatp is made with Hydrogen Peroxide and acetone, items easily purchased at a drugstore. For years weve relied on bombsniffing dogs to detect tatp, but with long hours and fatigue, they have their limits. This is the digital dog. Reporter from this campus lad, professor otto gregory design the sensor that detects tatp. Its an electronic trace detection system that can do and compete with a dog, but it doesnt need a break in a sense, so it detects 24 7. Reporter gregory says in close spaces like airport, the sensor can detect amounts as small as one part per billion. He held this vile, which contained trace amounts of tatp. Within seconds this computer graph spiked alerting to the presence of the explosive. Reporter the sensor is sensing what youre holding if your hand. Thats correct. Reporter do you feel a renewed sense of urgency to get it out there . I do. I do. We would like to get it out there yesterday. Reporter the device will begin realworld testing later this year. Scott, the goal is to get it down to the size of a smartphone so it can be mounted on a turnstile or worn by a police officer. Pelley kris van cleave, fascinating story. Kris, thank you. In the president ial race now, republican ted cruz was eastbound doored today by jeb bush. Cruz won yesterdays primary in utah. Donald trump won arizona. Cbs news estimates that trump now has 735 delegates, about 60 of the 1,237 needed for the nomination. Cruz has 447. The campaign focused today on protecting the homeland and Dean Reynolds has that. Reporter on cbs thinks morning, ted cruz was pressed to elaborate for his call on special Police Patrols of muslim neighborhoods in this country. It raises a lot of civil liberty concerns. Let me ask you, how many muslims are in america. I dont know the number off the top of my head. So youre saying Law Enforcement should surveil a number of muslims, and you dont know how many muslims are in america. There are three million muslims many america. Name one community where there is a large group of radicalized muslims. You have communities in minnesota and michigan with heavy concentration, and you have incidents of radical imams preaching jihadism. Reporter donald trump, who would suspend muslim immigration here, said he could support such targeted surveillance, but Ohio Governor john kasich rejected the idea. So too did president obama. The notion that we would start down that slippery slope makes absolutely no sense. Its contrary to who we are. Reporter new York City Police commissioner William Bratton was less restrained. There are muslims living in new york city. I have several thousand including almost 1,000 new York City Police officer, many of whom are veteran, many of whom are combat veterans, so for him or any president ial candidate to disparage the men and women who are working to secure this country and this city, shame on them. Reporter and speaking of shame, the Political Campaign veered into the personal again today with trump and cruz exchanging insults and epithets over the treatment of their wives on social media. It involved revealing photos of one and threats to spill the beans about the other. A fight, scott, that is unlikely the alter the course of this race. Pelley Dean Reynolds, thank you, dean, very much. Well, the course of the democratic race was also unchanged after yesterdays voting hsm k is Hillary Clinton is pulling away. She is campaigning on a different view of counterterrorism. Heres nancy cordes. Loose cannons tend to misfire. Reporter speaking at stanford university, the former secretary of state portrayed herself as the experienced alternative to trump and cruz. One thing we know that does not work is offensive, inflammatory rhetoric that demonizes all muslims. Reporter she said torturing prisoners, as trump has proposed, doesnt work either. Im proud to have been part of the administration that banned torture. Reporter the chair of the Republican Party took a dimmer view of her record, saying, Hillary Clinton and president obama have been wrong about isis at every turn, which has resulted in more attacks. Thank you all. Reporter clinton was one for three last night, winning easily in arizona but losing to berrernie sanders by landslide n two other states. What happened yesterday was a disgrace. Reporter he was talking not about the outcome but the fivehour lines to wait in mare cowhat county after officials slashed the polling places from 200 in 2012 to 60 yesterday. Whoever manipulated this is playing with our political system. And for people to have the stand in line for hours to vote is insane. Reporter some predominantly latino neighborhoods didnt have any polling places, which led to accusations of voter supression. Local voting Officials Say they simply underestimated turnout, but, scott, tonight the mayor of phoenix is calling for a federal investigation. Pelley apparently they cut some of the voting places to save money. Nancy cordes reporting for us tonight. Thank you, nancy. Can obamacare require contraception coverage . The Supreme Court heard the case today. And well remember Joe Garagiola when the cbs evening news continues. Ure talking to a rheumatologist about a biologic. This is humira. 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Reporter for sister constance viet, the issue goes beyond the Little Sisters of the poor. If our religious liberty can be disregarded, then, you know, whats to prevent the government from disregarding anybody elses sincere religious faith . Reporter at the Supreme Court, it was a clash between religious freedom and a womans access to contraception, and the justices aperiod deeply divided. Liberal justices worried there was no stopping point, any religious objection to paying taxes or serving in the military could be brought. Justice sonia sotomayor, how will we ever have a government that functions . The government had given the Little Sisters an out, simply sign a form, letting the government step in and order the nuns Insurance Company to provide contraceptive coverage, but the Little Sisters argue they would still be complicit and conservative justices seemed to agree. Said chief justice john roberts, they think that complicity is sinful. Now, without justice scalia, the Court Appears divided 44. A tie vote could keep in place those rulings against the Little Sisters, but, scott, it would set no nationwide precedent. Pelley jan crawford covering the court tonight. Jan, thanks so much. Jan, thanks so much. A blizzard buries spring. Thats next. M. What were building together. And could this happen again . I was given warfarin in the hospital, but wondered, was this the best treatment for me . I spoke to my doctor and she told me about eliquis. Eliquis treats dvt and pe blood clots and reduces the risk of them happening again. Not only does eliquis treat dvt and pe blood clots. But eliquis also had significantly less major bleeding than the standard treatment. Knowing eliquis had both. Turned around my thinking. Dont stop eliquis unless you doctor tells you to. Eliquis can cause serious, and in rare cases, fatal bleeding. Dont take eliquis if you have an artificial heart valve or abnormal bleeding. 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Pelley a spring blizzard has dropped more than 16 inches of snow in boulder, colorado, and grounded planes in denver. Barry petersen is there. Reporter call it the winterweather version of march madness, a storm that dropped more than 20 inches of snow in some areas and sent hundreds of cars and semis skidding and blocking traffic fro