Americans right now. The attacks taking center stage on the campaign trail. Donald trump winning big in arizona. And ted cruz takes all in utah. As the gop rivals get into a nasty war of words overnight over their wives. And Hillary Clinton and Bernie Sanders split victories in three states. The results coming in right now. We say good morning, america. New headlines on the brussels terror attack coming in. European sources telling abc news the third suspect has been arrested. Reportedly this man seen here with the other two many boers in the airport. Just now a moment of silence in brussels and across belgium. Amy robach is there and will report in a moment. Heres what we know right now. At least 31 killed in the three attacks, at least 250 hurt including nine americans and this morning the state alert for all americans planning travel to europe. Also happening overnight Police Conducting raids, this is new video where police say they found more explosive devices. And we want to go right to abcs Alex Marquardt at the Brussels Airport with the latest on the arrest of the third suspect. Good morning, alex. George. Thats right. This airport still shut down. You can see the belgian military area. What we learned two of the suspects seen on Surveillance Video, the suicide bombers are believed to be brothers and just a short time ago european officials confirming to abc news that the third man seen on that surveillance tape has been arrested. In force. The country at its highest alert level scanning an upper floor apartment, drones and helicopters hovering above. Overnight the raids stepped up focusing on the neighborhood of schaerbeek after shorts released this photo showing the men they yesterdays attacks. The three pictured shortly before the first explosion at the Brussels Airport around 8 a. M. Seening wheeling luggage on trolleys. According to belgian state tv the two on the left wearing all black with gloves on are believed to be the suicide bombers, brothers khalid and el bakraoui and a few minutes later they blew themselves up. The el bakraoui brothers were known to police for criminal activity but nothing related to terrorism. According to belgian state tv moments ago the third man confirmed arrested. Najim laachraoui seen here wearing white with a hat pulled down over his face pushing a large bag which is believed to have not detonated. Stay down. The two blasts here killed at least 15 and left about 100 injured including nine americans. About an hour later, another explosion seven miles away at a metro station. Wounding more than 100. And just after 4 00 p. M. , isis claimed responsibility. And speculation is mounting this morning that that third man arrested is the alleged bombmaker. Hes thought to have made the explosives used in the paris attacks that killed 130 people. His dna had been found in two safe houses here in belgium used by the paris attackers. Robin. All right, alex. Thank you. The latest on isis claiming that responsibility for the attacks and now a dramatic new terror alert for american tourists on further attacks as millions prepare to travel overseas. Brian ross is here with those details. Good morning, brian. Reporter good morning. With that state Department Warning american tourists could be at risk across europe and isis promising dark days ahead. Officials are bracing for what they are calling nearterm terror attacks by isis cells like the one that operated out of brussels. For more than a year isis been carefully planning for this moment. These three suspected bombers arriving at the airport prepared to kill. Part of what now appears to have been a major terror cell of at least 17 people involved in the paris. In fact, Authorities Say one of the brothers here actually rented the apartment for the long sought paris fugitive salah abdeslam. Officials believe the capture last friday of abdeslam triggered other cell members to move up their attack plans in brussels. If the plotters were concerned he was talking, that authorities were close to tracking them down they may have moved up the timetable. Reporter the aftermath of the explosions in brussels indicate simple homemade many bos of the kind seen in other isis attacks. They can make the mixture in the bathtub and have it completed within a day or so. Reporter but bomb experts say the blast in the metro stop was much more powerful than the explosives used in paris. Shows the bombmaker used threeinch metal bolts to create devastating shrapnel. No other reason but to kill and maim. Reporter athe tacks come at the beginning of the spring and summer tourist sports cycle. The state Department Warning for american tourists says terror groups are targeting sporting events, tourist sites, restaurants and transportation. And isis in its claim of responsibility said what is coming is worse and more bitter. Just what you referred to about those sporting events and that, a lot of americans are planning their summer vacations, up. Indeed, in fact the warning says american tourists should avoid crowded places and be particularly vigilant around major religious holidays, large festivals and events, precisely the reason so many go to europe in the first place. Thank you for that. Now to an american who survived those blasts. Sheerine naraghi was preparing to head back home to the u. S. We spoke to her shortly after the attacks yesterday and she joined us again just moments ago from brussels. I got up to the counter. Checking my bags. She handed me over my luggage tickets and they were still in my hand when i went to turn to jeff and thats when the first explosion hit. And then debris instantaneously was like everywhere. Dust, it was kind of like a whirlwind almost like a tornado had gone off inside the building as the second explosion went off he was pretty much on top of me, threw me to the ground. He stayed on top of me for awhile and then since i was near the checkin counter he shoved me up on the conveyer belt and the amazing American Airlines attendant grabbed my hand and pulled me with her underneath her counter so jeff was sitting on like the luggage conveyer belt. Jeff is your boyfriend and how you said how he came running towards you and he, you know, that you knew the ticket counter woman, that there was somebody there you were huddled with and hoping you would be able to get in touch with her. She was good to me when she didnt have to be. She was very sweet because i wouldnt let go of jeffs hand. He was trying to do the right thing to go see if it was safe for us to move because the one thing i know about safety, just stay in place i guess until you know its okay and i wouldnt let go of his hand and she kept holding on to me, its okay, he knew what he was doing. The humanity in moments like that we hear about those stories over and over again. You said you saw things as you put it you cant unsee see see but you had a little more time so memories are flooding back already. Seeing that little girl latch on to her mom and having like dust all over her coat and hair and that was i mean the things that nobody should ever have to see. Im sure your loved ones were so with them. What did you tell them. I told them i loved then. I cant tell them that enough. I get to go home and give them hugs again and some are not as fortunate. I feel blessed and lucky. We see all the people around you right now and people just really coming together. Everyone is so quiet, just what is it that you want to tell people back in the states about these times that were living in . Ive always realized there was threats and you see horrible things on the news and you know this world has a lot of evil people, but it just makes it so much more real and pressing and i just want everyone to be aware and like inform yourself about whats going on around you because i was going to the airport to come home and this happened and it can happen anywhere and i just want to make sure everyone is safe and just lives in the now i guess and is aware of their surroundings i think is the most important thing. Good words there, sheerine, thank you. You a safe journey home. Take care. Thank you so much. Bye. She cant wait to get home family . She said she was one of the lucky ones, one of many survival stories. Tales of courage and selflessness. We go to amy for more. We just witnessed an incredible moment here at the plaza here and the entire crowd here, hundreds have gathered broke into a large applause, all in honor of those who fell yesterday. People have been lighting candle, leaving flowers, writing messages of hope and solidarity and just a few moments ago i spoke with three Young AmericanCollege Students who are studying abroad and they were on their spring break here yesterday. They are among the hundreds who narrowly escaped yesterdays deadly terror attacks. What did you do . At first i didnt know what to do. Kind of running around trying to figure out the best route to get out. The bomb was just like a huge ball of fire and then we got out the door and sprinted as far as we could as fast as we could. You kept running. We kept running. Reporter this morning tales of survival emerging from the rubble. The debris was falling on us from the roof. We thought the roof was going to collapse. Reporter american physician laura bea triaged people with her friend. Pair of scissors i found i cut off so many hairs to find, you know, just massive shrapnel wounds underneath them. Reporter nine americans among the 100 wounded including three mormon missionaries, joseph empeys family grateful hes alive. We love him and are excited to see him again. Reporter this couple feared missing calling their family line went dead after an explosion. This morning, former Marist College university player, sebastian belon going into surgery for his left leg after the blast threw him 65 feet. His first word, dad and then he paused and he said, you have no idea what i saw around me. The carnage. Reporter di chem bemutombo was asleep in the passenger lounge when the first bomb went off and fled to safety mosting this, god is good. After the airport attack another explosion seven miles away on a crowded subway car. Brian carol from washington, d. C. On that train. Explosion. The lights went out. The power went out on the train. Reporter fearing the attacker might on on the train he helped pry the doors open. Get off the train and try to find safety. Reporter those three young me that yesterday ironically was supposed to be the greatest day of their life. They were headed to london to see adele in concert when the unthinkable happened and this morning, they say, they are just grateful and thankful to be alive, a sentiment shared by so many. I want to show you the cover of the paper here in brussels today it says tenir bon which is hold on. Its what so many are doing here. Just after noon in brussels and people are coming out in masses now and the restaurants are starting to open. Weve seen families pushing strollers, people are getting back to living their life. Hatred. Robin and george, back to you. So encouraging to hear that, amy. And describe for us, again, the scene that you just witnessed moments ago with the crowd applauding . Reporter there was a moment of silence here right at noon and so many gathered they just filled this entire plaza here and then when the moment was and it lasted for several minutes and you could just feel the strength in that unity here and, you know, the sign right here says united against hatred and there are messages in chalk all around me. The rain washed some of them away but i love brussels, just messages of hope and love and peace and thats what this community is gathering together to send to the world and theyre feeling the love from everyone. All right, amy, thank you. So much spirit there this morning. Well get back to you later, amy. Thanks so much. The brussels attacks have also triggered more security here at home. More police and military and airports, the subways in new york and key locations all across the country as they keep an eye out for terror cells in the u. S. Pierre thomas is tracking that side of the story from washington. Reporter today the fbi continues hundreds of terror investigations in all 50 states. Many involving suspected isis dozens are receiving around the clock surveillance. The fbi concerned that there could be copycat attackers who might respond to the brussels assault. There is good reason for concern. In the past 2 1 2 years at least 103 americans have been charged with trying to join isis or suspected of trying to support the group in some way. 82 men, 16 women, mostly young, half between the ages of 15 and 25. Ten teenagers from virtually every part of the country. Isis has done a very good job in attracting them in, radicalizing them and then getting them to think on their own. Reporter initially many were arrested for attempting to get to syria for jihad but increasingly suspects have been accused of attempting to carry out plots here at home. Garland, texas, suspects gunned down by police and tried to attack a conference featuring cartoons of the Prophet Muhammad and one in brooklyn modeled after the Boston Marathon carried out in San Bernardino where that killer couple allegedly swore allegiance to isis before gunning down 14 innocent victims. With americans among those injured in brussels, the fbi will be sending agent there is to investigate. Theyll be joined by members of the nypd as u. S. Law enforcement attempts to find out as much as they can about those horrific attacks. Robin. All right, pierre, thank you so much. David muir will be live in brussels tonight for a special edition of world news. Robin, moving on, the president ial candidates responding to those terror attacks this morning after a big night. Donald trump and ted cruz both land big victories, Hillary Clinton and Bernie Sanders swap wins too and abcs tom llamas is here with the latest. Good morning, tom. Reporter george, good morning to you. The way republicans voted last night shows this race is far from over and senator ted cruz getting a boost this morning receiving an endorsement from former rival jeb bush. This morning, a split victory in donald trump taking arizona, but senator ted cruz winning in utah. Their battles spilling over to twitter. Trump alleging cruzs campaign ran negative ads featuring his wife Melania Trump tweeting, be careful, lying ted or i will spill the beans on your wife. Cruz firing back, calling trump a coward. He is way out of his league. In he wants to get in a character fight he should stick with me. Reporter senator Bernie Sanders winning in utah and idaho and Hillary Clinton winning on the border. Im also very proud to have won arizona tonight. [ cheers and applause ] reporter but the voting on tuesday taking a backseat to the terror attacks in brussels. Gop frontrunner donald trump saying hed be open to torture to get information out of recently captured paris attacker salah abdeslam. He may be talking but hell talk a lot faster with the torture. Blasting trump saying torture puts our military and civilians in danger. What donald trump, ted cruz and others are suggesting is not only wrong, its dangerous. Reporter senator cruz with his own solution. Calling for patrols of muslim neighborhoods in the u. S. And so it is standard good policing to direct your resources to where the threat is coming from, we should do the exact same thing with radical islamic terrorism. Reporter and now there is a bit of a break in the race. The next big primary, april 5th which is the wisconsin primary. Also an important state when it comes to the general election as you know, guys, a battleground state and a lot will be working hard there. Quickly to ginger. Straight to your stormy cities brought to you by chico people from that train and what we can all learn from them. Hulk hogan oneonone, his first interview on camera with linzie janis since a jury awarded him 140 million. 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