city police will be getting help from state and federal agencies. this will be the largest ncaa men's basketball championship crowd ever. with the other final four activities, houston expects hundreds of thousands of visitors. and ice is threatening other countries which take part in the u.s.-led military coalition. the terror group promises dark days for countries aligned against the islamic state threatening what they say is coming is worse and more bitter. how is the war against isis being waged? here's abc's martha raddatz. >> reporter: the air strikes have been constant. from the sea, from the land. >> we're out here to take out isis so it doesn't matter where they're at. we're going to eliminate that threat. >> reporter: surveillance drones and cold war era spy planes patrolling the skies to help locate targets. the ground war, too, has been more effective. isis losing 40% of its territory, says the pentagon, but there are estimates that 30,000 isis fighters are still spread through

>> have a safe flight. >> reporter: we tacked one night mission from start to finish board the usa truman. f-18s flying over syria to destroy an oil pipeline, a revenue source for isis. >> three, two, one. a refueling mission mid-air over stormy skies and hostile skies. lightning striking all around. >> three, two, one. >> reporter: we met with the pilots on the flight line seconds after returning safely to the deck. >> it was not exactly routine. but we got the results we wanted. >> reporter: the u.s. says intelligence has improved in the military fight, especially with more u.s. troops backing up iraqi troops. and while the pentagon says that isis is weaker and on the defensive, the pentagon is the first to say that defeating isis will take more than military might. martha rad dads, abc news, washington. and our coverage on the brussels attack doesn't end here. coming up, the

victims and how the city is coping with grief. that's later this half hour. we're also tracking primary and caucus results come in right now from utah, idaho and arizona. ted cruz has won the utah republican caucuses. donald trump likely coming in third there. >> those results just coming in. republicans in arizona have given a landslide victory to donald trump who gets all of the state's 58 did hes. as for the delegates in that state, they give hillary clinton the win who also adds to her delegate lead over bernie sanders. but sanders doesn't end the night empty handed. handily winning with the utah and idaho democratic caucuses. coming up right here, we're going to return to our top story and how brussells is showing strength while coping with this grief. >> also ahead, criticism for president obama going to a baseball game in cuba after at brussels terror attacks. what was his explanation and was it enough. and later, apple security showdown over a dead terrorist locked

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welcome back. some other headlines now. a utility worker is dead after a construction accident in southern california. he was crushed between a crane and a trailer. accident occurred near an area that's seen a construction and redevelopment boom in recent years. and we have a health alert this morning involving prescription pain killers. the fda planning to add a boxed warning to all immediate release painkillers including more than 220 named brand and generic drugs, many of them oxycontin based. it's meant to

addiction often blamed for the growing heroin epidemic. new guidelines for prescribing the drugs were announced a week ago. >> fresh supplies heading to the international space station following a launch i've cargo rocket from cape canaveral in the light of a nearly full moon packed with 8,000 pounds of food, equipment and scientific research for nasa. it is due at the space station on saturdays the. >> it was a beautiful nighttime launch about 11:00 last night east coast time. very nice. after a historic visit to cuba, president obama moves to the next nation on his itinerary. argentina. >> air force one landed in south america with the first family preparing to spend the day in the capital city of buenos aires. as serena marshall reports, his stop in cuba is still very much the focus. >> reporter: president obama's final day in havana, markds by far away

about the brussels attack. hours later addressing the cuban people but only a brief mention of the bombing. >> the thoughts and the prayers of the american people are with the people of belgium. >> reporter: before continuing his cuban push. >> i have come here to bury the last remnant of the cold war in the americas. >> reporter: the president pleating with dissidents and using baseball diplomacy as the two leaders watched, joked and took in the baseball traditions, obama telling espn why he didn't go home immediately as political rivals suggested. on a day marked by tragedy watching the game was so important. >> what they can doing is scare and make people afraid and disrupt our daily lives and divide us. and as long as we don't allow that to happen, we're going to be okay. >> reporter: ending his day in cuba with castro seeing him off. continuing on to argentina, landing overnight, he will spend the next two days with newly elected

macri. the trip will also include a first family visit to patagonia possibly taking in one of their famous glaciers. unlike his visit in havana, in argentina he can expect a more controversial welcome. more than 10,000 people expected to come out and protest. his visit coming on the 40th anniversary of the military coup known as the dirty war. serena marshall, abc news, havana. >> president obama at that baseball game was talking about one of his proudest moments in office was when boston united following the attacks there. he pointed specifically to red sox david ortiz for saying they won't be intimidated. >> he's getting a lot of heat for going to the game. i distinctly remember in the days following 9/11 president bush was saying go on with your lives, go to disney world. spend money. do not let them disrupt our lives at all. >> broadway opening up shortly after the attacks to

message to say they will not have this one over people. >> there was a moment of silence at the game and there will be on capitol hill today. a lot of people remembering what is going on in belgium. coming up, terrorists and technology. >> the battle to track suspects electronically is getting even more difficult. that's next on "world news now." >> announcer: "world news now" continues aft

welcome back. as investigators dig deep into how the brussels terror attacks were coordinated a new turn in the latest deadly case at home. >> apple is refusing to help the government as it tries to unlock

only now the government says they might not need the help after all. here's abc's neal karlinksky. >> the hunt is on to dissect every moment of these three possible terror suspects' lives a search that will run straight through their cell phones as law enforcement struggles to uncover their digital footprints. investigators faced the same challenge last year in paris uncovering a huge stash of disposable cell phones can activated one day before the attacks. investigators continue to struggle to unravel the iphone used by said farouk. the justice department says it may not need apple at all. and telling a judge an outside party demonstrated to the fbi this past weekend a possible method for unlocking the phone. apple has fought the government's attempts to force it to weaken iphone security so in

>> we have a responsibility to help you protect your data and protect your privacy. >> but it's not just apple. there are a number of encrypted third party messaging apps known to be used by terrorist and law enforcement worldwide is struggling to keep pace. neal karlinksky, abc news, cupertino, california. big mystery who was that third party. >> that is the big mystery. >> apple so far sound a little skeptical of lou the third party will break into it. there was a conference call on monday. they were saying the company wants more information about the method used to break that iphone. i don't think they quite believe it is possible. >> my iphone did break over the weekend. cracked in the middle. >> not somebody hacking into it. >> no, but cracking is devastating enough. >> okay. all right. >> got to get that fixed today. >> there is that first world problem we'll call it. >> coming up, the world rallying around bru

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spray 'n wash. back 'n better. eiffel tower lit up in the belgian flag colors. even 1 world trade center new york. as the smoke clears in brussels more questions than answers remain. >> we take stock of the incredible displays of strength seen throughout the day. here's abc's juju chang. >> iconic landmarks around the world from the eiffel tower to 1 world trade center. a light in black, yellow and red. s a wash in the colors of afation bruised but not broken. those grieving in brussels coming together in the streets with messages of unity written chalk. a temporary tribute

forever. and in cuba, president barack obama calling for global solidarity. >> this is yet another reminder that the world must unite. we must be together. regardless of nationality or race or faith in fighting against the scourge of terrorism. >> reporter: in our nation's capital, the american flag lowered to half-staff. >> all sing it with me, all right? ♪ with the rain blowing in your face ♪ >> in london adele offering this moving tribute to the victims performing "make you feel my love" in their honor. and in france, a cartoonist for lemomnd with a simple message. paris and brussels bound together in a somber similarity. pray for belgium shared

millions heard the voices of those who lived through the harrowing hours. >> i can still feel the first blast. >> recounting the horrific moments when survival was uncertain. >> it was the worst nightmare you could imagine. >> reporter: but perhaps more importantly, the true nature of human at this time that can shine bright even in the darkest times. >> it was really the sense of humanity that emerged in the sense of chaos to me shows that these types of things don't defeat the human spirit. >> so true. after the terror so often, you see incredible heart-warming stories thinking about the airport worker who reportedly pulled seven people to safety. how across the world leaders have come together to show their solidarity. >> it was just about 24 hours ago that terror rained down on brussels, belgium. that's the news for this half hour.

this morning on "world news now," the search in brussels for an isis bomber. >> from the manhunt to the human toll to the travellers who feel vulnerable worldwide. live coverage coming up. terror investigation. who were the men responsible for the brussels bombs? new details about their isis network. and which targets could be next. paying tribute showing strength in brussels with heartfelt memorials to the victims. the city in grief trying to heal. and our other major story, long lines at polling places in three states. the candidates talk terrorism while donald trump and hillary clinton have an eye on the delegate counts. it's wednesday, march 23rd. from abc news, this is "world news now." . >> good morning, everybody.