way less time. "nightly news" begins right now. >> announcer: from nbc news world headquarters in new york, this is "nbc nightly news" with lester holt. good evening. there are late developments in a tense and frightening encounter this afternoon at a baltimore television station where a bomb scare ended with police opening fire on a suspect. employees fled the station after the costume-dressed man displayed what appeared to be a bomb with a car set ablaze in the parking lot, the suspect emerged and confronted by a police tactical team. nbc news pete williams has details. >> there is the video. >> reporter: police say early this afternoon a man wearing an animal costume, a surgical mask and sunglasses walked into a fox television station demanding to air a government conspiracy theory. he had a bomb vest and said he had a bomb. the building was e having waited. >> he said i don't want to hurt anyone, i don't want to hurt you but i want my message to be heard. >> reporter: just before walking in police say he set his car on fire. some pictures live streamed by a station employee on social media. he then walked out of the station where police were waiting when they told him to show his hands, he refused and police say they fired at him when he wouldn't stop. >> when he walked out on the street, he posted a threat this to this community and officers and they were forced to use their real guns to shoot the suspect. >> with the man lying on the ground, robot devices were called to remove the vest and he was carried into an armored vehicle and taken to the hospital for treatment of gunshot wounds. >> it's become all too common in america for us to gather like this to examine the bizarre dangerous behavior of a singular individual. >> tonight authorities say no explosives were found. they say material stuffed into the van's vest was candy barred wrapped in aluminum foil. >> thank you. dramatic raids on the other side of the country today. the fbi moving on the brother of one of the san bernardino killers. a sham marriage conspiracy and secrets and lies under oath. nbc's joe fryer explains. >> reporter: before dawn, the fbi and local authorities moved in on two homes arresting three people with dies to san bernardino shooter syed tfarook's his brother, wife and the center of a sham marriage. she is married to enrique marquez. provided the guns. the marriage between marquez and turnic was arrangeed to stay in the u.s. she paid marquez $200 a month and didn't live with him. in fact, she actually lived with another man. the charges filed in court say last november marquez and turnic discussed mutual anxiety for the upcoming immigration interview due to the lack of contact with each other. prosecutors say he was concerned for being in prison for fraud. authorities say the other two suspects were in on the sham. the three in court today are not charged with terror-related offenses. they felt remorse after the shooting. >> they have no control of what their brother did. >> reporter: so far no indication others were involved in the terror attacks carried by s syed farook and his wife. let's turn to the 2016 race and harsh words from ted cruz. john boehner caught in tape in an unguarded moment revealing what he really thinks of the man trying to stop donald trump calling him lucifer in the flesh. boehner didn't stop there. >> reporter: ted cruz' old enemy now pulling out the political pitch forks. former house speaker john boehner. lucifier in the flesh. i never worked with a more miserable son of a bitch. >> reporter: boehner commenting c ing candidly in california. >> over my dead body. >> he allowed his inner trump to come out. >> reporter: cruz today in indiana. >> john boehner in his remarks described donald trump as his texting and golfing buddy. truth of the matter is, i don't know the man. i've met john boehner two or three times in my life. >> reporter: to stop trump, cruz needs help from more members of the gop including the d.c. establishment he's been fighting for years. during the 2013 shut down famously huddling with members of congress to turn them against leaders like boehner. cruz considered by someone of the most hated man on capitol hill. now trump is trying to prove he's the one that can work with washington picking up new congressional endorsements today and sending top staff to argue senator cruz has no shot. >> last tuesday was the nail in the coffin. indiana is when he realizes. >> reporter: cruz and fiorina. cruz campaign sources tell nbc news, fiorina was would be of five finalists for the v.p. spot. >> she's a nice woman, but it won't help. >> reporter: they have to prove they can stop trump here but for the front runner, a shutout won't help. less pressure in the high stake state. >> if we win in indiana, it's over. >> is indiana a must-win for you and the senator? >> indiana is very important, and i think we're going to do really well. >> it will be a fight. a cruise campaign aide telling me they don't expect to shutout trump. cruise himself at the rally that wrapped up hyping indiana's battle ground status arguing what happens here could keep the country from, in his words, plunging over the cliff. lester. >> halle, thank you. let's turn to the streak of brutal weather striking across the south and state of emergency in biloxi, mississippi. the water rapidly rises trapping people with no way out and as nbc's miguel almaguer tells us, a new threat is brewing. >> reporter: it hit ma l biloxi, mississippi like a wall of water. the city bracing for tornados was pounded with steady rain, ten inches of water in some spots. the deluge triggering evacuations and rescues, men, women, children pulled to safety. nearly 200 emergency calls came in. >> within the past ten minute, i've seen it rise at least four feet. >> reporter: rescues continued all day using military equipment. a highway submerged under 2.5 feet of water. >> it's never flooded like this. >> reporter: water poured into homes. neighborhoods turned into islands. >> devastation. it's a total loss. >> reporter: it wasn't just the rain, there was wind, too. >> there's got to be 65 or 70 mile an hour winds. >> reporter: it comes after a deadly week of weather across the country from california -- >> that is wild. >> reporter: -- to missouri and iowa. >> tornado on the ground right there, guys. >> reporter: at least 22 tornados in seven states. >> everything from 18 inches down is a total loss. >> reporter: tonight back in mississippi, the water is reseeding but the damage is just being tallied. the rain stopped but water is rising in local rivers and creeks. we're not far from the biloxi river. lester, it's expected to peak and crest. >> looks like it's running pretty quickly. miguel, thank you. with final exams just around the corner, a number of american college campuses including harvard are being hit with the mumps. it's a highly conta contagious decide forcing some students into quarantine too stop the spread. we get details from nbc's kate snow. >> reporter: from her third floor room, freshman elaina is in isolation with the mumps sending us this video. >> i got quarantined on monday after i went to harvard university health services and basically showed symptoms like face swelling and cold. >> reporter: with more than 40 students sick so far, fears it could affect finals, even graduation. >> we've been scared or self-s. >> reporter: other college outbreaks in indiana, illinois, connecticut. why so many? college campuses are unique. >> colleges are a place where people have extended, prolonged face-to-face contact. in class, in dormitories. >> reporter: even though most college students have to prove they had shots as kids, the protection against mumps can ware off. mumps is contagious with the common cold but with swollen painful sal vary glands, fever and fatigue. there is no treatment but most recover in a few weeks. >> i was quarantined for a week. >> reporter: tyler gray was vaccinated when he was young, but still got sick. >> i didn't think anyone still got the mumps. of course, i was calling my parents, and they were freaking out. >> reporter: health officials say there are no plans to give booster shots to students. they are hoping kids leaving campus for the summer will mean the end of the outbreak. kate snow, nbc news, new york. now to a troubles twist in the nationwide epidemic of distracted driving. the phone app snapchat is being sued for contributing to a horrific crash. a teenager accused of slamming into an uber driver while using a snapchat feature that clocks your speed while taking a selfie. here is nbc's tom costello. >> reporter: it was supposed to be a self-knee snapchat of life in the fast line, 107 miles per hour to be exact but end in a high-speed crash with twisted metal, serious injuries and this law site against 18-year-old crystal mcgee, the alleged driver and snapchat it self-. it app happened in atlanta. mcgee was driving at 80, 90 and 107 using a snapchat filter that calculates speed. at 107 she crashed into another driver who suffered serious brain injuries. while on the way to the hospital, mcgee allegedly snapped this selfie and wrote, lucky to be alive. the victim's attorney claims mcgee had been pushing the speedometer and watching her app. you record a video or photo on snapchat and add the fit tore calculate how fast you're going. in this case, 39 miles per hour. snapchat warns not to use the app or filter while driving. >> press and add a caption and send. >> reporter: snapchat claims 60% of 13 to 34-year-olds use its app. traffic researchers say distracted driving now accounts for a stunning 70% of traffic accidents. >> we know that if you take your eyes off the road for more than 2.5 seconds, the crash risk increases so if you try to look at the app to figure out how fast you're going, you're not looking at the road. >> repteor tr:onight 18-year-old crystal mcgee is not responding to requests for our comment. snapchat says no snap is more important than somebody's safety. we discourage the community from using the speed filter while driving. u.s. officials now blame the syrian government for a deadly air strike on a pediatric hospital. at least 27 people were killed in the attack in the doctors without borders hospital in aleppo, which the u.s. says was targeted. among the victims, many children and vital medical personnel. we get more from nbc's bill neely. >> reporter: amid the rubble of what was a children's hospital, terrible scenes. the desperate trying to save lives, the distraught knowing their loved ones were lost. dozens died, children, doctors, nurses. that's my family he screams. i lost my family. among the dead, one of the last pediatricians in syria's biggest city. dozens were injured in what the u.s. called deliberate air strikes on a known hospital tied to the aid group doctors without borders. >> we're obviously find this attack reprehensible. >> reporter: missiles targeted the innocent as they slept, a war crime under international law. >> it is impossible that none of the courses fighting in aleppo didn't know that this was, you know, a medical facility. >> reporter: the u.s. and syrians here blame the government. why did we deserve this she asks? other medical centers have been hit this week, as the last traces of a seize fire disappear. it's catastrophic says the u.n. peace talks collapsing. >> how can you have substantial talks when you have only news about bomb being in shelling. >> reporter: a massacre of children and of the doctors who treat them. bill neely, nbc news. there's more to tell you about tonight. still ahead, you are always saying you don't have time to exercise. what if you could cram the benefits of a 45-minute workout into one minute? the fitness strategy that has a lot of allergies. and i'm doing just fine. there are hundreds of different allergens that come from pets, pollen and dust. just one claritin provides 24-hour relief of symptoms that can be triggered by over 200 allergens. yeah, over 200 allergens! with claritin, she's not focused on her allergy symptoms. she's focused on winning. with powerful, 24-hour, non-drowsy claritin, my allergies don't come between me and victory. live claritin clear. fight heartburn fast. with tums chewy delights. the mouthwatering soft chew that goes to work in seconds to conquer heartburn fast. tum tum tum tum. chewy delights. only from tums. incredible bladder prthat lets from always diyou move like you mean it now comes with an incredible promise. the always discreet double your money back guarantee. always discreet is for bladder leaks and it's drier than poise. try it. we're so confident you'll love it, we'll give you double your money back if you don't. incredible bladder protection. double your money back guarantee. that's always discreet. so you don't have to stop., tylenol® 8hr arthritis pain has two layers of pain relief. the first is fast. the second lasts all day. we give you your day back. what you do with it is up to you. tylenol®. unless you have allergies. flonase is the first and only nasal spray approved to relieve both itchy, watery eyes and congestion. no other nasal allergy spray can say that. go ahead, embrace those beautiful moments. flonase changes everything. we're back now with the headline about exercise that has a lot of people talking today. new evidence at the so-called one-minute workout really does work. that doesn't mean you're over and done with the workout in a minute, but it does mean that shaking up your routine could mean you get in shape in a lot less time. morgan rat ford and plains. >> reporter: exercise. we all know we should make it a priority and yet, it's the first thing to drop out of a busy schedule. trainer andrew hears it all the time. >> they have kids, they have a busy job. the main thing comes down to time. >> reporter: researchers in canada wanted to see if there was a way to get more of the of the workout in less time. >> if you have ten, 15 minutes in the day, you can get in a quality workout that's going to either maintain your fitness or improve your health and fitness. >> give me everything you got. >> reporter: they found one minute of super intense exercise in a short routine can have benefits. >> if you're willing or able to go very hard, you can get away, if you will, with a surprisingly small dose of exercise. >> reporter: the study compared men who exercised for 45 minutes at moderate intensity with those who did high intensity interval training for ten minutes. after a warmup the high intensity sprinted for 20 seconds and road slowly for two minutes to recover. they did that three times through. the high intensity group put in a total of 30 minutes a week. the moderate intensity group 150 minutes and both saw equal cardio health benefits. >> it sounds easier than it is. sprinting for 20 seconds at high intensity means going all out, as hard and as fast as you can. you're saying this isn't a quick fix for a couch potato? >> absolutely not. the body responds to progression. you can't pound it and expect to see results. >> reporter: the good news, you might get those results in less time than you think. we're back in a moment with news about the ice cream man who created the sound track to summer in so many american neighborhoods. ♪ ♪ some cash back cards are, shall we say, unnecessarily complex. limiting where you can earn bonus cash back... then those places change every few months... please. it's time you got the quicksilver card from capital one. quicksilver earns you unlimited 1.5% cash back on every purchase, everywhere. doesn't get much simpler than that. what's in your wallet? her long day as anne. hair stylist starts with shoulder pain when... hey joanne, want to trade the all day relief of 2 aleve with 6 tylenol? give up my 2 aleve for 6 tylenol? no thanks. for me... it's aleve. i thought i neededuggled cigarettes to cope. i was able to quit smoking. and then i started running. now, i feel a lot better. 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(children giggle) symbicort. breathe better starting within 5 minutes. call or go online to learn more about a free trial offer. if you can't afford your medication, astrazeneca may be able to help. finally tonight, kids learning to chase their dreams at a full gallup. they live in a city where 25% live below poverty but they are getting a chance to become cowboys and cowgirls with most canyons are made of concrete. >> reporter: in a battered philadelphia neighborhood, it's the last thing you'd expect to see. inner city kids riding high. >> when i'm on the horse, i don't think about what's going on out here, but when i'm off, you hear everything. like the gunshots, the news, people dying every day. >> reporter: he first saddled up when he was 10. >> they called me the concrete cowboy and i laugh. >> reporter: the sight of the unlikely cowboy brings smiles to the whole neighborhood. it's all thanks to malik divers, with donations, he built a makeshift stable where he's able to teach boys to ride for free. in exchange, they have to work. >> once they start learning, they start staying out of trouble, give them something to do and keep them busy. >> reporter: on these streets, malik says, trouble is hard to avoid. one of his young riders dominique was shot and killed last year. >> it's a lot of senseless killing, and you know, these kids, they need things to do. places to go. things that will make them happy. >> reporter: do you think riding changed you? >> yeah. i think i was 16 turning 17 when i stopped riding, and my temper flared. like, i got angry so fast all the time but now, i just go for a little ride, i don't have to worry about nothing. >> reporter: it's a m momentarily break, pushing city life to the background only for a few hours a day. a young man sitting tall in the saddle. rehema ellis, nbc news, philadelphia. >> what a great sight. that's going to do it for us on a thursday night. i'm lester holt. for all of us at nbc news, thank you for watching and good night. here is a live look at lincoln financial field. fans attending the draft party will see the team change the course of their history. this is evils draft day. it's a franchise draft for the eagles. >> we decided moving to the second pick was the right move for the franchise. >> you get this much of the future, they have to be right. >> the birds will draft the quarterback of the future tonight. but their quarterback of the present isn't happy. >> i'm derek gunn of comcast sports net. we'll hear from doug peterson on his first draft as the head coach and plans for sam bradford, coming up. >> carson wentz and jared goff are out here. they are the one and two quarterbacks that will be taken. looks like the birds will get wentz. we'll hear from them both on this draft day special. >> i'm asking the fans what they feel of the eagles move up to the two spot and what they think of sam bradford's request to be traded out. >> all that and a

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