Commencement at risk. A major health alert. What is spreading on college campuses. Snap decision, a horrific accident being blamed on a new kind of distracted driving. Its not texting. What every parent should know. The oneminute workout. Evidence it works, getting in shape in 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 costumedressed 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. 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 dont want to hurt anyone, i dont 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 wouldnt 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 taken to the hospital for treatment of gunshot wounds. Its 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 vans 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. Nbcs 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 too farooks his brother, wife and the center of a sham 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 didnt 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 terrorrelated offenses. They felt remorse after the shooting. They have no control of what their brother did. Reporter so far no attacks carried by see syed farook and his wife. Lets 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 didnt 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 con g 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 dont know the man. Ive met john boehner my life. Reporter to stop trump, cruz needs help from more members of the gop including the d. C. Establishment hes 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 hes 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. Shes a nice woman, but it wont help. Reporter they have to prove they can stop trump here but for the front runner, a high stake state. Indiana, its over. Is indiana a mustwin for you and the senator . Indiana is very important, and i think really well. It will be a fight. A Cruise Campaign aide telling me they dont expect to shutout trump. Cruise himself at the rally that wrapped up hyping indianas Battle Ground status arguing what happens here could keep the country from, in his words, plunging over the cliff. Lester. Halle, thank you. Lets 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 nbcs Miguel Almaguer tells us, a new threat is brewing. Reporter it hit ma lux biloxi, mississippi like a wall of water. The city bracing for tornados was pounded 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, ive seen it rise at least four feet. Reporter rescues continued all day using military equipment. A highway submerged under 2. 5 feet of water. Its never flooded like this. Reporter water poured into homes. Neighborhoods turned into islands. Devastation. Its a total loss. Reporter it wasnt just the rain, there was wind, too. Theres 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 the water is reseeding but the damage is just being tallied. The rain stopped but water is rising in local rivers and creeks. Were not far from the biloxi river. Lester, its expected to peak and crest. Looks like its 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. Its a highly contain contagious decide forcing some students into quarantine too stop the spread. We get details from nbcs 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 UniversityHealth Services and symptoms like face swelling and cold. Reporter with more than 40 students sick so far, fears it could affect finals, even graduation. Weve been scared or selfs. Reporter other College Outbreaks in indiana, illinois, connecticut. Why so many . College campuses are unique. Colleges are a place where people have extended, prolonged facetoface 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 didnt think anyone still got the mumps. Of course, i was calling my parents, and they were freaking 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 nbcs tom costello. Reporter it was supposed to be a selfknee snapchat of life in the fast line, 107 Miles Per Hour to be exact but end in a highspeed crash with twisted metal, serious injuries and this law site against 18yearold crystal mcgee, the alleged driver and snapchat it self. It appen happened in atlanta. 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 victims 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 youre 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 34yearolds 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 fast youre going, youre not looking at the road. Reporter tonight 18yearold crystal mcgee is not responding to requests for our comment. Snapchat says no snap is more important than somebodys 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 nbcs bill neely. Reporter amid the rubble of what was a childrens hospital, terrible scenes. The desperate trying to save lives, the distraught knowing their loved ones were lost. Dozens died, children, doctors, nurses. Thats my family he screams. I lost my family. Among the dead, one of the last pediatricians 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. Were 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 didnt 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. Its 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. Tonight. Still ahead, you are always saying you dont have time to exercise. 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We all know we should make it a priority and yet, its 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 thats 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 youre 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 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. 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Reporter in a battered philadelphia neighborhood, its the last thing youd expect to see. Inner city kids riding high. When im on the horse, i dont think about whats going on out here, but when im 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 whole neighborhood. Its all thanks to malik divers, with donations, he built a makeshift stable where hes 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. Its 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 dont have to worry about nothing. Reporter its a pushingadity 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. Thats going to do it for us on a thursday night. Im lels ster holt. For all of us at nbc news, thank you for watching and good kelly ripa hitting the gym as we break news on the strahan replacement plan. Now on extra. Kelly ripas top secret cohost list uncovered. Whos set to fill strahans seat as they hunt for his replacement . And could it actually be a woman