Now. From nbc nbc nightly news World Headquarters in new york this is nbc nightly news. Reporting tonight lester holt. Good evening. It wasnt an accident it was deliberate. The jawdropping announcement that the copilot of that Germanwings Airbus purposely flew the plane along with 149 innocent people into a french mountainside has touched off a string of questions starting with why on earth. It may have been the last thing investigators expected to hear on the cockpit voice recorder the sound of the captain who had briefly left the cockpit pounding on the door as the plane rapidedly descending to the ground. And the screams of passengers as they realize their fate. What was the motive who was the copilot and how did he do it . And how was this allowed to happen . Were covering it all. Lets begin with bill neely in southern france. Bill we are all left sick over this. Reporter yes, indeed. Good evening, lester. This was one of the most stunning announcements in aviation history. What we still dont know is why the copilot did it how he did it is now clear. In total silence he deliberately programmed not just his own death but the deaths of his colleagues and of his trusting passengers. The harrowing search for the remains of the dead intensified today at the scene of what was believed to be a tragic accident. Not anymore. This is the site of a mass murder. The french prosecutor blaming this man, the 27yearold german copilot andreas lubitz. His intention was to destroy this plane, he insisted. He deliberately made it lose altitude. His evidence is from the planes cockpit from the battered voice recorder found in the wreckage that allowed investigators to hear the cockpit sounds. The plane flying from barcelona had reached its cruising altitude when the pilot is heard leaving the cockpit. He tried to get back in first knocking then banging the door. Locked by the copilot who ignored him. He just set the all the pilot to descend to its lowest possible setting, 100 feet. For the next eight minutes he breathed normally and said nothing as the plane plummeted, ignoring alarms and failing to answer desperate calls from controllers and from the cabin where people began screaming moments before he smashed the plane into the mountain. The families of the dead were told the news before they began what was always going to be the hardest journey to the mountains near the crash site. They were told the passengers were una i ware of what the copilot was doing until the last minute. And that they died instantly. This is as close to the crash site as the families will come. They have no bodies to grieve over. What they do have is the terrible knowledge that their loved ones were killed in these mountains deliberately. Facing the mountains they stood next to their national flags, the stars and stripes among them. The third american victim was named today as Robert Oliver who lived and worked in spain for a fashion company. The remains of the dead are slowly being removed. Searchers still looking for the second cockpit data recorder and more clues to a chilling crime committed by a calculating young pilot. Bill neely, nbc news, seyneslesalps, france. Reporter this is katy tur in germany. Andreas lubitz was 27 a german who spoke fluent english, grew up in a picturesque town and friends say had dreams of flying. He began training with lufthansa in 2008 including time at this facility in phoenix. He was certifi in 2013 but accumulated only 630 flight hours until Officials Say he deliberately crashed flight 9525 into the side of a mountain killing everyone onboard. No one saw it coming. He had no criminal record no known terrorist connection. He passed all tests because nobody gets into the cockpit without passing the tests. Reporter lufthansa says lubitz took a break from Flight School in 2009. It hasnt said why. But the ceo of their subsidiary germanwings told nbc news he was readmitted a few months later after passing technical, medical and psychological tests. Today, investigators searched his parents home in montabaur and escorting out an unidentified person. Boxes of potential evidence were taken from lubitzs dusseldorf apartment. Those who knew him were stunned. Knowing andreas, he said this is inconceivable to me. Lufthansa stood by its training and testing procedures. So youre confident in your pilots . I wish you understood my german because i said twice and repeat it in english without any doubt my Firm Confidence in the selection of all pilots in the training of all pilots and the qualification of all pilots and the work of all pilots has not been touched by this single tragedy. Reporter i confirmed this with the germanwings ceo. They do not retest for psychological stability. Every six months they retest for medical and retest for technical. They only retest for psychological stability when a pilot is first hired at the company, lester instead relying on selfreporting thereafter. Katy tur, thank you. And sadly in this incident some of the very Safety Measures designed to keep us safe in the air after 9 11 may have done just the opposite sealing the fate of everyone on board. Tom costello explains. Reporter the airbus promotional video shows its reinforced cockpit is nearly impenetrable with a code pad for crew members to open the door from the outside. But whoever is inside the cockpit can override the code and keep everyone else out. A post9 11 security measure that may have been used against a captain and his passengers. We created barriers to prevent bad guys from getting into the cockpit, and unfortunately now this type of event shows that the bad guys already in the cockpit and we cant get to him or her to stop them. Reporter in the u. S. The faa requires at least two people to remain on the flight deck at all times. If a pilot leaves to use a lavatory a Flight Attendant normally remains in the cockpit. If the flying pilot then has a medical problem or anything like that you have somebody else in the flight deck that can assist them but can also get the door open for the other pilot to return. Reporter until today most other nations and airlines including lufthansa did not have the twoperson rule. But late this afternoon lufthansa joined a growing number of airlines that said theyre now adopting the rule immediately, including airberlin, norwegian air, easy jet, air transat and air canada. The ntsb concluded suicidal pilots crashed egypt air flight 990 and silk air 185 killing everyone onboard. And its among the leading theories in the disappearance of Malaysia Flight 370 last year. But noticing a pilot has a psychological issue can be difficult. Once hired their yearly physicals rarely include a psychological workout. A lot of pilots are afraid to actually admit that they have a psychological problem because they know that the faa will deal with that and that they may be grounded for periods of time. Reporter the nations Airline Pilots insisted they are evaluated every day on the job by their managers and fellow pilots. And they look out for each other because nobody wants to fly with someone whos not stable lester. Tom costello tom, thank you. Breaking news late today here in new york city. A building suddenly exploded sending off an inferno and causing it to collapse. There are critical injuries and hundreds of firefighters on the scene tonight. Nbcs rehema ellis is in manhattans east village with more. Rehema. Reporter good evening, lester. Firefighters say at least 12 people were hurt three of them critically injured. The mayor says it doesnt appear that anyone is injured or i should say that anyone is missing. But the scene is still very active. A frightening scene in manhattans east village. Firefighters were called to a twoalarm fire late this afternoon, but the situation quickly escalated. That twoalarm fire turned into a sevenalarm. We thought it was a bomb something and then my manager actually ran into the restaurant. I saw the whole store front just on the street. Reporter more than 250 firefighters from at least 50 fdny units were on scene trying to control the inferno, but it was too late. The fivestory building was quickly engulfed in flames. And less than an hour after it began the building housing more than two dozen residential units and a restaurant collapsed. There was a pretty loud sound, obviously. Walked outside and just see no building being there at all. Reporter flames spread to neighboring structures. Thick plumes of smoke could be seen from blocks away. First responders helped the injured. Many of them trying to get away from the area. Surrounding streets were closed because of concerns over flying debris. Fdny as usual is doing extraordinary job handling this very very difficult situation. Reporter gas in the neighborhood was turned off, and numerous buildings evacuated. Officials say this could be an active situation until tomorrow as crews continue trying to contain the fire in surrounding buildings. We will be here for a very long night. Reporter the gas company says it went to the building earlier today to review new construction that did not pass inspection. The company says an hour after the gas workers left the building exploded. This investigation is ongoing. Lester. Rehema ellis on that breaking news in new york tonight. Thank you. Oklahoma is under a state of emergency tonight after a deadly outbreak of tornadoes ripped through the state. The destruction a painful reminder of the alltoo recent past for the city of moore. Heres nbcs gabe gutierrez. There it is. Tornado on the ground oh dear lord. Reporter moments of panic in oklahoma as fast moving storms sliced through the state. Dawn revealed the destruction, dozens of homes west of tulsa leveled, cars flipped on i35 one person killed. In san springs this donut shop shredded. Its hard. It is. Reporter a dramatic rescue at a kids gym after the roof collapsed with dozens of young girls inside. You feel like your body almost lifting up and you can hear like the front or two moving back and forth. Reporter firefighters swooped in carrying the girls to safety. Amazingly they all escaped with no injuries. Every one of them were cold scared crying no shoes. Reporter he credits gymnastic teacher Jennifer Patterson with saving lives by rushing kids to a shelter just ten minutes before the roof was ripped off. Its a miracle. It is a miracle. God was watching over every single one of the kids. Reporter further south in moore another tornado tore this roof off an Elementary School where two years ago a massive ef5 tornado killed 24 people and injured more than 300. Moore has been the bullseye for three major tornadoes since 1999. A reason for this being a favored tornado location is the moisture coming in from the south and east. It clashes with desert air from the swet. Reporter tonight, thousands of people here are without power, but not without gratitude. They walked out of there with our babies untouched. Untouched. Reporter as tornado season is now underway. It will be another long night for residents here. More than 30 homes are destroyed in this neighborhood alone. There is debris in every direction here. And just to our south National Weather service Just Announced that the city of moore was hit with an ef1 tornado with winds up to 110 miles per hour. Lester. All right, gabe gutierrez, thank you. To the middle east now where the chaos in yemen has suddenly expanded into a dangerous regional war with iran on one side saudi arabia on the other. And as you might imagine, syrias implications all around for the u. S. Our chief Foreign CorrespondentRichard Engel has more. Reporter saudi arabia has long been known for getting washington to fight its battles. Not this time. These saudi fighter jets are on their way to attack rebel positions in yemen, targeting weapons deposts, a command center and aircraft used by the rebels whove been trying to overthrow the government. The rebels called houthis now control large parts of yemen. Theyre backed by iran. To fight them saudi arabia says its bombing with 100 jets imposing a nofly zone and mobilizing 150,000 ground troops. No invasion yet, but thats clearly an option. The Saudi Coalition of ten muslim nations includes jordan and egypt, which today reportedly sent warships to defend the yemeni coast and offered to send ground forces. Thousands of yemenis protested the saudi air strikes. So did iranian officials in switzerland today from nuclear talks. We believe that the situation in yemen is a very dangerous situation. Reporter the war in yemen has now become a battle between iran and saudi arabia two old and wellarmed rivals. And neither side appears willing to back down. Washington is assisting saudi arabia with intelligence but this time its letting the muslim world fight its own wars. There is however a major risk of an escalation if theres a ground war or Oil Prices Spike or saudi arabia itself is in danger the u. S. Might not be able to just sit back and watch. Richard engel, nbc news istanbul. In illinois a National Guardsman and his cousin are accused of conspireing to support isis. The fbi arrested specialist Hassan Edwards as he tried to board a plane, first leg of a trip to egypt and alleged attempt to join isis. The fbi also arrested jonas ed monds for allegedly asking an undercover agent to help carry out a terror attack on a u. S. Military facility using his cousins uniform. A dramatic day at the marathon bombing trial in boston. How the bombs were made what set them off and the big mystery that still remains. And later, some good news on a night we could really use some. Making a difference with mouth waterin congratulations. Youre down with crestor. Yes when diet and exercise arent enough, adding crestor lowers bad cholesterol up to 55 . Crestor is not for people with Liver Disease or women who are nursing, pregnant, or may become pregnant. Tell your doctor all medicines you take. Call your doctor if you have muscle pain or weakness, feel unusually tired have loss of appetite, upper belly pain, dark urine or yellowing of skin or eyes. These could be signs of serious side effects. Im down with crestor make your move. Ask your doctor about crestor. 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Each of them using their own Remote Controls which the fbi said today were not interchangeable. And investigators revealed today that each bomb made in a Pressure Cooker like this had a backup an ordinary fuse sticking out that the bomber could light then run away if the Remote Control didnt work. But its still a mystery where the bombs were made. The fbi says only minute traces of explosives were found in the apartment where tamerlan lived with his wife and daughter and in his car. On monday defense lawyers will begin presenting their case once the prosecution rests. The jury could begin deliberating late next week in this first phase of the trial. Pete williams nbc news boston. We are back in a moment with a heartwarming surprise the amazing final wish by one of the greatest i have the worst cold with this runny nose. I better take something. Dayquill cold and flu doesnt treat your runny nose. Seriously . 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