Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. Did police in the nashville area prevent another horrific Movie Theater attack . What we know right now is that a 51yearold man inside a theater and reported to be armed with a gun, a hatchet, and pepper spray was shot to death this afternoon in an exchange of gunfire with police. One person received a minor wound, but no one else was killed as Police Responded quickly to reports of an active shooter. The entire incident a frightening echo of what happened only two weeks ago in lafayette, louisiana and of course three years ago in colorado. Mark potter is in antioch, tennessee with the latest. Reporter Nashville Police say it was just before 1 15 local time that reports came in of a man carrying a gun and a hatchet at the Hickory Hollow cinemas. Countywide dispatch to all cars, we have shots fired, an officer involved. 901 bell road. Thats going to be 901 bell road. The hickory 8 Movie Theater. Shots being fired right now at the Movie Theater. Reporter it was inside the theater during a showing of the film mad max fury road where a lone officer first saw the gunman. He saw a gun come up. He saw a trigger about to be pulled. He disingagged. They are still processing the crime scene back there. Reporter police say the gunman fled out the back door where the s. W. A. T. Team confronted and killed him. From the air the suspects body could be seen lying on the sidewalk. Witnesses tell police the suspect had pepper spray and use it on at least three moviegoers and hit one of them, a 58yearold man, on the shoulder, perhaps with the hatchet. But no one was seriously injured. Were working very hard to exactly c confirm the identity but we believe the suspect is 29 years old. He is a male white from this area. He had two backpacks on him. The one that remained on his person may have a hoax device. A device to look like it. Reporter three people were killed including the gunman and as a jury decides the fate of james holmes, convicted in the kilning of 12 people in a theater in 2012. Social media lit up today with messages of shock and concern. Police say they have been training for this type of incident and praised the officers for responding so quickly keep thing contained to one of eight theaters here, perhaps preventing any loss of life among the movie goers. Mark potter, thank you. The news family members feared expected. Confirmation that flight hm 370 was in fact lost at sea. That piece of wing found washed up on a Remote Island beach conclusively part of the plane that disappeared without a trace last year with 239 people aboard. Bill neely reports from france where the part was brought for examination. Reporter reporter they came to help solve the mystery, and in just three hours these experts concluded the debris found on reunion island is from malaysian flight 370. It is with a very heavy heart reporter malaysias Prime Minister saying they confirmed conclusively it was from the missing plane. Its indeed from mh370. Reporter french prosecutors wouldnt say exactly how they decided that and didnt call it conclusive proof. The experts were looking for paint or part numbers, anything to link the debris to the plane. You can look at any part, look at the serial number and identify what airplane it was originally installed on. Reporter the debris came from the planes wing, a moving flap theyll now analyze to calculate the speed of the aircraft on impact and how it broke up. The news comes after a long wait. For families in china, where half the passengers were from, their last hope is gone. Sarah bajc, the girlfriend of the only american on board, said now families finally have a chance to grieve, though this doesnt solve the mystery or hold anyone accountable. That mystery remains and the search continues off australia from where strong currents may push more debris west toward reunion and other islands. There the search for Aircraft Parts will now intensify along thousands of miles of coast. And the experts will be back at this french lab tomorrow to analyze that wing flap again to try to work out how and why that plane crashed. But the answer to that is almost certainly not here but on those two flight recorders at the bottom of the indian ocean. Lester . Bill neely in france tonight. Thank you. The battle over the Iran Nuclear Deal grew even more intense today as president obama gave a sweeping speech with fiery words for critics. There is one thing both sides do agree on, though. The upcoming congressional vote on the deal will be the most important Foreign Policy vote since the iraq war. Our senior White House CorrespondentChris Jansing has details. Reporter president obama on the attack, answering critics of the Iran Nuclear Deal with an impassioned, nearly hourlong defense. Congressional register of this deal leaves any u. S. Administration that is absolutely committed to preventing iran from getting a Nuclear Weapon with one option another war in the middle east. Reporter its an argument critics say is a false choice. Never, ever has there been any discussion about if this deal falls apart there would be military action. Never. Reporter speaking at american university, where jfk famously made the case for Nuclear Diplomacy we do not want a war. Reporter mr. Obama took sharp aim at his critics, saying theyre the same people who argued for war in iraq. A mindset that exaggerated threats beyond what the intelligence supported. Reporter and he compared them to iranian hardliners. Its those hardliners chanting death to america who are most opposed to the deal. Theyve been making cause with the republican caucus. Reporter that accusation only inflamed entrenched opponents. Backing those opponents, proisrael groups, spending big. A 25 million tv ad blitz is under way. Congress should reject a bad deal. Reporter a new pnnbc news poll shows the public evenly divided over the nuclear deal, but opposition has doubled just since june. And with Congress Facing constituents during the august recess the president asked voters for help. Remind them of who we are. Remind them of what is best in us and what we stand for. Reporter adding to the escalating debate, reports tonight that satellite images show iran cleaning up nuclear sites, destroying evidence. Opponents say its proof iran isnt to be trusted. The president has said the inspectors can detect past Nuclear Activity anyway. Lester . Chris jansing at the white house, thanks. As we speak, parts of california are in flames. Nearly two dozen wildfires burning across the state. The biggest one weve been telling you about the last two nights, the rocky fire. Its burned more than 100 square miles. But an all too brief break from the hot weather has given them an opening and theyve been using it to their advantage. Joe fryer explains. Reporter firefighters are finally playing offense against the rocky fire with the flames slowed down by a welcome stretch of cooler weather. Still theres no rest. Firefighters are busy mopping up hot spots. If the winds pick up they want to make sure the embers dont spark new fires. Were not taking anything for granted. Were always prepared for the worst. And were definitely not out of the woods yet. Reporter the fire is now a week old. Described by some as a demon, it has behaved erratically, moving at record speeds and scorching more than 100 square miles. Filmmaker jeff frost witnessed the fires fury over the weekend, capturing time lapse video. It was like waves of fire just going over everything, covering entire hillsides in seconds. Reporter intense heat and moisture combined with strong air currents have generated pyrocumulus or socalled fire clouds. Reaching 30,000 feet these monster masses can grow into thunderstorms creating dangerous lightning strikes. When the cloud collapses it also throws a rush of hot air to the ground shooting fire and embers out for miles. Its like a strong smoke column coming out of your chimney full of embers and particles from the burning ash. Reporter the commander overseeing this fight fears more intense fires over the horizon. Were really worried because of the drought and the conditions were seeing in august whats it going to be like in october . Reporter across california nearly two dozen wildfires are burning. One sparked by a barrage of lightning strikes. Firefighter jeff bruzatore watched his home burn down but kept battling for his neighborhood. Im a firefighter. Weve got to save the community and do what we can. Reporter the rocky fire has burned 68,000 acres, destroying 39 homes. The weather is getting hotter and dryer again, which is a concern. But if firefighters can keep the flames within the lines theyve been digging around the fire the hope is to have it fully under control by monday. Lester . Joe fryer, thank you. Amid the outrage over the killing of cecil the lion vandals have struck the florida home of walter palmer, the american dentist who took cecils life in zimbabwe. Palmer has stayed out of sight since the story exploded last week. Meanwhile, palmers hunting guide and another man who assisted him both appeared in court today on poaching charges. The guide calls the charges against him frivolous and says palmer did nothing wrong. Let the countdown begin. Exactly one year from tonight the greatest athletes in the world will gather at the Opening Ceremony for the rio olympics. But theres a lot of work left to be done in that city between now and then. So the burning question is will rio be ready . Nbcs Miguel Almaguer is there for us tonight. Miguel, good evening. Reporter lester, good evening. Here on copacabana beach events like Beach Volleyball and the triathlon will be held. Hosting the games is a Monumental Task but every governing body here says rio will be ready. The sights, the sounds of rio. The time is almost here. Some of the 11,000 athletes have arrived. The americans are on the water and in the water. Triathlete Gwen Jorgenson among the first competitors to qualify for the games. Im just getting really excited thinking about what next years going to be like. Its just been a great welcome here. Reporter in all 206 nations will compete in the sunbathed city of rio where brazils largest security operation ever will take place. 85,000 involved. Subways tunneled. New roads are being built. The enduring legacy with regard to infrastructure will be a new Public Transportation system. Reporter the backdrop beautiful on the sands of copacabana Beach Volleyball. In the shadow of sugarloaf, sailing. The roads into olympic park are absolutely stunning. Youll drive right along the coastline. And thats when you first see it. Reporter venues like basketball, gymnastics and the swimming stadium slowly taking shape. Its coming together piece by piece. Some venues are being built from the inside out. Now theyre moving at a faster pace. The crews that work here and city leaders all pledge rio will be ready. Even with the games just a year away. But there has been criticism in a region where Water Pollution is a problem and favelas, or slums line hilltops all over the city, crime is a major problem. 12 billion spent on the games in a country where the poverty rate is over 20 . We have lots of inequality. We have lots of problems in infrastructure. So rios not going to be a perfect city after the games but its going to be a much better city than when we got the games. Now the sprint to the finish. In this religious country they say god will be watching. But with one year to go, so is the rest of the world. While city leaders concede not every environmental cleanup project was complete, specifically the water, they point to other successes. After some of the venues close, theyll be turned into schools. But there is plenty of work to be done but the cauldron is lit. Lester . Miguel almaguer in rio tonight. Divorced catholics who remarry should be treated better by the church according to pope francis. Remarriage without a divorce ending in annulment is considered a sin by the catholic church. And while the pope is not calling for a ban on communion being lifted for such catholics, the pope says they should not be treated like theyre excommunicated. A lot more to share with you tonight. Still ahead after the big announcement from netflix thats got a lot of people talking, unlimited maternity and paternity leave with pay, we look at what other big perks companies are offering these days. What is your employer doing to keep you happy . Also a great making a difference report thats going to make you smile. One young chef says thank you one delicious recipe at a time. Take all the time you need. That was the message from netflix to its employees that got so many people talking. As we first told you about last night, the company is offering unlimited paternity and Maternity Leave for new parents with pay. Its a big move to attract employees and to keep them happy and part of a benefit strategy being adopted by more and more companies. As our National Correspondent kate snow reports. Reporter weve heard about the free meals and the open workspaces. Lots of Tech Companies offer perks to keep their employees happy. But netflix seems ton taking that further than anyone. With an unlimited leave policy to new moms and dads that allows them to take off as much time as they want during the first year of a childs birth or adoption. In the battle for tough talent, time off with a new baby is a winner. We have so much work to do and we love our jobs, were really passionate about them. You want to be at a place that allows you the time and the ability to have a family. Reporter at headquarters for the crowdfunding website kickstarter there are pets roaming around, a beautiful rooftop workspace. Renee park joined a year ago to work in hr. In the past we separated professional from personal life. And in the startup world and just more so in this generation were trying to understand that really its all one thing. Reporter at kickstarter new parents male or female can take up to four months paid leave. Same thing at facebook. Thats way more than the National Average of six to eight weeks. But when Companies Offer generous, even unlimited time off, studies find people dont take it. You start to wonder should i really take the whole time. How much should i take . Will my colleagues think less of me if i start to take the whole time . Reporter at kickstarter they used to have an openended vacation policy but as soon as they limit td to five weeks a year more employees signed up. It was clear we could say we want you to go out of the office. Heres the right amount of days to spend time away from work. 25 days. 25 days. Five weeks a year. Five weeks a year. Thats a lot. Looking to join kickstarter . Reporter the tech world innovating in more ways than one. Kate snow, nbc news, brooklyn, new york. Up next, the new rules today. Why youre about to learn something about your boss you probably didnt know. Also a big surprise at jury duty today that had people pulling out the cameras. If youve ever wondered how much more the head of your Company Makes than you, then this new rule is for you. Federal regulators today approved a measure to force most Public Companies to disclose their pay gaps. Beginning in 2017, they will have to reveal the ratio of their ceo salaries compared to their median employee salaries. So you get the notice in the mail, you show up at jury duty, and you probably dont expect to meet the former leader of the free world there. Thats exactly what happened today, though, in dallas. People pulling out their phones to take pictures with former president george w. Bush, showing up to fulfill his civic duty just like everyone else. The former president did not get picked to sit on a jury. And a stunning new moving image captured by nasa, a view impossible to see from earth. The moon crossing the face of our home plan planet from a million miles away. It was taken by nasas deep space climate observatory at its position between the earth and the sun. And yes, thats the far side of the moon, the side that always faces away from us here on earth. Remarkable view. When we come back, the boy who got one wish for anything he wanted and he chose to use it for others instead. Trouble for barts new smartphone security app. Take why crics think itg racial profiling. Raj take vo plus how san jose plans to permanently honor police, who and protect. ir lives to serve next. T close the news is jess vo youre looking at a new app thas supposeto keep finally, imagine someone gave you any wish for anything you wanted. One shot to realize your fondest dream. Well, exactly the choice granted to a 12yearold boy from minnesota. But he didnt use his wish on himself. Nbcs Kevin Tibbles has tonights making a difference. The big day is here. Oh, my god. That is good. Reporter and aspiring chef lucas hobbs slathers on the special ingredients, preparing his very own thank you feast. Any dad calls me a foodie. Reporter a foodie. Foodie. Reporter not bad for a 12yearold who earlier this year toughed out the chemo while battling stage 3 hodgkins lymphoma. I just did not want to eat at all. It just wasnt fun. Reporter so when the make a Wish Foundation asked lucas for a special request the tastebuds came to mind. Not his. Everyone elses. Perfect. Reporter his wish, commandeer a fleet of food trucks and feed as many doctors, patients, and staff at the minneapolis Childrens Hospital as he could. Hes already been to the local church and police department. Im here to give back the kindness everybody gave me when i was sake. What do you call this . Rockin remission. Reporter rockin remission. You made that name up . Yes. Reporter he even named a hot dog after his oncologist dr. Joanna perkins. Yeah, in a very unique and special way hes saying thank you. His wish is to make people happy. I think this is so generous, such a smart idea. Reporter for those who cant make it down a special delivery for all who can partake. Grilled cheese. Yeah. Reporter something tells me lucas found the perfect recipe for a smile. Its yummy. Reporter Kevin Tibbles, nbc news, minneapolis. That will do it for us on this wednesday night. Im lester holt. For all of us at nbc news, thank you for watching and good night. Thats supposed to keep bart riders safe. But tonight some are soundinghe alarm ying check it out. Nmore ha than g thats the new app to keep b. A. R. T. Riders safe. Some are sounding the alarm saying it may be doing more harm than good. Thanks for joining us. Im jessica aguirre. Im raj mathai. The app is leading to problems. New at 6 00, it was supposed to give b. A. R. T. Riders a discreet way to an investigation into the app seems to show riders are mostly using it to complain and actually targeting certain people. Mark matthews is at the embarcadero station in San Francisco with the details. Mark . Reporter raj, what the east bay express found when they looked at this app from b. A. R. T. Called app watch is that, while ridership on b. A. R. T. Is roughly 10 africanamerican, the africanamerican riders are subject or are the subject of about 70 of the complaints that identify race. The app gives b. A. R. T. Riders the ability to report a host of things with the touch of a button. We want our riders to use this to report suspicious activity, crimes in progress, things like that. Reporter when the east bay express filed a freedom of information request to get one months worth of b. A. R. T. Watch alerts, what the reporter found was the overwhelming majority of alerts were complaints about africanamericans and the homeless. Thats our riders. We cant control what they