Good evening. Were going to begin tonight with an nbc exclusive interview that comes at a critical time for an entire region of the world. Nbcs ann curry made her way to tehran where she has become the First Western journalist to interview the new president of oh iran, hassan rouhani. This is the first time americans get to see and hear him. That includes many in the obama administration. What you are about the to hear is significant because it represents the first reason for any optimism, the first sign of movement from iran on the issue of Nuclear Weapons. Right when the crisis in nearby syria has reached its peak. So we begin tonight with nbcs ann curry in tehran. Reporter brian, good evening. In our interview irans president was clearly trying to send a message ahead of the first speech of the United Nations that there was a different iran, one that wants to make a deal. The world believes that iran could build a bomb very quickly. You have said this period of time for resolving the Nuclear Issue will not be unlimiunlimit. Just how short is this window weeks, months or years . Translator we have never pursued or sought a nuclear bomb. We are not going to do so. We are seeking Peaceful Nuclear technology. Reporter can you say that iran will not build a Nuclear Weapon under any circumstances whatsoever . Translator the answer to this question is quite obvious. We have time and again said that under no circumstances would we seek uh aweapons of mass destruction. Reporter the Supreme Leader made a strong statement recently on diplomatic flexibility. He said, i believe in whats already been called heroic flexibility. Even a wrestler can show flexibility. What does that mean to you, mr. President . What does it allow you in your negotiations on the Nuclear Issue . Translator in its nuclear program, this government enters with full power and has complete authority. I have given the Nuclear Negotiations portfolio to the foreign ministry. The problem wont be from our side. We have sufficient political latitude to solve this problem. Reporter on syria, president rouhani said syria played a major role in crafting the deal. Can you assure the world president assad will give up all of his chemical weapons . Translator we are not the syrian government. We are one of the countries of the region that seeks peace and stability and the elimination of weapons of mass destruction in the region. Reporter do you believe the United States, president obama, looked weak in backing off an air strike on syria . Translator we consider war a weakness. Any government that decides on war we consider a weakness. Any government that decides on peace we look on it with respect for peace. Reporter and president rouhani confirmed he exchanged letters with president obama recently calling them tie i any steps for a future. That begins at the u. N. Where he said he hasnt ruled out a meeting with president obama. Ann curry, thanks. Much more reporting on our website tonight and tomorrow morning on today. For more we want to go to Andrea Mitchell at the state department. This is the new man. The world came to now ahmadinejad before him. What was important about what he just said versus what we have heard from iran before . Reporter this is a very, very big deal. I can tell you at the white house and at the highest levels of the state department they were watching for this all day. They were looking for these signals in this interview. He made it very clear he wants a deal on the Nuclear Weapons. The president said on telemundo yesterday he wants to test his seriousness. That is what they are going to be looking for at the u. N. There is no formal meeting scheduled. They are not planning one. Unlike ahmadinejad, his predecessor, you can understand ethics week when both of them are at the u. N. , same time, same place, they are going to look for an opportunity to see each other, perhaps to have a real conversation. They believe that iran b want this is because of the oh sanctions, because they are crippling the economy, that the time is right but there is a short window to see if iran is serious, whether this man with a clerical background can do the deal. I was told by a Top State Department official they have been working on the back channel for two years and one of the Significant Players is the foreign minister zarif who was the the ambassador and is well known to this administration. Thank you both. We turn from tonights news on Foreign Affairs to the shooting rampage at the Washington Navy yard and the acknowledgment today by the u. S. Secretary of defense there were many red flags that were missed about the past behavior of this gunman, aaron alexis as the gunmans mother today broke her silence. Our justice correspondent Pete Williams is with us from the d. C. Newsroom with the latest on the investigation. Good evening. Reporter brian, good evening. More signs tonight the of the troubled mind of aaron alexis. Investigators say he scratched two phrases in the shotgun he was carrying. Quote, better off this way, and my elf weapon. An abbreviation they cannot explain. Add the secretary of defense to the list of those wondering how a contractor like aaron alexis could get and keep a security clearance allowing entry to the navy yard after three runins with police and recent struggles with psychiatric problems. There were red flags, of course there were. Should we have picked them up, why didnt we, how could we . All those questions need to be answered. Reporter after examining Surveillance Video and interviewing survivor uhs officials give this revised account of what happened inside. Alexis enters building 197 with a shotgun in a bag and went directly to the 4th floor, ducked into a mens room and came out firing. Virtually all of those hit were hit with shotgun blasts. He went back to the entrance, shot a security guard, took his handgun, raced upstairs and continued shooting until killed by police. Investigators say they have no idea why alexis selected that building. They have identified no specific target of his anger. Alexiss mother declining to appear on camera, says she has no answers either. I dont know why he did what he did. I will never be able to ask him why. Aaron is now in a place where he can no longer do harm to anyone. For that i am glad. Reporter as the government looks at how to factor Mental Health issues into bkd investigations there was a note of caution. Men and women should have the opportunity to overcome their mental disorders or their mental challenges or their Clinical Health challenges. And shouldnt be stigmatized. Reporter nbc news got an exclusive look inside the washington Trauma Center where survivors were brought monday. Nbcs Peter Alexander talked to doctors who treated the wounded. Two patients who are here are in good condition, recovering well. We ex expect them to make excellent recoveries. Reporter we know alexis told the Newport Police last month he was hearing voices. Now the v. A. Says when he later sought treatment twice he said only that he was having trouble sleeping. The Newport Police told local nay vi authorities what happened but the navy said that was never reported any further up the chain of command, brian. Pete williams in the d. C. Newsroom on the case tonight. The Economic News today sent the stock market soaring but it wasnt necessarily good news for everybody in the rest of the country. The long and short h of it is this. The American Economy is not doing well enough to be left alone. After first saying the recovery was gaining strength, the head of the federal reserve, ben bernanke today decided to keep going with economic stimulus to try to encourage job and economic growth. Both the dow and s p closed at record highs as a result. Good news for anybody with a 401 k . Mortgage rates are expected to drop but the fed believes the American Economy still need s a continuing infusion of 85 billion a month. There are growing concern that is a potential Government Shutdown in washington will h do more damage. Now across the boarder in canada near ottawa today, a terrible crash between a passenger train and a doubledecker bus. It killed six people at the height of the morning rush. Survivors on the bus said many passengers were screaming at the driver to stop just second s before the bus crashed through a crossing barrier into the train, part of the via system in canada. Its an increasingly desperate situation in and around the resort city of acapulco, mexico, tonight. Hit hard by Tropical Storm manwe ll. The death toll is now listed at at least at 80. Most of the 40,000 tourists are trapped without power, access to cash and no way to get home. Back in this country, in colorado, the historymaking flood waters there have started to recede, revealing the full scope of the devastation beneath. The cleanup now begins. For tens of thousands of families. At the same time remember almost 200 people are still officially listed as missing, including a husband and father who set out in search of his wife as the flood waters came up and sadly never came home. Nbcs kate snow has that story tonight from boulder. Reporter the bowlen siblings have been waiting. Their parents lived in hard hit lion. The speaker came up the canyon saying you need to evacuate immediately. Reporter they left in separate vehicles. When sharon saw flooded roads she pulled over. I thought he was right behind me. Reporter instead jerry headed to a shelter at the Elementary School where he taught for 30 years. Bonnie newman was there. I saw jerry there. I said, where is sharon . He said, im looking for her. Have you seen her . Reporter jerry left sometime after that and hasnt been seen since. He was safe. Why would he leave . I guess he wanted to see if i went home. I think its a love story. He was safe and sound. Theyre both just so brave. Theyre so brave. Reporter they had to get to each other. They looked for each other. You went back looking for him . I started to. Then i had to be rescued at the other edge of town. No, there is a person in there. Reporter when her car flooded rescuers sent in the only vehicle that could get through. They got out in wetsuits, put a life jacket on me, sat me on the seat with the mud and away we went. We saw the footage a million times on thursday. We had no idea it was our mom. Reporter in a Small Community like lyons everyone knows the former football coach and teacher. Everyone is searching. My brothers, aunts and uncles. You never forget what he taught you. He was that kind of guy. Reporter thats what his family is celebrating now. Everybody that had him in school is out looking for him. I thank everybody so much. We are just swollen with pride for him. I just cant say enough about how pride i am to be his daughter and how proud i am that he did all the right things in the end. Reporter today jerrys soninlaw and grandson were able to get behind this roadblock up into the canyon to look for more clues. So far, the only thing they have found is his overturned pickup truck in the river downhill from his house. They know thats not a great sign, brian, but they are clinging to hope. What a desperate story going on so many days now. We grieve for the families who suffered the ultimate loss. Kate snow with us from boulder, colorado. Still ahead tonight after the break well take on a consumer news story. The expiration dates on just about every product. What you should know about them so you dont throw out more than you should. Later, the chief of police in washington who found herself at the center of the news this week. What this does to how she sees her job. This man is about to be the millionth customer. Would you mind if i go ahead of you . Instead we had someone go ahead of him and win fifty thousand dollars. Congratulations you are our one millionth customer. Nobody likes to miss out. Thats why ally treats all their customers the same. Whether youre the first or the millionth. If your bank doesnt think youre special anymore, you need an ally. Ally bank. Your money needs an ally. If you have high cholesterol, heres some information that may be worth looking into. In a Clinical Trial versus lipitor, crestor got more highrisk patients bad cholesterol to a goal of under 100. Getting to goal is important, especially if you have high cholesterol plus any of these risk factors because you could be at increased risk for plaque buildup in your arteries over time. And thats why when diet and exercise alone arent enough to lower cholesterol i prescribe crestor. [ female announcer ] crestor is not right for everyone. Like people with Liver Disease or women who are nursing, pregnant or may become pregnant. Tell your doctor about other medicines youre taking. Call your doctor right away 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 rare but serious side effects. Is your cholesterol at goal . Ask your doctor about crestor. [ female announcer ] if you cant afford your medication, astrazeneca may be able to help. [ coughs ] ive got a big date, but my sinuses are acting up. Its time for advil cold and sinus. [ male announcer ] truth is that wont relieve all your symptoms. Hmm . [ male announcer ] new alka seltzer plusd relieves more sinus symptoms than any other behind the counter liquid gel. Thanks for the tip. [ male announcer ] no problem. Oh. And hair products. Aisle 9. [ inhales deeply ] oh, what a relief it is. We are back and as we mentioned we have a consumer news story that should be helpful. At least it is intended that way. In just about every american household. Its about what we buy, consume and throw away believing its no longer good. Its about the sometimes vast difference between the sell by date on a product and the use by date. When something really does go bad and how it all ties into staggering waste in this country, often because of oh consumer misunderstanding. Our report tonight from nbcs stephanie gox. Gosk. Reporter americans are wasting food a lot of it. 160 billion pounds a year, about 40 of the food supply. That means an average family of four spends more than 1500 a year on food they never eat. A report released tod blames, in large part, a confusing and unregulated labeling system. Food is still good after the sell by date and often still safe well after the use by date. For instance, these egg s have a use by date of october 16. Typically egg es are good a few weeks beyond that date. Would anyone consider eating them then . You open the refrigerator in november. They are still there. Do you make an only oh leomelet . No. Probably not. You can eat something past the sell by date. Reporter how many days past . It depends on the pruk. Sometimes they will say use or freeze by. Thats useful information to deliver to consumers. Reporter enjoy by september 21. What does that mean . Theyre telling you this product will be at its peak quality by this date. You are not going to get sick on the 22nd. Typically this product will rot and get slimy like lettuce does before it would make you sick. Reporter this is october 31. Its november 1. Can i drink this . Depending on how you handle the product. If you oh left it in a hot car for 24 hours i may not want to drink that. Reporter its about refrigeration. Versus just a date. Reporter some want government food labels regulated. They say if it looks good and smells good, dont toss it. Stephanie gosk, nbc news, new york. Up next for us tonight, the Community Haunted for decades by a mystery tonight. It may be solved after a discovery in the waters of a rural lake. Urn, caused by acid reflux disease, relief is at hand. For many, nexium provides 24hour heartburn relief and may be available for just 18 a month. There is risk of bone fracture and low magnesium levels. Side effects may include headache, abdominal pain, and diarrhea. If you have persistent diarrhea, contact your doctor right away. Other serious stomach conditions may exist. Dont take nexium if you take clopidogrel. Relief is at hand for just 18 a month. Talk to your doctor about nexium. [ male announcer ] staying warm and dry has never been our priority. Our priority is, was and always will be serving you, the american people. 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And tea parties. Ill have more awkward conversations than im equipped for, because im raising two girls on my own. Ill worry about the economy more than a few times before theyre grown. But its for them, so ive found a way. Who matters most to you says the most about you. At massmutual were owned by our policyowners, and they matter most to us. Ready to plan for your future . Well help you get there. The pain started up and wrapped around to the front. I couldnt play my bassoon because of the pressure that i felt thro