This is the cbs evening news with scott pelley. Pelley good evening. Every time there is a mass shooting, we ask the same question why . Tonight, we have a better idea of why aaron alexis opened fire at the Washington Navy yard last week. He killed 12 people before he died in a shootout with police. Among the victims was 63year old cathleen guard, and, at her funeral yesterday, the navy presented her family with a flag. The f. B. I. Said today that alexis was driven by the delusional belief that he was being controlled or influenced by electromagnetic waves beamed into his body. Bob orr has more about that and the pictures that the bureau released today. Reporter it was 8 15 on the morning of september 16 when aaron alexis appeared on the fourth floor of Navy Yard Building 197, prepared to launch his attack. Dressed in dark clothing, alexis was wearing two i. D. Badges and carrying a sawedoff shotgun. Surveillance video shows alexis moved deliberately down the hallway, checking doorways, hunting for people to shoot. Within five minutes, alexis moved to the third floor. He carefully exited a stairwell using protected positions like a trained sniper looking for new targets. As he moved toward them, a small group of people at the end of the hallway appeared to be scrambling for safety. In releasing the pictures today, f. B. I. Assistant director Valerie Parlave said the evidence showed alexis acted alone and had planned his assault as a suicide mission. There are indicators that alexis was prepared to die during the attack and that he accepted death as the inevitable consequence of his actions. Reporter parlave said there is no evidence that alexis ever shared his plans with family, coworkers or friends, but he left behind numerous clues that point to motives. His shotgun carried four scrawled messages. On the right side and barrel were the etched phrases not what yall say and end to the torment. On the left side, better off this way and my e. L. F. Weapon. Investigators say e. L. F. Refers to extremely low frequencies. Radio waves used in submarine communications. 7 information retrieved from alexis cell phone and laptop indicates he believed outside forces were using e. L. F. To control him. A document retrieved from the Electronic Media stated ultra low frequency attack is what ive been subject to for the last three months. And to be perfectly honest, that is what has driven me to this. Reporter that message and others were found on computer files inside alexis backpack, the same bag he used to sneak the shotgun into the building. Raagrticarson. Erns out, was disciplined on the job just theh that the f. B. I. Thought it was proper to release 30 seconds. It shows himself acting alone with no help, but they have no intention of releasing the other more horrific images, scott. Pelley the f. B. I. Is also on the scene of the Shopping Mall siege in nairobi, kenya. At least 72 people were killed when gunman from a Somali Terrorist Group swarmed the mall in kenya on saturday. Charlie dagata is at the mall with the latest. Reporter today, five days after the attack, more bodies were pulled from beneath the rubble of the westgate mall. New video released by the kenyan government shows the full extent of the destruction. Three floors collapsed after a fire and a series of explosions crippled the shopping complex. Today, it was still smoldering. Forensic teams from the United States and europe joined the investigation, sifting through the rubble, gathering evidence. Bomb disposal teams from the f. B. I. Began fingerprint, d. N. A. And ballistic analysis to help determine the identities of the victims and the alshabab gunmen. Government officials would say little about the attack today, other than it appeared to be well planned. The massive amount of firepower suggests the militants may have rented a store to stash their weapons inside the mall ahead of the attack. There are indications that these militants may have hired a shop inside the mall. Theyve been planning this for several months. Is there anything you can tell us about that . Reporter flags were flown at halfstaff today to mark a threeday period of mourning as kenyans continued to hold funerals for the dozens of victims killed in the attack. Tonight, for the first time, the leader of alshabab in somalia confirmed his group was responsible for the massacre in retaliation for kenyas military involvement in somalia. And, scott, he warned there would be more violence to come unless kenya pulls its troops out of somalia. Pelley Charlie Dagata in nairobi. Thank you, charlie. Irans new president told the Washington Post today he wants the dispute over his countrys Nuclear Program resolved in three to six months. Hassan rouhani insists iran has no intention of Building Nuclear weapons. Charlie rose also sat down with rouhani today and asked him about irans relationship with the United States. You have made a speech. The president has made a speech. There was no handshake, no bilateral meeting between you and the president. You suggested you didnt have enough time to plan for it. Whats necessary for you to have a bilateral meeting with the president . translated well, after all, were speaking of two countries who have had no relations for 35 years, so its clear that to begin talks requires some preparation work. And whenever the prep work is completed, i believe that its possible to have a meeting. Perhaps if we had more time here in new york, we may have been able to coordinate what was necessary for that meeting to take place. Pelley charlies complete interview with president rouhani will air tonight on the charlie rose program on pbs, but portions will also be shown tomorrow on cbs this morning. Now to that budget battle in washington and the possible Government Shutdown next week in a dispute over obamacare. In a cbs News New York times poll out tonight, 80 of americans say threatening a shutdown is no way to negotiate. If there is a shutdown, 44 say they will e republicans, 35 said they would blame the president and the democrats. One republican who is in the thick of this is ted cruz of texas. Hes fighting a losing battle in the senate to make sure any budget deal cuts off funding for obamacare. Cruz completed a 21hourplus talkathon on the senate floor today, and nancy cordes is on capitol hill. Reporter after 21 hours and 19 minutes, ted cruz stepped off the senate floor and declared victory. This was all about elevating the debate in the public and giving the American People a chance to speak. Reporter but once other republicans had the chance to speak, they said they disagreed with cruz and did not want to hold up a funding bill and risk a Government Shutdown just to wage a doomed fight to defund obamacare. Indiana republican dan coats the reality is that we will need 13 democrats to override a president ial veto. Reporter he did give cruz points for passion. He spoke continuously through the night, filling some of the time with references to childrens books. I do not like green eggs and ham, i do not like them, sam, i am. Reporter . Tv shows. Phil also said very simply, happy, happy, happy. Reporter . And movies. And just like in the star wars movies, the empire will strike back. Reporter he even compared opponents of his strategy to nazi appeasers before world war ii. Neville chamberlain, who told the british people, accept the nazis. Yes, theyll dominate the continent of europe, but thats not our problem. Lets appease them. Reporter that angered some fellow senators, including arizonas john mccain. That allegation, in my view, does a great disservice, great disservice for those brave americans and those who stood up and said whats happening in europe cannot stand. Reporter all 100 senators, including cruz, voted today to formally begin debate on the funding bill. Cruz is trying to convince his republican colleagues, scott, to try to block the passage of that bill later in the week. Pelley nancy, thanks very much. You know, we wondered earlier today whether senator cruz had made the cut in historys Longest Senate speeches. The Research Department tells us that number one is Strom Thurmond of south carolina, who spoke against a Civil Rights Act for 24 hours and 18 minutes; alfonse damato of new york tried to save a favorite defense contract, speaking 23 hours and 30 minutes; and Wayne Morrison went 22 hours and 26 minutes, which means senator cruz has secured his place in history at number 4. It caught our eye today when a Major Medical journal reported a remarkable advance in merging man and machine. Dr. Jon lapook has a look at a new prosthetic leg controlled by the wearers mind. Reporter four years ago zac vawter lost his leg in a motorcycle accident. After years in a regular prosthetic leg, he is testing the first one controlled by brainwaves. I walk up to a set of stairs and just go up foot over foot up the stairs like you do. Whereas with my normal prosthetic, i kind of have to drag it behind me as i go up the stairs. Reporter in todays new england journal of medicine, researchers described how it worked. When a person thinks about moving, a signal is sent from the brain down to the spinal cord. These impulses control the muscles. After an amputation, the muscles are no longer there, but the nerves are. Zac underwent surgery to move these nerves to his hamstrings. Sensors relay these nerve signals to a computer in the leg which instructs the knee and ankle how to move. The simplest way to explain it is, weve rewired him. Reporter researcher Levi Hargrove and a team at the Rehabilitation Institute of chicago engineered the device. You just think about moving along, the device pushes you along, pushes you upstairs, helps control you when you walk down stairs, and it does everything in a seamless manner. It really blew my mind the first time that we did that. It was a Pretty Amazing experience because i hadnt moved my ankle in a way that i could see for two years. Reporter the army funded this research hoping to improve the lives of the more than 1,200 soldiers and approximately one million americans who have lower leg amputations. Were really trying to make these advanced devices that allow them to get back to active duty or, later in life, allow them to move around their home and remain independent longer. Thats one of the primary goals of this research. Reporter the hope is that in three to five years, many more people will be able to get this new leg and with each step zac takes, researchers move closer to that goal. Pelley one of those things you have to see to believe. Thanks, doc. A former president plays a role in a samesex wedding. A rare pink diamond could set a record at auction. And silhouettes in the sand, s tribute to the one of historys turning points. When the cbs evening news continues. [ woman ] ive had it with my moderate to severe plaque psoriasis. The frustration. Covering up. So i talked with my doctor. He prescribed enbrel. Enbrel is clinically proven to provide clearer skin. Many people saw 75 clearance in 3 months. And enbrel helped keep skin clearer at 6 months. [ male announcer ] enbrel may lower your ability to fight infections. 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Icaused by acid reflux disease, relieving heartburn, 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. Pelley the Obama Administration is stepping up pressure on uninsured americans, especially young americans, to sign up for Health Insurance on those new state exchanges that will be opening next week. Today, it put out new estimates for the premiums. For instance, a 40yearold earning 50,000 and choosing the mediumpriced silver plan would pay, on average, 328 a month. Again, that is the average. As don dahler tells us, some will pay a lot more, some a lot less, depending on their location. Reporter these phone counselors are in training at the new York State HealthExchange Call center. Starting next tuesday, hundreds of them will be on duty to help guide people through the dozens of choices they face. The calls have already been powering in. Were getting about 580 calls a day, on average. Reporter what are they mainly asking about . You know, what the rate will look like. Reporter depending on where you live and what kind of plan you choose, the rates youll pay will vary greatly. In addition to the stateto state differences, rates vary from city to city within the state. In new york city, a 40yearold making 50,000 a year would pay an average of 415, but upstate, in ithica, new york, the average is 446. Thats 372 more a year. Why is there so much variation in the average premiums, even within the states . Some of it is related to the Geographic Area in the state. In the city, of course, you have, you know, thousands of providers, which is really different than if youre in a small, upstate county. Reporter its the Insurance Companies that set the rates. The more competition within a community, in general, the lower the premiums. After the exchanges are up and running, consumers will be able to read reviews on the Health Exchange web sites about how well the plans actually work. Scott, that information is intended to weed out Insurance Companies that arent living up to expectations. Pelley don dahler. Thank you, don. From health to wealth now. The Federal Reserve told us today that Household Wealth in america jumped nearly 2 in the Second Quarter of this year thanks to recordhigh stock prices and rising home values. Total wealth was nearly 75 trillion. At the depth of the great recession, it had fallen to 57 trillion. There was an earthquake so powerful, it created a new island. Well show you just ahead. L show you just ahead. ,, pelley today, we got a look at a diamond that could be the most valuable ever put up for auction the pink star, weighing in at nearly 60 carats. When mounted on a ring, it is big enough to cover a models finger up to the knuckle. The diamond is expected to sell for more than 60 million when it auctions in november. There was a samesex wedding in maine over the weekend and a former president served as a witness. George h. W. Bush signed the marriage license for bone Bonnie Clement and helen tortleson. The couple own a general store near the bush compound in kennebunkport and are longtime friends of the former first family. There was a massive 7. 7 earthquake in pakistan that killed at least 300 people and destroyed homes. The quake yesterday also created this island in the arabian sea. Its made of mud and stone. Its about 60 feet high and about as long as a football field. Scientists say the release of volcanic gases may be what formed the island, but they admit theyre not really sure. We do know the origin of a remarkable tribute to the soldiers and civilians who lost their lives during the dday landings nearly 70 years ago. Volunteers stenciled 9,000 silhouettes in the sand on a beach in normandy in a project called the fallen. The artists wanted to give a human perspective to the invasion that changed the course of world war ii. A few hours later, the tide washed them away, a reminder of the tragedy of war. Our cup run is over. Well tell you how it all turned out for team u. S. A. Next. , start into a winning finish. Next weather talent appears at wx center with generic pelley finally tonight, they did it on San Francisco bay, team u. S. A beat new zealand today to retain the americas cup with one of the greatest comebacks. After trailing eight races to one, the americans won eight in a row to finish 98. Bill whitaker has more on how they did it. Reporter just a week ago, team u. S. A. Looked like they were sunk, but they replaced a key crew member, tweaked tactics and won seven races in a row. This is it, this is it reporter in todays door die tiebreak, the u. S. Trailed early and flew by Team New Zealand and never looked back, beating their rival by 44 seconds. No more singlehulled sailboats but 72foot carbon fiber catamarans with a rigid 14story wing. They fly across the water thanks to underwater wings called hydrofoils. Theyre over 50 miles an hour at times. Reporter Kimball Livingston blogs about the race. These are the fastest boats ever built. Weve never seen anything like this in any kind of sailing competition, much less at the americas cup. Reporter they dont just look spectacular. Theyre spectacularly expensive, 100 million to build and operate. The deep pockets behind oracle team u. S. A. Is Larry Ellison, c. E. O. Of oracle Computer Systems and one of the wealthiest men in the country. Traditionalists claim hes blowing the race out of the yacht club and into the stratosphere. Everything they did was all about the new vision of what racing could be, and not everybody could keep up. Reporter thats a lot of money. An Americas Cup Team is always going to spend as much as it can get, and its never going to be any different. Americas cup will stay in america. The victors were hailed as heroes today, and on this one gleaming day in San Francisco, a billionaire was just one of the guys. Bill whitaker, cbs news, San Francisco. Pelley and thats the cbs evening news for tonight. For all of us at cbs news all around the world, good night. Captioning sponsored by cbs captioned by Media Access Group at wgbh access. Wgbh. Org your realtime captioner is mrs. Linda m. Macdonald [ applause and cheers ] americas cup will stay in america oh, yeah, baby. The San Francisco bay, the scene of sports history as oracle pulls off a comeback for the ages. The conclusions to an embattled competition that ultimately lured thousands to the waterfront. Whoo good evening, ill elizabeth cook. Im ken bastida. They did it. Its over and with the regatta finally over San Francisco is looking forward, moving trucks breaking down the band stands. Will americas cup be back in the bay . Our allen martin joins us now from pier 27. Allen. Reporter hey, ken. You know, as of right now, we have not heard officially whether the 35th americas cup would be held here in San Francisco. But minutes ago mayor lee said he certainly wants the races to come back. Also, Larry Ellison had a press conference. He said he is open to the idea. So well have to wait and see. Because as the winner of the cup now, it is his decision as to where to hold the next series of races. But as for right now, right here today, we witnessed one of the greatest comebacks in sports history. A week ago, Team New Zealand held a strong 81 lead. Needed only one more race, nine races win, thats it. It would have sealed the deal but oracle put up a fight ultimately claiming victory after 8 consecutive wins and it was of course the moment the team and its supporters were waiting for. Crowds cheering the trophy as it was handed back to the defending oracle champs. Thats by the way the trophy almost dropped there right at the height of the celebration but several folks saved it from hitting the ground. After sailing across the finish line