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 shoot-out with police. among the victims was 63-year-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 escape 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 sawed-off shotgun.

surveillance video showed alexis moved deliberately down the hallway, checking door ways, hunting for people to shoot. within five minutes, legacy moved to the third floor. he carefully exited a stairwell use, protected positions like a trained sniper looking for new targets. as he moved toward them are 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 indicator indicatot alexis was prepared to die during the attack and that he accepted death as the inevitable consequence of his actions. parlave said there is no evidence alexis ever shared his plans with family, coworkers or friends but he left behind numerous clues that spoke to motives. his shotgun carried four scrawled messages. on the right side and barrel

were the etched phrases, "not what you all say." and "end to the torment." on the left side, "better off this way." and "me e.l.f. weapon." investigators say e.l.f. refers to extremely low frequencies. information retrieved from alexis' cell phone and lapdop indicates he believed outside forces were using e.l.f. to control him. >> a document retrieved from the electronic media stated "ultralow frequency attack is what i've 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. now, investigators say the rampage was not directed at any particular person. while alexis, it surgeons out, was disciplined on the job just three days before the peak,

there's no evidence he targeted his boss, his coworkers or anyone he'd even met. >> pelley: bob, there are hours of surveillance tape. the foib released 30 seconds. what is on the rest of tape? >> reporter: terrible images, scott. the tape shows alexis moving through the buildings. obviously it shows the moments of violence and gunfire. but it's important to say here the f.b.i. thought it was proper to release 30 seconds. ist shows himself acting alone with no help but they have no intention of releasing the other 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 from gunman from a sho maury terrorist grouped swarmed the mall in kenya on saturday. charlie d'agata 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 of 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 disploazal teams from the f.b.i. began fingerprint, d.n.a., and ballistic analysis to help determine the identities of the victims and the alhelp shabab gunmen. government officials would say little about the attack today, other than it appeared to be well planned. the massive amount of firepower subtles the militants may have rented a store to stash their wbz inside the mall ahead of the attack. there are indications that the militants may have hired a shop inside the mall. they've been planning this for several months. is there anything you can tell us about that? >> whether the terrorists hired a shop in the mall is a rumor we have heard just like you, and we

will treat it as such until the forensic exercise and any other investigation taking place prove it otherwise. >> reporter: flags were flown at half-staff today to mark a three-day 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 al-shabab in somalia confirmed his group was responsible for the massacre in retaliation for kenya's military involve independent somalia, and, scott, he warned there would be more violence to come unless kenya pulls its troops out of somalia. >> pelley: charlie d'agata in nairobi. thank you, charlie. iran's new president told the "washington post" today he wants the dispute over his country's 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 iran's relationship with

the united states. >> reporter: 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 didn't have enough time to plan for it. what's necessary for you to have a bilateral meeting with the president? >> ( translated ): well, after all, we're speak of two countries who have had no relations for 35 years, so it's clear that to begin talks requires some preparation work, and whenever the prep work is completed, i believe that it's 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: charlie's 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 blame the 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. he's fighting a losing battle in the senate to make sure any budget deal cuts off funding for obamacare. cruz completed a 21-hour-plus talk-a-thon 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 overright-- override a presidential veto. >> reporter: hay did give cruz points for passion. he spoke continuously through the night filling some of the time with references to children's 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, they'll dominate the continent of europe. but that's not our problem. let's appease them. >> reporter: that angered some fellow senators, including arizona's john mccain. >> that allegation, in my view, does a great disservice, great disservice for those brave americans and those who stood up and said what's happening in europe cannot stand. >> reporter: all 100 senators, including cruz, vote today to formally begin debate on the funding bill. cruz is trying to convince his republican colleagues, scott, to try to block the passage thaft bill later in the week. >> pelley: nancy, thanks very much. you know, we wondered earlier today, whether senator cruz had made the cut in history's longest senate speeches. the research department tells us that number one is strawm thurmond of south carolina who

spoke against a civil rights act for 24 hours and 18 minutes. alfonse do mountaino of new york tried to save a favorite defense contract, speaking 23 hours, and 30 minutes, and wayne morrison went 22 hours and twaix 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 awarer's 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 brain waves. >> i walk up to a set of stairs and just go up foot over foot up the stairs like do you. whereas requestw my normal prosthetic i kind of have to drag it behind meaise go up the stairs. >> reporter: in today's "new

england journal of medicine" research erpz described how it worked. when a person thinks about moving a signal is sent from the brain to the spinal cord. these impulses control the muscles. after an amputation, the muscles are no longer there, but the nervouses are. zac underwent surgery to move these nerves to his hamstrings. sensor relays 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 we've rewider 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 downstairs, and it does everything in a seamless manner. >> it really blew my mind the first time that we did that. it was pretty amazing experience because i hadn't moved my aichgle i 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 1200

soldiers and aprisoldiers and ae million americans who have lower beg amputations. >> we're really trying to make these advanced device thalz allow them to get back to active duty or later in life allow them to move around their home and remain independent longer. that's 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 same-sex wedding. a rare pink diamond could set a record at auction. and sill wets in the sand fay tribute to the one of history's turning points. when the cbs evening news continues.

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icaused by acid reflux disease, relieving heartburn, relief is at hand. for many, nexium provides 24-hour 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. don't 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 40 years earning $50,000 and choosing the medium-priced 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 health exchange call center. starting next tuesday, hundreds of them will be on duty to help guides guidepeople through the dozens of choices they face. the pauls have already been powering in. >> we're 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 you'll pay will vary greatly. in addition to the state-to-state differences, rates vary from city to city within the state. in new york city, a 40-year-old making $50,000 a year would pay an average of 415, but upstate, inith carks new york, the average is capitol hill 446. that's $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 you're in a small, upstate county. >> reporter: it's the insurance companies that set 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 aren't living up to expectations. >> pelley: down 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 record-high 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. we'll show you just ahead. coun. thanks for the tip. [ male announcer ] no problem. oh...and hair products. aisle 9. [ inhales deeply ] oh what a relief it is. ♪

♪ [ male announcer ] bob's heart attack didn't come with a warning. today his doctor has him on a bayer aspirin regimen

to help reduce the risk of another one. if you've had a heart attack, be sure to talk to your doctor before you begin an aspirin regimen. >> 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 carets. when mounted on a ring it is big enough to cover a mold's finger up to the knuckle.

the diamond is expected to sell for more than $60 million when auctions in november. there was a same-sex wedding in maine over the weekend and a former president served as a witness. george h.w. bush signed the marriage license for bone clement and helen tortled son. the couple own a general store near the bush couple pound in kennebunkport and are longtime friends of the former first family. therthere 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. it's made of mud and stone. it's 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 they're not really sure. what we-- we do know the origin of a remarkable tribute to the soldiers and civilians who lost their lives during the d-day

landings nearly 70 years ago. volunteers stenciled 9,000 sill wets in the sand on a beach in norm andy 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 air, reminder of the tragedy of war. our cup run is over. we'll tell you how it all turned out for team u.s.a. next. lawye r holding. ♪ feet, kicking. better things than the joint pain and swelling of moderate to severe rheumatoid arthritis. if you're trying to manage your ra, now may be the time to ask about xeljanz. xeljanz (tofacitinib) is a small pill for adults with moderate to severe ra for whom methotrexate did not work well.

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.>> pelley: finally tonight, they did it-- on san francisco bay, team u.s.a a.beat new zealand today to retain the america's cup with one of the greatest comebacks. after trailing eight races to one, the americans won eight in a row to finish 9-8. 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 up with seven races in a row. >> this is it, this is it! >> reporter: inia today's do-or-die thai break ethe u.s. trade early and flew by team new zealand and never looked back, beating their rival by 44 academy ises.

no more single-hulled sailboats but 72-foot carbon fiber catamarans with a rigid 14-story wing. they fly across the water thanks to underwater wings called hydrofoils. >> they're over50 miles an hour at times. >> reporter: kimball livingston blogs about the race. >> these are the fastest boats ever built. we've never seen anything like this in any kind of sailing competition. much less at the americas cup. >> reporter: they don't just look spectacular. they're 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 he's blowing the race out of yacht club and into the stratas fear. >> everything they did was all about the new vision of what racing could be. and not everybody could keep up. >> reporter: that's a lot of money.

>> an americas cup team is always going to spend as much as it can get, and it's 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 frarng a billionaire was just one of the guys. bill whitaker, cbs news, san francisco. >> pelley: and that's 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

three big "e.t." exclusives. kirstie alley, bill clinton and rebel wil >> scared to death, the wild new video. what happened when she landed? >> then, kris son.jenner's crus over lamar. >> explaining lamar's drug issues. any comments? >> why khloe's husband is defending the kardashians. >> plus, richard gere getting a