This is the cbs evening news. Good evening. Im jim axelrod with a western edition of the broadcast. More than three dozen people are dead following an attack in nairobi, kenya. Several american americans are d to be among the injured, and a terror group with links to al qaeda is claiming responsibility. Witnesses report five gunmen opening fire in a new fourstory mall and taking hostages. Charlie dagata begins our coverage. We warn you, some of these pictures are disturbing. Reporter police scrambled for cover as gunshot rang out at an up market Shopping Mall in nairobi. Inside, the mall, popular with westerners was under siege. Witnesses said a group of men armed with automatic weapons stormed the Shopping Center and shouted anyone who was a muzz lum could leave. They then started spraying gunfire and lobbing grenades into crowds. These graphic pictures of the aftermath snow elderly people, women, and children among the dead mall worker sudjar singh says police were no match for the gunman. Gunman. Terrified shoppers took cover for hours, trying to make their escape any way they could, even crawling through air vent. U. S. State Department Said american citizens were among the wounded and condemned the attack as a senseless act of violence. As people sprinted out of the Shopping Center and emergency crews tended to wounded survivors, kenyan soldiers rushed in to flush out the militants. But for the dozens dead and more than 150 wounded, it was already too late. The Al QaedalinkedSomali Militant Group alshabib. Jim, tonight, they warned more attacks were on the way. Axelrod charlie, thank you. Lets bring in our Senior National security analyst juan czaraty in washington. Juan, Charlie Dagata is reporting the al qaeda affiliate al shabib is claiming responsibility. They are an affiliate of al qaeda operating in somalia for a number of years. Its been fighting for control of mogadishu in parts of somalia, but acted outside of somalia, not just in kenya but also in uganda. It has also served as a source of recruitment for westerners which has raised concerns for american authorities. Axelrod how concerned, even though this attack is taking place in kenya, how concern read american intelligence officials . Well, theyre very concerned. This is one of several Al Qaeda Affiliated that are flexing their muscles, creating havoc regionally but also serving as a source of radicalization and recruitment for westerners, including americans, an american was just recently killed in somalia by the al qaeda affiliates, and so u. S. Officials are worried about theitize to the u. S. As well as the regional instability that groups like al shabib represent. Axelrod and of course americans reported injured in the attacks today. Syria appears to be cooperating with the plan to get rid of its chemical weapons. Today, the u. N. Backed weapons watchdog confirmed it received a disclosure from the assad regime, detailing its chemical arsenal. This would meet the first deadlineave deal forged between the u. S. And russia last week. World leaders will take up syria next week when they arrive in new york for the United Nations general assembly, which could also provide an opening for talks between the u. S. And iran. Elizabeth palmer joins us now from lobd. Liz, are the iranians any more serious about direct negotiations with the u. S. Than they have been in the last 10, faeb years. Reporter theyre signaling very hard they are. The backdrop is irans economy is in real trouble because of the u. S. Led sanctions. Theyve been very effective and peoples standard of living is dropping. So the new president has been elected on a broad mandate to get those sanctions lifted to improve peoples lives so hes coming to new york, knowing hes got the peoples backing. And just as important is the fact that the Supreme Leader the power behind the president , if you like, in iran, hes saying for the first time flexibility is a virtue. So the time has never looked more capricious than now. Axelrod what would the central issue be in any negotiations . Reporter Irans Nuclear program. Iran want to preserve the right to continue to enrich uranium, it says to make power plant. Okay. The United States doesnt really believe that. On the other hand, thinks that it cant stop iran from enriching but it can insist on a much greater oversight. U. N. Inspectors watching like hawks to make sure that iran is not diverting down military path toward a weapon. Axelrod attacks by suicide bombers in iraq today killed at least 96 people. The deadliest was in backgrounds sadr city neighborhood. Suicide bombers targeted a shiite funeral killing at least 72 and wounding more than 120 others. A surge in sec taish violence has killed more than 400 iraqis this month. Neither president obama nor House Republicans are showing any sign of ending their impasse about funding the new health care law, even though open enrollment starts in just a few days. As carter evans reports, much of the public is still confused about what the law actually provides. Reporter california is just beginning the big push to get residents to sign up for the new health plans. Its a tough sell, says Community Organizer pal bradsh l bradshaw. Pal bradshaw. Appropriate 10 days before enrollment begins, 75 pfers californians still no little or nothing about how the Affordable Care act could affect them. Why is it, do you think that so few people understand whats going on . We havent had enough marketing. I feel like we need more marketing. We need more information out there. Welcome to covered california. Reporter the states 45 million multilingual ad campaign is only now getting under way. Just as republican lawmakers are trying to pull the plug on the entire plan. U. S. C. Health policy professor geoffrey joyce. How much of a distraction is the partisan bickering in washington right now joit creates uncertainty, and uncertainty creates anxiety. Reporter and the pressure is already high. The law requires all americans to have Health Insurance by january 1. Its really those who have been on the margin who most benefit from this, but thats who we have to target and try to inform about the benefits of this legislation. Reporter like 28yearold consuelo dwaiton. Shes self i have my dog insurance, auto and home. Reporter but no Health Insurance. No Health Insurance whatsoever. Reporter its because she cant afford it. Is it frustrating . Absolutely frustrating. What would happen if i was in injured . Troarpt these shooez in limbo like millions of others until the new plans kick in. Axelrod a series of shootings across chicago last night left four people dead and another four wounded. Dean reynolds tells us the gunfire comes hard on the heels of a shooting thursday night at a Neighborhood Park that wounded 13 people. Reporter with the city reeling, Rahm Emanuels frustration was apparent. For a city to have a sense of civility, a sense of community tmust live by a moral code, not a code of silence. Reporter but the code of silence is hard to break in ganginfested, druginfused areas like the park where a gunman opened fire thursday night. Reporter today a group of former and current n. B. A. Stars gathered for a neighborhood basketball game to show support for the local community. Isaiah thomas is from chicagos west side. Its hard enough being poor. Its hard enough living in the household with no resources, but when you put weapons and drugs inside of that household, weve got no shot. Reporter Police SuperintendentGarry Mccarthy said friday a militarystyle Assault Rifle was used in one shooting this week, a trouble ling escalation from the usual handguns. As mccarthy was speaking a federal grand jury convicted david big man lewisbey . A drugsmuggling scheme. They used evidence from his cell phone and Facebook Page which showed him with wads of cash and lots of gun. He faces up to 35 years in prison for doing exactly what the police here are trying to stop. Dean reynolds, cbs news, chicago. Axelrod later, this American Nuclear bomb almost blew up in North Carolina 52 years ago. Well talk to the author who uncovered the details. And hundreds of partying teenagers trashed this former nfl players house. Guess how many came to help clean it up. Well tell you when the cbs affect news continues. Axelrod this week, the home of a former nfl player was ransacked by teenagers who used the house for a party. After they posted pictures of themselves online, the player invited the kids to help him fix the damage. Don dahler shows us just how many showed up. Reporter former are nfl lineman Brian Holloway offered in his words redemption to the teens who trashed his home while he was way. We showed you the tens of thousands of damage caused by partiers. Holloway says he first saw the results on social media. Im watching the tweets and listening to them saying what a great party. And im going, you have to be kidding me. Reporter he found holes punched in walls, graffiti, andrein stained carpets but the teens left plentyef evidence, including on social media. He reached out to them. A rumor spread that anyone coming would be arrested, but he was hoping for more than this. Only three of the kid who were here that night and her parents. Why do you think the parents arent here with these kid if they know what their kids did . I cant even wrap my head around it. If my kid was there, that money minute, that day i found out, my life stops, i grab them by the scruff of their neck, were going over to the house way toothbrush, and that child is going to stay there if they have to clean that for the rest of their life. Reporter what was it like here that night . It was crazy. There were so many people. It was body to body. Reporter these are pictures of 15yearol 15yeara byrnes. She didnt know they were trespassing but when she found out she policied to holloway. I felt guilty and wanted to cloor my conscience a little bit. Reporter her mother, annette byrnes, says she, too, has learned a lesson from this. We just need to be more in tune with the kids. I think a lot of times we werent. Reporter holloway says some of the parents are threatening to sue him over photos he posted on his web site. Their kids took of themselves while on his property. So far, none of the teens has been arrested. Jim. Axelrod don, thank you very much. Up next, hong kong braces for impact as deadly typhoon pummels the pacific. Schlosser Schlosser Axelrod there is a monster storm in the western pacific tonight. Typhoon usagi is nearly 700 miles wide with winds gusting to 150 miles per hour. Right now, it poses a Severe Threat to hong kong where its expected to strike tomorrow night. It blew through the luswron straits today. At least two people were killed. Within hours, a Chinese Court is expected to hand down its verdict in the trial of bo xilai, the highest ranking official to be tried for corruption in years. Seth doane on the trial offering a rare look into the usually secret world of the ruling communist party. Reporter this trial offerredly the first glimpse of bo xilai in 18 months. Since this oncepopular rising star in the communist party fell from power. He faced charges of bribery, abuse of power, and embezzle. This is a trial by the communist party of a senior political guy that went off the rails, in their mind. Author James Mcgregor has worked in china for 25 years. He said bo xilai was perceived as a threat. He was a celebrity, really, of sorts in china. Well he was a westernstyle politician who people really liked and you dont do that in this party. This is a party of gray men who kind of hide behind the party, not their own personality. Reporter prosecutors charged that around 3. 5 million in bribes, mostly from a wealthy businessman, were funneled through bos wife and son. Bos political life started to come apart after the 2011 murder of a british businessman. His wife, gu kailai, was found guilt of killing him, and bo was charged with using his position to try to cover up the murder. Bos wife testified against her husband. She told stories of safes filled with cash hidden in the couples homes. Bo called his wife crazy and mounted a vigorous defense. He acknowledged mistakes in leadership, but did not admit guilt. The communist party, which runs china, also runs its courts. And while its not nobody yet how much jail time bo might serve, it is almost certain hell be found guilty. Seth doane, cbs news, beijing. Axelrod this Hydrogen Bomb nearly exploded in North Carolina half a century ago. So how safe are our weapons today . Well hear from the man who wrote the book on it next schieffer a newly disclosed document reveals a u. S. Hydrogen bomb almost detonated near goldsboro, North Carolina, in 1961, and according to a new book by the author Eric Schlosser, that near miss is not an isolated event. In fact, far from it. The pentagon has issued an official list of broken arrows, of serious weapon accidents that could threaten the public, and there are 32 accidents on that list. I found that 32 is actually a small fraction of the number of accidents that occurred. One document that i obtained from the Sandia National laboratory, which is one of our big weapons laboratories, listed 1200 Nuclear Weapons involved in accidents or incidents that threatened safety between 1950 and 1968. Axelrod 1200 . 1200. Now, some of them were relatively trivial, but they were Nuclear Weapons accidents that werent as dramatic as a plane crash or a missile exploding. They were actually very dangerous. Axelrod what is the closest weve come in the last 60 years to a major disaster . In 1961, in january, there was a b52 bomber that started leaking fuel while it was preparing the emergency landing, there was a weight imbalance, and the plane started to break apart midair. There were two Hydrogen Bombs on the plane, and as the plaeb was breaking apart midair, there were so many wires that if one of those wires had crossed with the wire o arming wire of the b, there would have been a fullscale detonation of this Hydrogen Bomb in North Carolina. There would have been huge firestorms and the lethal radioactive fallout could have extended as far north as washington, d. C. Axelrod youre not just documenting in your book close calls in the past. Yeah. Axelrod are you saying this is also a problem that continues to confront us presently. The defense Science Board issued a report just this year saying that our Nuclear Command and control system might be vulnerable to being hacked. Axelrod even if the United States gets its act together in terms of command and control, theres a world out there which doesnt adhere to the same standards. Absolutely. And i think that the greatest threat that we face in the shortterm sense in the world is the use of a nuclear weapon. Our controls and our systems are superior to that of any other nation. But when you look at the long list of accidents and near misses that weve had, despite our expertise, it gives you enormous pause about other countries like pakistan, india, north korea having Nuclear Weapons. Axelrod and you can see our full interview with Eric Schlosser on our web site, cbsnews. Com. And coming up, a homecoming Football Game in the colorado flood zone. Axelrod finally tonight, colorado faces a long road to recovery following this weeks historic flooding. Lyons, colorado, saw the worst of it. But as anna werner reports, people there are already fighting for a comeback. Reporter for this Football Game, the coach delivered a pep talk full of emotion. I believe in the end theres going to be a lot more good memories that come out of this than bad. Reporter just over a week ago, floodwaters consumed these plairds hometown. Residents dont know when or if theyll be able to rush. So many came here. Players and cousins gaspar and Aaron Vasquez both lost their homes in the flooght. I couldnt watch it. When i went out to practice, it felt like i was back again. Reporter Abbie Liquori is a sophomore cheerleader. Just trying to see all my friends and just keep my head up because i know it will get better in the end. But we just have to get through the hard times together. Reporter students will be attending class in a loand building here in long mond for now. Most are living in temporary homes. Some members of the band played loaned instruments today. Karen gregg is band director. Something as normal as playing fair Football Game can be really reassuring. Reporter the game wasnt trouble free. In the Second Quarter a player broke his leg. We have to overcome again. This is one more thing thrown at us. Reporter but lyons still won the game, 287. Anna werner, cbs news, long people from attending a sou bay celebration. The last day of summer brings the first significant downpour of the rainy season but it didnt stop people from attending a south bay celebration. The as win todays game bringing them a step closer to clinching a spot in the play offs. And a california homecoming queen brought to tears. A powerful message thats making headlines. Kpix 5 news is next. ,,,, your realtime captioner is linda marie macdonald. Good evening, im ann notarangelo. Recordbreaking rainfall in the bay area on this last day of summer. This is daly city around 10 30 this morning ra