this is the "cbs evening news" with scott pelley. >> pelley: good evening. we got new numbers today on the devastation in oklahoma, and they are every bit as numbing as the pictures we've been showing you since the tornado on monday. the mayor of oklahoma city said today as many as 13,000 homes were damaged or destroyed and 33,000 people have been affected. the mayor says the damage total could top $2 billion. the state medical examiner tells us there were 24 deaths; two of them were infants, four months old and seven months old. most of the children who died were in schools, and today parents are asking why those schools don't have shelters. here's elaine quijano. >> reporter: so this is where you rode out the storm? >> it is. >> reporter: helen grant rode out the tornado in her neighbor's underground shelter in moore. she thought her two daughters were also in a shelter at their nearby elementary school. instead, they huddled in a bathroom. >> really upset. i know there are shelters in some of the schools, and the fact that there weren't shelters in the other schools shows that there's a disparity. >> reporter: eight children were killed monday when the tornado destroyed two schools. neither had a shelter. there is no state law in oklahoma requiring schools to have safe rooms or tornado shelters despite the increased risk of tornadoes. albert ashwood, oklahoma's director of emergency management, says the state has built safe rooms in about 100 schools, but it's costly. >> most of these projects have been anywhere between $600,000 to $1 million, and they've usually all been applied to brand-new construction of new schools. >> i don't think you can put a price on human life. and even if the storm doesn't hit your town in the next 20 years, you're making an investment in the children of the future. >> reporter: right now, many children in oklahoma schools are instructed to take cover in bathrooms or hallways. but, according to the state's own insurance commissioner, john doak, hallways can't protect against the strongest storms. >> it's not a safe place enough for kids in an f-5 tornado, 200 mile-an-hour-plus winds. anything above ground, as we can see, is going to be taken off. >> reporter: in moore, mayor glenn lewis says he plans to tsh for new houses to have shelters or safe rooms. because what's the requirement right now? >> we don't have one, and it's been a free market society. >> reporter: the mayor says 2,000 shelters were built in private homes, but he didn't believe it was necessary to require them until now. >> who thought that you would have an f-5 tornado-- which are such a rare occurrence-- happen in the same place twice? and we just hope it doesn't happen again. >> reporter: alabama is the only state that requires safe spaces to be built in new schools according to the national storm shelter association. scott, that law was passed after a tornado in 2007 that killed eight children. >> pelley: elaine, thank you very much. shelters did save lives at homes, and so did the sirens that sounded 16 minutes before the tornado hit, giving residents the time that they needed to leave their homes and find a safer place. today, some of those residents began returning to see what the tornado did, and anna werner has that. >> reporter: residents of southwest tenth street finally got a chance to see up close what's left of their lives. and for coy nichols and ali fernandez and nearly every one of their neighbors, it was not much. >> had the worst feeling in my stomach. i was like a zombie. i couldn't think. i stood on my porch and just couldn't believe it. i didn't know where to start. >> reporter: their first mission was to find their pets, three cats they left behind. >> got the cat! >> and looks like we just got the cat. >> reporter: the sight of their neighborhood turned to a wasteland was almost more than they could handle. >> i literally ran down the street crying and just screaming, and i didn't care what anybody thought about me at that time. >> reporter: you have been through four... >> i have been. >> reporter: city manager steve eddy has been through four tornadoes here since 1998. he's faced with the task of cleaning up this mess. >> there's literally an old joke about how do you eat an elephant? one bite at a time. that's literally what you do. you go block by block, house by house picking this stuff up. >> reporter: eddy estimates it will take six months to clean up, five years before moore will be fully back to normal. >> it's a herculean task, but it can be done. it's easily done. >> reporter: many residents say they'll stay here and rebuild, but coy nichols and ali fernandez say they won't be among them. >> i'm looking at other options because, to come out on this porch and it not be this house, it wouldn't be the same. >> reporter: people who do choose to stay in this neighborhood will also be living with the memory of the eight children who died there at the plaza towers elementary school. scott, it sits in the heart of this subdivision. >> pelley: anna, thank you very much. there were developments today in the i.r.s. story. lois lerner is the head of the i.r.s. division that was caught targeting conservative political groups. learner was supposed to testify in front of the congress today and members had a lot of questions. but after she took the oath, no one expected what happened next. nancy cordes is on capitol hill. >> reporter: lois learner tried to have it both ways today, delivering an opening statement but then refusing to answer questions. >> i have not broken any laws. i have not violated any i.r.s. rules or regulations. and i have not provided false information to this or any other congressional committee. >> reporter: lerner is the i.r.s. director who ordered agents to stop the inappropriate scrutiny of tea party groups, but she never mentioned the infraction to lawmakers, nor, it appears, to her superiors. in a conference call with reporters nearly two weeks ago, learner suggested she stayed quiet because the issue never came up. lawmakers say they asked her repeatedly about rumors of targeting in hearings and meetings last year. >> ms. lerner, would you be willing to answer questions specifically related to the earlier statements made under oath before this committee? >> i decline to answer that question for the reasons i have already given. >> reporter: after lerner pled the fifth today, she was allowed to leave... >> the witness and counsel are dismissed. >> reporter: ...over the objection of republican trey gowdy. >> she just testified. amendment rights and privilege. you don't get to tell your side of the story and not be subjected to cross-examination. she ought to stand here and answer our questions. >> reporter: after some reflection, the chairman, daniel issa, agreed and said that he would call lerner back soon to testify to try to get her to answer some of those questions. scott? >> pelley: nancy, thank you. in florida this morning, a man with ties to one of the boston bombing suspects was shot to death as he was being questioned by investigators. here's justice correspondent bob orr. >> reporter: the shooting happened inside this orlando apartment complex as an f.b.i. agent and massachusetts state police detectives were questioning ibrahim todashev about his friendship with accused boston marathon bomber tamerlan tsarnaev. the two chechen immigrants once trained together at a boston area gym, but evidence also suggests a criminal connection, involvement in a grisly triple murder that occurred in september 2011 in waltham, massachusetts. three men, including one who trained at the same gym, were found with their throats cut. their bodies had been covered with marijuana and thousands of dollars in cash. no one has been charged, but sources say, during questioning last night, todashev implicated himself and tamerlan tsarnaev in the killings. as investigators pushed at him towards a confession, he snapped. law enforcement officials say the 27-year-old mixed martial arts fighter made a move that threatened the investigators. the f.b.i. agent shot and killed him. the f.b.i. became interested in him after phone records suggested a connection to tamerlan tsarnaev. over several weeks, agents kept tabs on todashev and questioned him a handful of times. the f.b.i. found nothing connecting todashev to the boston attacks. todashev, who lived in the u.s. for the past several years, was arrested two weeks ago on an aggravated battery charge, but now investigators want to find out if he had any connections at all to anything worse, including radical extremists overseas. scott? >> pelley: thank you, bob. there was a bizarre scene in london today. a man was killed in cold blood in broad daylight by two men that the british prime minister says were terrorists. and the men didn't try to get away; they stayed around to tape a video message. charlie d'agata has our story. >> you people will never be safe. >> reporter: this is one of two men who london police said used a knife and clever to hack the victim to death. this video was recorded by a passerby who was unarmed. the suspect appeared to have a london accent. >> we must fight them as they fight us, an eye for an eye and a tooth for a tooth. i apologize that women had to witness this today, but, in our land, our women have to see the same. >> reporter: the two suspects didn't flee. instead, they waited 20 minutes for police to arrive. one of the men had a gun. >> reporter: police wounded both men. they are now in the hospital and in custody. >> pelley: charlie d'agata is joining us now in london. charlie, they said "our country." what did they mean by that? >> reporter: well, that, too, remains a mystery tonight. witnesses said that the men shouted "god is great" in arabic during the attacks. british prime minister david cameron has cut short a trip to paris in order to attend emergency meetings here, and, scott, security has been increased at army barracks across london. >> pelley: well, we'll know more about this tomorrow. charlie, thank you very much. holly williams goes undercover to investigate factories where a lot of our clothes are made. and they escaped the tornado with no time to spare. when the "cbs evening news" continues. break a leg! i used to love hearing that phrase... but not since i learned i have postmenopausal osteoporosis and a high risk for fracture. i want to keep acting but a broken bone could change that. so my doctor and i chose prolia® to reduce my risk of fractures. prolia® is proven to help make bones stronger. i take prolia®. it's different- it's two shots a year. do not take prolia® if you are pregnant, are allergic to it or if you take xgeva® ..prolia® can cause serious side effects, including low blood calcium levels, serious infections, some of which may require hospitalization... ...and skin inflammation, rash and eczema. tell your doctor if you develop dental problems ..as severe jaw bone problems may happen, or if you develop new or unusual pain in your hip, groin or thigh, as unusual thigh bone fractures have occurred. what's out there matters to me.. ...so does what's in here. break a leg! ask your doctor if prolia® is right for you. we just didn't know that our plants did, too. then we started using miracle-gro liquafeed every two weeks. now our plants get the food they need while we water. so they're bigger, healthier, and more beautiful. guaranteed. when you feed your plants, everyone grows with miracle-gro. mommy's having a french fry. yes she is, yes she is. [ bop ] [ male announcer ] could've had a v8. 100% vegetable juice, with three of your daily vegetable servings in every little bottle. >> pelley: many of the clothes in american stores are made in bangladesh, a country which has a long history of workplace disasters. six months ago, 112 workers died when their factory burned. last month, a factory collapsed, killing more than a thousand in one of the worst industrial accidents ever. that got us to thinking about the conditions that produce the clothes we wear, so we sent holly williams to bangladesh. the only way to find out what's really going on is to go undercover, so that's what she did, telling the factory owners she was interested in doing business. >> reporter: if you own clothes that were made in bangladesh, this is where they come from. it's one of the poorest countries in the world, and your clothes could have been made in a factory like monde apparels. posing as buyers, we filmed secretly inside the factory which employs 1,400 workers. sells for just under $10. we saw them making shirts for wrangler, and asics sportswear they said was for the american market. the managers told us the factory hasn't been approved by wal-mart for production but they still had an order for a million wal- mart boxer shorts, subcontracted to them by another factory. in bangladesh's giant garment industry, factory fires are common and deadly. the boss at monde apparels, masudul haq chowdhury, showed us an evacuation map marking the location of 13 fire extinguishers, but nearly all of them were missing. there are several hundred workers on this floor of the factory, and the manager tells us that it's more than 100,000 square feet. but so far we've only spotted two fire extinguishers. >> reporter: and if there were a fire, the workers would find this emergency exit door blocked by boxes. chowdhury was adamant that his company doesn't allow child labor. they're all 18, are they? >> until 18 we don't employ them. >> reporter: they're all over 18? >> all over 18. >> reporter: some of them, though, looked much younger. we couldn't speak with the workers freely inside the factory, so we went looking for them after work in this overcrowded slum. this woman and her daughter both work at monde apparels. they each earn around $50 a month. they asked us to hide their faces, scared they'd lose their jobs for speaking out. the daughter told us she was just 12 years old and one of many children working at the factory. she gave the factory a fake birth certificate showing her age as 18, dodging the rules on child labor because her family needed the money. do you think that the factory bosses suspect that your daughter is still a child? she said they must know that her daughter is underage. the woman told us monde apparels doesn't give workers a pay slip. "last month, i worked 20 days, but they only paid me for 11," she said. "if i question them, they yell at me." but she feels lucky to have a job and told us there's been a big change at the factory in the last six months. "nowadays," she said, "when we make a mistake at least the supervisors don't beat us like they use to." >> pelley: we'll come back to holly in just a moment, but first we want to tell you about the reaction of the brands you saw in the story. earlier this week, we brought holly's findings to asics, wrangler and wal-mart. asics says that it was told they don't do business with monde apparels, so asics is investigating whether the clothes you saw are counterfeit. wrangler told us that monde was approved for use last march by an independent labor group, but after we called the company, wrangler sent its own inspector and has now fired the supplier. wal-mart told us it will investigate, and if unauthorized production or child labor are found, monde will be barred permanently. holly's back from bangladesh. she's in our london newsroom now. holly, for years u.s. manufacturers have been trying to improve conditions in bangladesh. they tell customers that they don't do business with companies that don't follow the rules. how does this still happen? >> well, scott, sometimes american companies give their orders to a supplier, not the factory. or they'll give an order to one factory, and then it gets passed along to another factory. in that case, they don't know where their products are being made. and even if they do know which factory they're using and they inspect it, there can still be problems because the factories are cleaned up ahead of the inspection and workers are coached on what to say. >> pelley: well, this has been eye-opening and we'll have another installment of your investigation tomorrow night on the evening news. holly, thank you. female cadets at west point were secretly taped in the shower. who's accused of doing it? that's next. body wash can with more moisturizers than seven bottles ofing body wash. with ultra moisture your body wash is anything but basic soft, smooth skin with olay. vietnam in 1972. 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>> i was terrified. but i didn't want him to be scared. >> reporter: obviously more scared for him than you were for yourself. >> i was. i was thinking i'll hold on to him. thought, nothing that will take him. >> reporter: what jamie didn't know was her husband matt was racing home. >> i just wanted to be home. you know? i didn't want them to be by themselves or anything. so i just wanted to hurry up and get home. >> reporter: they ran for their next-door neighbors' underground storm shelter but their backyard fence had a door that was jammed. you ripped the door off the fence? >> i didn't know i pulled that hard. it was just adrenaline. and it came off. >> reporter: then you couldn't find the shelter? >> i thought we were wrong. it wasn't there. and so there was a shed standing there where it used to be. i thought maybe it was inside. it turns out that he did build a shed around it. this is where they were at. >> reporter: matt falwell showed us the underground shelter. their home was destroyed like most of their neighborhood. >> i never imagined seeing this when i stepped out. i wouldn't have been able to pick out anything here. i mean -- >> you were thinking, you know, you look around and you're like a house is supposed to be there and it's not. this is supposed to be here and it's not. and everything is just turned to rubble. >> reporter: even today, with your house in shreds, your family is intact. >> that's the thing. we can -- we don't even think about what we rebuild, where we rebuild. it's sad going through the house thinking, oh, i saved there -- oh, i saved this for so long and now it's gone, but who cares? >> reporter: the falwells spent 45 minutes in that shelter but it gave them the chance to rebuild their lives together. mark strassmann, cbs news, moore, oklahoma. >> and that's the "cbs evening news" for tonight. for all of us at cbs news all around the world, good night. od night. captioning sponsored by cbs captioned by media access group at wgbh access.wgbh.org >> your realtime captioner: linda marie macdonald. you're asking us to crystal ball it and we're not going to be able to say -- we're not going to say what we need until we get a plan together. >> facing the financial reality of our super bowl bid. tonight, we ask if the bay area can even afford to host the nation's biggest sporting event. good evening, i'm elizabeth cook. >> i'm allen martin. certainly easy to see the bright side of hosting a super bowl. all the events, the financial windfall. not to mention the pure pride. but is the bay area getting in over its head? kpix 5's phil matier asked santa clara's mayor about the cost of such a large event. phil. >> reporter: that's right. and i got to tell you, santa clara, whether it's the new stadium or hosting the super bowl, they're definitely putting a lot of faith in the 49ers. here's the deal. the super bowl is now a done deal for the bay area. but there's still some questions unanswered. for example, under the terms of the agreement, the bid committee has agreed to cover santa clara for all the police, fire and clean-up costs associated with the big game. and you have a contract for that in writing, right? >> yeah, we do. we do. >> reporter: and do we have an estimated cost on that? >> i don't have the number off the top of my head, so i'd hate to answer to that. >> reporter: do we have a ballpark? >> we have an actual cost number that perfect' looked at based -- that we've looked at based on the events at other similar venues. >> reporter: but today the city said it's too early to say publicly just what that number might be. >> you're asking us to crystal ball it and we're not going to be able to say -- we're not going to say what we need until we get a plan together. >> reporter: and that had some santa clara residents nervous. >> i'm worried about them not being able to pay for it. >> reporter: santa clara says they will be repaid and the committee says they will repay them for the costs. >> that may happen. i don't know. it gets pretty confusing. i'm not an accountant. >> guarantee you our costs