>> couric: good evening, everyone. the obama administration has been saying there's nothing much new in those field reports from the afghan war, but posting some 76,000 of them on the internet, that's a whole other matter. the military said today the leak may have already cost the lives of american soldiers and their allies. and the f.b.i. has been called in now to help track down whoever gave the documents to the whistleblower web site wicky leaks. national security correspondent david martin has the story. >> reporter: the damage caused by the hemorrhage of classified documents is worse than originally thought. today, pentagon officials in effect accused wikileaks and its source within the u.s. military of murder. >> the truth is, they might already have on their hands the blood of some young soldier or that of an afghan family. >> reporter: in what appears to be an attempt to build a criminal case against julian assange, the head of wikileaks, secretary gates asked the director of the f.b.i. to join the investigation. >> the battlefield consequences of the release of these documents are potentially severe and dangerous for our troops, our allies, and afghan partners. >> reporter: the documents reveal the names of afghans who provided intelligence to the u.s. their lives are now in danger. and their exposure will send a chill through anyone else thinking of helping >> will people whose lives are on the line trust us to keep their identity secret? >> reporter: the documents also provide a road map to the american military's tactics. this, for instance, is a moment-by-moment log of what u.s. troops did after specialist bowe bergdahl was captured by the taliban. the damage could get worse. >> it could be a substantial, additional number of document oodz and we have no idea what their content is, either. >> reporter: add sang is still free to hold press conferences, but bradley manning, the 22-year-old private suspected of providing the documents to wikileaks is being moved from a prison in kuwait to the brig at quantico, virginia, while investigators ready more charges against him. assange has vowed to release 15,000 more documents, but investigators believe manning downlooked liked even more than that. katie. >> couric: and, david, i know in other news, the army released a report today cataloging the stress caused by nine years of war in iraq and afghanistan. what can you tell us about the findings? >> reporter: well, the army's been trying hard to bring down its suicide rate, but the opening paragraph of this report is just brutally honest. it says, "we are often more dangerous to ourselves than the enemy. suicide is now the third leading cause of death after combat and accidents. 160 suicide last year plus 1700 attempted suicides. 146 other deaths were due to murder, drug overdoalses and just plain risky behavior, and misdemeanors have been increasing at the rate of 5,000 per year. >> couric: all right, david martin at the pentagon. david, thank you for that as well. the death of an american in uniform no matter what the circumstances is always a tragedy. now the department of veterans affairs and the state of new york are investigating whether life insurance companies are taking advantage of grieving families when they're most vulnerable. this is in response to a story we brought last night based on a six-month investigation by "bloomberg market's" magazine. it's being called the life insurance industry's dirty little secret, revelationslet nation's second-largest insurer was profiting from the death benefits of fallen soldiers. >> until today, i actually believed that the families of our fallen heroes got a check for the follow amount of their benefit. so this came as news to me. >> it's sad. >> couric: survivors like cindy lohman, whose son, ryan, was killed in afghanistan, believed they would be getting checks, too. instead, they were told their death benefits were being placed in a secure, interest-bearing account but the funds are actually held in the companyo own general corporate account allowing prudential to earn the lion's share of the interest for itself. >> i was stunned to realize that i had been duped. >> couric: in 2008, when cindy lohman's statement said she was earning less than 1% interest on her alliance account, public records show prudential was earning almost 5% on its corporate account. >> what i read about it and saw how despicable it was, i, frankly, thought it was treasonous. >> reporter: pennsylvania congressman patrick murphy is an iraq war veteran himself and says he's looking into possible legislation to permanently end the practice of so-called retained asset accounts. >> i'm not sure if it's criminal or not, but what i know is it's wrong and it should stop and if they don't stop it themselves, we're going top to stop it for them. >> couric: new york-based met life, the country's largest life insurer is one of over 120 insurance firms hold something $28 billion will be in retained asset accounts. today new york city attorney general andrew cuomo launched his own consumer fraud investigation serving subpoenas to met life and seven more life insurance providers. >> i am so angry at the insurance companies... >> couric: meanwhile the writer of the "bloomberg market's" magazine investigation said his in box was flooded with e-mails today from policyholders saying they're reeling from a broken trust. >> they sound like they feel betrayed that they didn't have more information about how these policies worked and they had to learn about it from reading a magazine article. >> couric: in a statement yesterday, two cbs news prudential said: and late today, prudential told us it's in talks now with the department of veterans affairs to address the concerns that have now been raised. now, another story about the treatment of america's fallen heroes at perhaps the most hallowed burial ground in the nation, arlington national cemetery. there's now evidence of a shocking number of mismarked graves. today, we learned it wasn't just a few hundred. it could be more than 6,000. and as chip reid reports, the man once in charge of the cemetery was asked to explain himself before congress. >> i accept full responsibility for all of my actions. >> reporter: metz, who spent the the last 16 years overseeing arlington cemetery said the buck stops with him but said he only discoverredly the problem recently. >> the notion that you would come in here and act like you didn't know about it until a monsago is offensive. you did know about it and you did nothing. >> reporter: a respect by mccaskil's submity said metzler knew about the problem five years ago. >> people who had worked for you had had enough and they blew the whistle. >> reporter: so how could such bureaucratic bumbling consider on such sacred ground? >> anything done by hand even 140-plus years there have to be errors somewhere. >> they spent $8 million trying to exoortize the records, an effort that ended in failure. >> this is not complicated. it's called keeping track of who you bury where. >> reporter: mccaskil calls this a case of heartbreaking incompetence, but the new team in charge here of arlington says eventually all the discrepancies will be corrected, katie. >> couric: chip reid at arlington national cemetery tonight. thank you, chip. in other news, arizona today appealed a federal judge's order that blocked the most controversial parts of the state's new immigration law, including a provision that called for police to check a person's immigration status while enforcing other laws. the rest of the law took effect today. in phoenix hbdz protested, claiming the original law goes too far in targeting illegal aliens. at least 32 were arrested after block the doors at the maricopa county jail. in washington, he was once one of the most powerful men in congress. tonight, democrat charles rangel is fighting for his political life after house investigators laid out an array of ethics charges against him. from capitol hill, here's sharyl attkisson. >> reporter: rangel is knowing for saying he hasn't had a bad day since he survived battle in the korean war. maybe not anymore. >> today i have to reassess that statement. >statement. >> count two conduct in violation. count nine, conduct in violation. count 12, conduct in violation. >> reporter: at the heart of the 13 counts is what critics have called rangel's monument to me, a presidential library-like project called the rangel center add city college in new york. it was the subject of a cbs news investigation in 2007. rangel is charged with using public resources and congressional letterhead to ask for big donations for the rangel center. he solicited companies that had businesses before the tax committees he led at the time. goldman sachs, wachovia, and dozens more. rangel asked for $30 million from verizon and new york life, $10 million from insurance giant aig. he's also charged with directing taxpayer earmarkes to the center, failing to disclose income, checking accounts, stocks, and property, and improperly used rent-subsidized apartments for his campaign committees. the stage is now set for the kind of spectacle that many of rangel's college cleegs had hoped to avoid. the last ethics trial was in 2002. james trafficant had been convicted of bribery and corruption. his defense-- point fingers at colleagues who had been found guilty of having sex with young pages bull were not expelled. >> is sex with a minor, 17 years old, a rape? >> well, at this point, mr. chairman-- >> and a felony one, sir? >> reporter: rangel denies any wrongdoing. we're told to expect his trial to begin in september. katie. >> couric: sharyl attkisson, thanks very much, sharyl. in other news, shirley sherrod spoke out today at a journalism convention today in san diego. she said she hasn't heard a word yet from the blogger whose video clip led to her ouster from the department of agriculture but she made it clear-- he'll soon be hearing from her. >> i will definitely do it. i will definitely sue, yes. >> reporter: sherrod told the crowd blogger andrew breitbart has yet to apologize for posting an edited clipave speech she made to the naacp that made her sound racist. >> here i was faced with that when i had a white person save their land. >> reporter: and she vowed to pursue a lawsuit against him. this morning at an urban league event, president obama accepted responsibility for the rush to judgment over what he called a bogus controversy that prompted agriculture secretary tom vilsack to ask for sherrod's resignation. >> now, many are to blame for the reaction and over-reaction that followed these comment, including my own administration. >> couric: and his administration has been trying to woo sherrod back with an offer to return to a new job at the u.s.d.a. as deputy director of advocacy and outreach. >> they've been calling me since 4:00 this morning ( laughter ) >> couric: but for now, she says she isn't ready to answer that call. now, to the gulf. on day 101 the government's point man, admiral thad allen said the next attempt to plug the well, first through a new cap and then a relief well, could begin this weekend. meanwhile, a spill in michigan's kalamazoo river is worse than first thought. the e.p.a. now says more than a million gallons of oil leaked from a broken pipe. it's killed fish and left birds covered in oil. today residents of 50 homes were advised to leave until the impact can be investigating. in montana, a deadly attack by grizzly bears. a mother bear and two cubs were captured today outside yellowstone national park. it's believed they're behind a rampage that left one camper dead and two injured. cbs's priya david spoke with one of the survivors. >> reporter: sheer, absolute terror. >> reporter: the attack came without warning in the pitch dark before dawn. deb freele awoke to find her arm pinned in the jaws of a 300-pound grizzly bar. >> just shaking me like a rag doll and that's when i started to hear bones cracking. >> reporter: about 4:00 a.m. tuesday morning, montana wildlife authorities say a female bear tore through tents and attacked three people near yosemite. >> i thought what am i going to do now? and i said you gotta play dead and i went limp, totally limp, very quiet. it helped it held me in its teeth for a little while and dropped me and walked away. >> reporter: the bear also attacked a young man who escaped with lesser injuries but killed a michigan man after dragging him from his tent. what's bothering you? >> that somebody else died and it could have been me and it wasn't. >> reporter: fatal bear attacks are rare. in this area, there have been four killings by grizzlies in the past 30 years. montana wildlife officers said today they believe they've captured the bear responsible for yesterday morning's attacks plus two of her cubs. now, they're waiting for d.n.a. evidence to come back to confirm these are the right animals and if so, they may very well be put down. >> if the mother is pursuing people, cubs are going to learn to pursue people. >> reporter: freele planned to camp her way back to ontario, canada, but now just wants to get home quickly and be with the family she never thought she'd see again. >> couric: and still ahead on the cbs evening news, reunited-- an american soldier and the dog that saved his life in afghanistan. but up next, calcium supplements, do the risks outweigh the benefits? >> couric: calcium supplements are a good way to keep your bones strong, but there's new concern tonight they could lead to an increased risk for heart attack. dr. jon lapook has the results of a new study. >> reporter: lisa has two problems-- her bone bones are thinning and her cholesterol is high. she's taking calcium but now she's worried what may help her bones may hurt her heart. >> i think why this study concerns me is because of all the different factors i represent, and at some point, we're going to have to make a decision as i get older. >> reporter: it's a decision faced by millions. new research released tonight looked at 11 studies involving almost 12,000 patients. those receiving calcium supplements had about a 30% increase in heart attacks. >> i think it's important for us to look at this study and rethink our practice. we shouldn't just recommend supplementation for all of our patients. >> reporter: more study is definitely needed but now, it looks like it's better to get your calcium through food which doesn't seem to cause this type of heart problem. katie. >> couric: so is this a real conundrum, jon, for doctors? what are they going to tell their patients about this? >> reporter: it is a conundrum and this may represent a real sea change. i know i have tons of patients, especially women after the age of 50, taking calcium supplements and now i'm going to say let's see if we can get it from food, not just dairy, but other things-- >> couric: like sardines. >> figs, almonds, broccoli, soybeans. we're going to have a more complete list up on our web site but the bottom line here is one size doesn't fit all and doctors have to rethink what they were just automatically doing. >> couric: my doctor told me to get it from food this morning, in fact. >> reporter: and your doctor was correct >> couric: when winston churchill coined the phrase iron curtain he was speaking with gold plated teeth and his teeth sold today at awx for $23,000. they were designed so they wouldn't alter his voice, especially his famous lisp. that way britain and the world would recognize him on the radio during the darkest days of world war ii. >> we shall never surrender. >> couric: in other news, it's supermarket to the rescue, at least this classic comic book that introduced superman to the world back in 1938. a family, they want to remain anonymous, say they were about to lose their home to foreclosure when they found it in their basement. it was left there by a late relative and may be worth $350,000. superman saves the day and maybe the house. >> i think it is sort of ironic that something of incredible value was in their house, and it could actually help them keep their house. >> couric: the family will reportedly get to keep their home while they wait to put the comic book up for sale next month. and coming up next, superman didn't save this soldier's life in afghanistan. a super dog did. opinion >> couric: finally tonight, there's nothing quite like a friendship forged in heat of battle, and when old war buddies are reunited, well, here's national correspondent jeff glower. >> reporter: when georgia national guard guardsman chris duke was serving in afghanistan, he may friend with the locals, stray dogs sasha, target, and rufus. >> you know, a love of us used the three of them as kind of an escape, you know, whenever you're homesick. >> reporter: but they did much more than keep him company. >> it's my firm belief i probably would not be here today if not for him. >> reporter: on a february night, a suicide bomber tried to get into duke's barracking but the dogs began barking and biting the intruder and blew himself up before he could kill 50 soldiers inside. sasha was severely injured and had to be put down. but rufus and target were both nursed back to health. duke returned home a month later. the dogs had tow stay behind. >> i was really worried, the fact that the next unit may come in and not want them there. >> reporter: as another soldier kept an eye on them, duke wrote a letter to a veterans assistance group called "hope for the warriors." have you ever gotten a request like this before? >> no. this was going to mean a lot to him and so whatever we needed to do to get this wish done. >> reporter: other organizations heard about the story, too. and a facebook page went up, which in less than three months, raised $21,000, enough for the dogs to leave afghanistan. this week, rufus and target finally arrived in the u.s. >> hi, puppies! >> reporter: today, in atlanta, they were reunited for the first time with duke and his wife. >> hi, buddy! i was pretty much in disbelief all the way up to the moment i saw them. >> reporter: target will live in arizona with another soldier. rufus will stay with the dukes. >> i think i'm going to have him for the rest of his life and, man, it's exciting. >> reporter: exciting because he knows he wouldn't be here if it wasn't for the dogs, and now they wouldn't be here if it wasn't for duke. jeff glor, cbs news, atlanta. >> couric: and that is the cbs evening news for tonight. i'm katie couric. thank you for watching. i'll see you back here tomorrow. good night. captioning sponsored by cbs captioned by media access group at wgbh access.wgbh.org and we begin tonight with breaking news that we have been following for you all afternoon. frames are at a standstill on metro and mark after a wire fell onto a track in silver springs. we have a live look with the latest. gary, you have been painting the picture through all of this. now the rain is coming down. what about the passengers on the stranded train? >> reporter: well, the news is better for them right now than for the pepco workers who need to stand in the rain to deal with high power lines and make sure they don't get killed in the process. for now, we're a little closer to the tracks where the power lines and the trees came down late on the tracks late this afternoon, causing an inbound redline train with 41 passengers from proceeding from forest bend to silver springs. it stop just here at 16th street. the passengere