success takes partnership, and only through discipline and trust can we create something greater than ourselves. mufg, we build relationships that build the world. >> and now, "bbc world news america." >> this is "bbc world news america." reporting from washington, i am laura trevelyan. receiving the death penalty for crimes committed during the revolution is gaddafi son. we are gauging reaction and tehray. >> the real power in this land of supreme leader is knowing when it has given it its blessing. laura: the secrets held in bones. researchers reveal details about the first englishman to settle in america more than 400 years ago. ♪ laura: welcome to our viewers on public television in america and around the globe. in libya gaddafi's son was sentenced to death by firing squad. he was convicted of killing protesters and committing war crimes during the revolution four years ago. he is being held by former rebel group that refuses to hand him over. john simpson reports. john: these men have been accused of murder, torture, and theft on a grand scale. there are now waiting for their fate. the judges have spent three years or more going through the evidence. the verdicts are clear-cut. death by shooting for gaddafi's son saif al-islam. huge fines and lesser sentences for others. for were acquitted. the power goes off as the verdict is red. there are constant power cuts. one of the accused has a seizure wrought on by stress. -- brought on our stress. another events his anger at the judges. we were not allowed to film him. this has been a next ordinary and and extorting a -- to an extraordinary try to -- this has been an extraordinary into an extraordinary trial. it will add another question mark to the way the trial is being conducted. the defense lawyers were angry at the harsh sentences. one of them told us that he would appeal. international criminal court has criticized the trial here, but the chief prosecutor insisted that it has been fair. >> the proceedings were opened everyone. john: when i met sarif in his heyday he was quoted by politicians. he was the favorite son of a rich dictator. he was given the suspect doctorate by the london school of economics. at home he was loathed. when he was caught after his father's downfall he was terrified. the people who arrested him chopped off his forefinger. the one that he liked to wag in people's faces in television. he is still in jail. his captors enemies of the tripoli government, have refused to hand them over, and that could save his life. whatever the eventual outcome of the trial in tripoli, most people will feel that libyan justice has been done. john simpson, bbc news. laura: a key member of the obama administration is on capitol hill defend the iranian nuclear deal. the u.s. secretary of state john kerry, strongly answered critics. secretary kerry: this is america's interest. because america is the principal guarantee or of security in the region, and with respect to some of our closest friends, we believe that iran was marching toward a weapon or the capacity to have a weapon, and we have rolled that the act. that is indisputable. that is a fact. laura: as secretary kerry makes that heated defense before congress the eu foreign-policy chief is in enron and sharing the nuclear deal will be implemented. federica mogherini a more grainy and the iranian prime minister opened a new chapter. there is still criticism of the agreement and the region. our chief correspondent reports. >> europe's top diplomat stepped and bright sunshine in bright colors. are you glad to be here? good to be here, she says, but she knows it is a hard road ahead. even her short ride through tehr an takes her past symbols, like this monument, named freedom. first off is the elegant foreign ministry. she spent many hours in talks with the iranian foreign minister to clinch the deal two weeks ago. she has come to his city to ensure that it is implemented. >> it is now time to show that not only we reached a deal, but we are working on the limitation of the deal. >> when it comes to implementation, how worried are you about whether iran can keep its commitments? senior officials have said that some of the iranian red lines have been crossed in this deal . >> when iran promises something, it is a full to its promise. as long as this goes through all of the legal procedures, i have no doubt the deal will be implemented. >> moke at any knows there is strong criticism in the west and in iran. she wants to hear all points of view. she will hear concerns about the deal. there have been threats in the parliament saying that this deal threatens the iranian security. the real power in this land of a supreme leader he has given it his blessing. that is what matters most. most iranians back the deal. i want a deal when it comes to improving their lives. a young population takes more interest in a technological revolution than an iranian one that happened before they were born. there is pride in being iranian. >> i hope they get to know what it around is really like. in the past the image of our country has been abused by ourselves and others. >> every week brings another high-level delegation from europe, all keen to take advantage of the opportunities. it all depends on this deal. that is why supporters are doing everything they can to make it work. bbc news tehran. laura: in other news from around the world a former u.s. navy intelligence office has been granted parole after spying for israel. he will be released after serving 30 years of a life sentence. the israeli government has tried to secure his early relief. the u.s. government has denied -- migrants have attempted to reach britain through the channel in french. the scale of the incident on monday was unprecedented. some were disrupted. an american tourist accused of killing a line in zimbabwe did not know his target was cecil. he relied on professional gods to find an animal and to get the permits. the zimbabwe conservation task force at the american paid $60,000 to shoot the lion with an arrow. an emergency nato meeting has backed turkey's fight against instability on its border with syria and iraq. they have carried out airstrikes in syria and against members of the kurdish oteri group in iraq. the groups expanded to include southern turkey. a brief time ago i discussed it with steven could, a senior fellow at the council of foreign relations. they backed turkey spite against the islamic state, but what do they say about the fight against the pkk? stephen: they were cool against turkey wanting to attack the pkk. turkey's nato partners have warned turkey that it should continue with the negotiations. laura:'s turkey using this fight against the islamic state, this newfound fight, as a cover when it really wants to attack the pkk? stephen:the central difference between nato and turkey is that they have different priorities. where nato, and the united states in particular have been concerned about the islamic state, turkey has been concerned about the reinforcement of kurdish naxalism -- kurdish nationalism. as the kurds in northern syria build an independent canton, and as the kurds in turkey's for electoral gains in parliamentary elections, the turks are concerned about this destabilizing turkey. laura: from washington's point of view, the fight against islamic state is the priority. you have syria and kurds that -- battling the islamic state. are they ignore them if turkey goes after the pkk? stephen:this idea of a safe zone in northern syria. essentially, the united states is giving the go-ahead, though not explicitly, for the turks to attack their most effective partners in the fight against isis in favor of a country that has dithered on laura: the fight against isis. laura:what are the risks? could it be explosive in the region and upset kurds everywhere? stephen:it could be explosive. it will draw attention away from the battle against isis to confronting turkey and turkey's attention . laura: what about the idea of a safe zone? could that be useful and ultimately involve trying to get rid of president assad? stephen:that is something both the u.s. and turkey want to do but it is part of turkey's priorities. turkey said the way to deal with isis is to bring down assad regime. the united states would like to see a sawed fall, but they do not believe that that would resolve the isis problem. the safe stone would draw turkey and the united states into the conflict because the safe stone would have to be defended at some point. laura: you are watching "bbc world news america." still to come, human trafficking continues in nigeria. the victims and the profit from the girls misery. usa today investigation say that copilot error cause the crash of a virgin spacecraft last year during a test flight. >> seeing for the first time, -- seen for the first time, these are the last moments of the virgin lactic spacecraft. it disintegrated in mid air and spread debris across five miles of the california desert. >> the copilot died in the pilot suffered serious injuries. >> investigators confirmed that came down to this handle. the braking system. the copilot pulled it 14 seconds to early. the company making and testing the ship scaled composite did not think it could happen. >> during the design, scale did not consider the possibility the pilot would unlock the tether before 1.4 mach so no safeguards were put into place. i was given access to the headquarters in california. in the simulator, the chief pilot took me through a flight. they was flying the mothership circled here on the day of the accident. >> people were shocked saddened and there was a determination to find out what had happened and why. >> the company says fewer than 30 customers pulled out because of the crash. 700 still want to fly. >> it is what many people -- they have seen other people go to space. now, finally, it is our turn. >> this radical project is already running seven years late. virginia insists it will eventually put ordinary people among the stars. ♪ laura: human trafficking is increasingly a global problem with victims coming from 152 countries according to the u.n.. one third of those trafficked our children. we are highlighting the issue with a special report. we are in nigeria were most come from benin city. our correspondent has been speaking to victims and traffickers. >> it is a place of hidden cruelty. the streets which had a brutal trade in a world for traffickers sorry. -- traffickers thrive. >> some die. >> many people are drawn to this bustling city. it is the launch pad to europe, where the wealth of those who traveled abroad are visible -- is visible. in benin city, it is a trafficking hub. most of the women who end up in europe as prostitutes come from here. this is where the first age of the process began. where recruiters come here to markets and hair salons to look for vick comes before they take them over the mediterranean sea to your -- to europe. most of those do not know they will up on the street as prostitutes. one woman was promised a job as a sales attend it. she wants to warn others about potential dangers, but she is too scared to be identified. >> the person said i'm going to go work in a supermarket as a salesgirl. that is why traveled. when i got to russia, it was really, really hell for me. after weeks of negotiations and under the promise of anonymity a trafficker agreed to speak to us. the traffickers have sophisticated methods. using female recruiters, they send them to women abroad who enslave them as prostitutes. >> sometimes we scout for them. sometimes they look for us. some of them, their parents encourage them. they say, you are here, doing nothing. why don't you go abroad to make money? we get a passport for them. a madam can say we need three or four. at times i get $300 to $500 per person. >> some women are locked in houses in nigeria, in transit to europe or to destination countries where they are put to training. the head of nigeria's antitrafficking agency explains how it works. >> the madams teach these girls the kind of words you have to use to approach her clients. the mode of dressing. and some of the victims say the madams could keep them indoors for two weeks. they're well fed. they are taught social skills. >> there is a strong belief in witchcraft. the traffickers exploit this to keep their victims trapped. >> we take them to see doctors. they make them swear that when they get there, because it is our money that we are using to take them there, that they will pay. the witch doctor will instill fear into them, and tell them that if they don't pay they will die. >> she is been trafficking for five years. we pushed her on why and if she would do it to her own children. she was upset and told us that she stopped. >> i went into it because of the money. i feel bad. i would not allow my children to do that. >> our contact insisted that she still traffics girls. those that make it to the other side arm present into a life of prostitution and slavery. the traffickers demand tens of thousands of pounds before they regain freedom. >> when i got there, the first and they took was my passport. they took my documents and said if i don't do what they ask they would kill me. i said ok. what do you people want? they said, there's nothing like a supermarket or boutique. i'm here to work for them as a prostitute. >> another woman spent five years in prostitution in italy. she severed beatings and rate before she was deported back to nigeria. >> my maddened and tell me how much i would pay her. each time i would go to work she would tell me to pull off my close and would search my body. i paid her 19,000 pounds. even when i'd given her the money, she told me to bring more and. i said, how much do you want me to bring? she said, until i'm satisfied. >> the government is getting serious about fighting trafficking, but the web is so entrenched it is difficult to untangle. the challenges of life in nigeria create the perfect conditions for traffickers to exploit. a few big terms are fortunate to break free and returned home, but the damage done to them is haunting, possibly for the rest of their lives. bbc news, nigeria. laura: horrifying. tomorrow are series on human trafficking continues with a report from the united states where the fbi says child exploitation is at near academic -- near epidemic levels. scientists have identified the remains of four of the earliest leaders of the jamestown settlement. they were found at the same church where pocahontas marry john rolfe -- married john rolfe. they were so poorly preserved it has taken two years to work out who they belong to. dana o'brien has the details. -- jane o'brien has the details. jane: these are the remains of four men now known to be the lost leaders of jamestown. doug owsley led the friends of teen searched for clues in the bones. >> it requires patience and persistence. if you just let them know, they will whisper to you little clues . they will tell their story. jane:most significantly, high traces of letter -- of lead were found. >> you would receive exposure from it in england. from a high status household, you would have greater exposure because it comes from pewter from fancy glazed wares and it leaks into the food delete. jane:robert hunt, america's first anglican minister was wrapped in a shroud. the others had confidence befitting their status. how did you know where they were buried? >> there is a distinctive stain in the soil, and also a distinctive shape to the grave shaft. we found them rot here -- right here, one by one. jane:the discovery is important because they were all among the first settlers. >> they saw the earliest challenges to the colony, saw jamestown through some of its toughest times. it helps save jamestown and english america for posterity. jane:one grave contained a mysterious sealed silver box. its contents revealed by c.t. scan were religious relics, a file that may have contained holy water. rising seawater is threatening the entire jamestown site. >> i think that we are racing against time. not only sea level-wise, but the decay of everything. like iron, we find armor, and we know that there is very little iron left, now. in another 10 years it will probably only be dust. jane:it has taken almost two years to identify the four leaders. teeth, bones, and historical records played a part. there remains could yet yield more information about the people who founded modern america. bbc news, jamestown. laura: so much detail revealed by the bones and that silver box. it is fascinating. that brings today's broadcast to a close. you can find more on our website . you can reach me and the rest of the team on twitter. from all of us here at "bbc world news america" thank you for watching, and please, tune in tomorrow. ♪ >> make sense of international news at bbc.com/news. >> funding of this presentation is made possible by -- the freeman foundation, newman's own foundation -- giving all profits from newman's own to charity and pursuing the common good, kovler foundation -- pursuing solutions for america's neglected needs, and mufg. >> they say the oldest trees bear the sweetest fruit. at mufg, we have believed in nurturing banking relationships for centuries, because strong financial partnerships are best cultivated for the years to come, giving your company the resources and stability to thrive. mufg, we build relationships that build the world. >> "bbc world news" was presented by kcet los angeles. captioning sponsored by newshour productions, llc >> woodruff: good evening. i'm judy woodruff. >> ifill: and i'm gwen ifill. >> woodruff: on the newshour tonight: a spy to be set free-- israeli-american jonathan pollard gets parole after 30 years behind bars in the u.s. >> ifill: then, revisiting the nuclear bomb, 70 years later. the lingering health concerns for a community downwind of america's first test site. >> we were the first people that the atomic bomb was used on. the government came into our backyard and used us as guinea pigs. >> woodruff: plus, the criminals who rule the lawless seas. chasing down the world's most wanted in dangerous waters. >> ifill: all that and more on tonight's pbs newshour.