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>> a gunman wearing an afghan army uniform has killed two nato troops in the south of the country. president obama calls for chinese support in the fight against nuclear weapons. a leading aid agency says niger needs millions of dollars, otherwise its food crisis could become catastrophic. welcome to "bbc world news." i'm geeta guru-murthy. also in this program -- titanic director james cameron resurfaces from the deep after diving to the bottom of the ocean. and tiger's back in the hunt. woods secures his first pga tour victory in over two years. >> in afghanistan, a gunman wearing an afghan army uniform has killed two nato troops in the south of the country. the attack appears to be the

latest in a string of shootings in which afghan security forces have turned on their international colleagues. an official in southern afghanistan has said the shooting happened inside the main nato base. the bbc's reporter is in cab and you will gave me the latest on the shootings. >> we understand from officials that an individual wearing a uniform opened fire, killing two nato service members. in a statement, they said that the gunman was killed as well by coalition forces. but afghan officials in helmand are now confirming to the bbc that the soldier was a member of the afghan national army, and he's killed two service members from nato. >> it's been a difficult time in afghanistan in recent days and weeks. was this connected to recent tensions or just one of?

>> well, one thing the national security forces have been having a huge problem with, and that is the issue of rowing soldiers and taliban infiltration. we have seen similar incidents at least for the last year and a half where members of the police and army have turned their guns on their coalition partners. the afghan government has simply failed to come up with a strategy to prevent that. an afghan officials at this stage are saying that they're investigating the matter, so we really don't know if this was connect to the events the last few weeks. >> president obama has been meeting with chinese leader on the sidelines of a major nuclear security summit in south korea. the u.s. president has said the two countries have a joint interest in nuclear nonproliferation. lucy williamson has the latest.

>> president, father, commander in chief, and now an honor graduate too. at korea's hankuk university of foreign studies, mr. obama came in all four of his roles with one core message -- america, he said, had more nuclear weapons than it needed and was committed to leading by example. >> i say this as president of the only nation ever to use nuclear weapons. i say it as a commander in chief who knows that our nuclear codes are never far from my sight. most of all, i say it it as a father who wants my two young daughters to grow up in a world where everything they know and love can be instantly wiped out . >> speaking directly to north korea's leaders in pyongyang, he said nuclear weapons had not delivered the security, dignity, or respect north korea sought, but had undermined it. looking across the demilitarized zone on sunday, his first glimpse inside the

closed communist state. president obama said he was struck by the stark differences between the two koreas. north korea isn't coming to the summit here this week. it's not even on the official agenda. this meeting is about preventing nuclear material from falling into the hands of terrorist groups, not about nuclear disarmament. but north korea is just an hour's drive away from here, and president obama's speech and his schedule show just how much part of the discussion it is. lucy williamson, bbc news, seoul. >> i asked lucy for more on that conference and asked what exactly president obama and the chinese leader have been talking about. >> president obama was due to discuss a number of issues with president hu. key among them, north korea's planned rocket launch next month and the wider issue of north korea's nuclear program. and we got a bit of a hint behalf president obama may be saying to his chinese counter

part from his press conference on sunday, where the american president says that china's approach to north korea so far wasn't working and urged him to get much tougher. >> of course, there's been much discussion on also the question of iran in recent months. is that likely to be also part of the discussion? >> that's something else we're told will be part of the discussion between the two presidents. china is obviously a member of the security council, has influence on what kind of sanctions may be applied to iran if it continued its tensions with the united states. but also, china is a major energy importer, and in previous situations, has sometimes decided its energy needs are a part of that decision that it needs to make. so i think that's going to be something else. the two presidents have a lot of differences about how they perceive iran's nuclear program

in terms of whether they perceive it to be a threat or how much of a threat. they are pretty far apart on that issue. but on the issue of north korea, iran has already intimated that it is trying to get tougher with pyongyang and said it has limited political influence over north korea, but is doing more to try to persuade north korea to fall in line with the international community. >> lucy williamson. the german chancellor has told the bbc it would be a huge political mistake if greece was to leave the eurozone. in an exclusive interview, angela merkel said germany would do everything it can to hold it together. >> greece has explained that it wants to remain in the euro. it has major weaknesses but is trying to overcome them, be them in the administration or the competitiveness of their business community, it's going to be a long and hardous road. we've taken the decision to be

in a currency union. this is not only a monetary decision, it's a political one. it would be catastrophic if we were to say to one of those who have decided to be with us we no longer want you. incidentally, the treaties don't allow for that anyway. people all over the world would ask, who will be next? the euro area would be incredibly weakened. the export nation, germany in particular, benefits from the euro. it would be a huge political mistake to allow greece to leave. that's why we will be clear with greece. we will say, if we want to be part of a common currency, you have to do your homework. but at the same time, we will always support you. >> angela merkel there. aaron, there's a new business confidence today. is it not going to germany?

>> this is a very closely watched survey of german business confidence. i have to say, the number came through today. it's risen. it's the fifth month in a row where german business -- confidence has increased, if you will. but here's the problem. twfs an increase more than economists were expecting, but only a slight increase. even the president of the e.f.o. institute says there's a note of caution, because going ahead, there's no doubt germany, the power house that we always talk about, is losing momentum. it is not immune from the ripple effects of the eurozone crisis. indeed, if you just look at the growth numbers, last year, 2011, germany grew by 3%, solid, healthy growth this. year they're only growth growth for the whole year of .7%. angela merkel talking about it would be a catastrophic and they wouldn't allow greece to exit the euro. going forward, if sentiment and the economy in germany starts wavering, if you will, then it might be hard pressed to

continue to get german toss cough up money to bail out the peripheral economies. >> another economic driver globally, china. >> very interesting. we're talking about two. world's biggest exporters. just talked about germany, china, we started making notes of this last week, where we're starting to see china also, its economy, losing momentum, and the c.c.b., it's the second largest bank, second largest bank in the world by market capitalization, the second largest lender in the world. it may good, healthy profits during last year, 25%. they're up 25%, but bad loans are quite heavy on their books, and they're starting to see a slowdown from the manufacturing side of things, and, of course, worries about the real estate bubble. but look, i'll have a lot more on the world business report in about 15 minutes or so. >> the specter of familiar i am is once again casting its shadow over west africa with the u.n. and international aid agencies warning of a looming food crisis after successive

poor harvests. niger is particularly at risk. our correspondent, andrew harding, reports. >> well, this is one way to try to fight malnutrition and to push back the sands of the sahara. we're on an ar rid plain in the center of niger, and as you can see, there are hundreds of women here, piling stones and rocks on to these banks. these are dishes they've dug to catch the rain water that falls very rarely here, the idea being that once the rain has been trapped, they can bring these fields back to life, plant their crops and so on. that's in the longer term. in the shorter term, the women are being paid by the united nations $2 a day, or the equivalent in food, for their time and labor. that allows them and their families to have enough wheat during the coming months, the hungry period that is just beginning here in niger between

harvest. last year's harvest was very poor. there's insecurity, high food prices, so the extra cash is badly needed. it will hopefully prevent a famine breaking out here in the niger. >> the pope is moving on to visit cuba after ending his stay in mexico by giving an outdoor mass to 300,000 people. his visit to communist cuba is being seen as a chance for the church to revive the flagging faith of the people and perhaps increase its influence. the bbc's reporter reports. >> this is santiago, the cradle of cuba's revolution. it's the first stop on this communist-run island for pope benedict. that's because it's also home to the most important catholic shrine. cubans flock to our lady of charity to help with everything, from freeing political prisoners to success in sports. all that despite four decades of statism.

the basilica has been spruced up for the pope with money from the church abroad. "we've been working 24 hours a day, but it's an honor to be involved." the pope is visiting the shrine and the anniversary of the patron saints of cuba. the people here have great expectations. the church hopes this will boost his appeal. only a fraction of cubans regularly go to mass, though it is possible to be catholic and communist here. >> the pope will reinforce the church and strengthen our pastoral work for this year, and i think he will bring a message of hope to our people. >> in a country that's poor and politically isolated, people do think the pope can help with almost everything. let's see if he brings us prosperity, this teacher tells

me, that's what we hope for, and friendship, not just with america, but with the world. the workers have been here preparing revolution square for the pope for weeks. he's already caused a controversy by saying communism has failed. but here, he'll be saying mass watched over by an image of fidel castro. >> you're watching "bbc world news." coming up -- pining for a lost emperor, why some in france are drumming up support for napoleon bone apart. -- bonapart. the winner of senegal's election, macky sall, says his victory marks a new era. this is soon after his rival, the current president admitted defeat and thousands of people took to the streets to celebrate. >> after a violent campaign, jubilation.

these are the supporters of the man who will now lead senegal, macky sall. >> i'm very happy, very happy. macky is young, very polite, courteous, and really, he deserves this. everybody was hoping he'd win. >> and this is the man he beat, his former political mentor, abdoulaye wade, who changed the constitution to try to secure a third term in office. his attempts to cling to power sparked scenes like this, upsetting the tranquility in west africa's most stable democracy. it was at times a bitter campaign. this man, a musician, wanted to run, but was disqualified by five constitutional judges. so who is macky sall? he was born to a modest family. his father, a civil servant. his mother, a nut seller. he was partly educated in france and held a number of

ministerial posts under his predecessor, including that of prime minister. now he has many tasks on his hand. among them, the food crisis gripping the region. but in the capital, where once there was violence, people are seeing a new era, surely a sense of optimism senegal's new leader will want to preserve. >> much more, of course, at the website, bbc.com/news. the latest on all our stories and lots of background added. >> this is "bbc world news." i'm geeta guru-murthy. the headlines for you -- a rogue afghan army soldier kills two nato troops at a base in the south of the country. president obama begins talks with his chinese counter part to discuss their joint interest in addressing iran and north korea's juke lawyer agenda.

the hollywood director, james cameron, has become the first person in more than half a sent troy reach the deepest -- more than half a century to reach the deepest place of the earth. he was in a specially designed sub radio mean. he tweeted, "hitting bottom never felt so good." he spent almost three hours filming and exploring the deaths of the mariana trench in the pacific. his first the first solo dive to reach the bottom. our correspondent joins us from guam, the nearest place to the mariana trench. she gave us the latest. >> right now, at the moment, about 300 kilometers out to sea, the director is celebrating, having made this deepest dive to the deepest place on the planet. he's been waiting for days to go out there, but the weather's been atrocious. but they had a clear stretch today, and he just went for it.

his words before he went down, "release, release, release" t. took him 2 1/2 hours to descend to the bottom. he sliced through the water like a torpedo. he had a few hours to rome around and see what was down there, and then straight back up to the surface. that's where he is now, celebrating his dive. >> when you were telling us about this a few days ago, it looked and sounded extraordinary and quite terrifying. but he's come back safely. was he surprised by what he saw? >> well, we haven't been able to speak to him just yet, but some of the creatures he might have seen down there, there are these rare shrimp creatures that go grow up to a foot long, and they swarm in huge numbers at the bottom. jellyfish, the interesting thing about it, when i spoke to him a few days before the dive, while he was making his final preparations, he said he was really interested in filming the life that existed down there. the ocean, the deep ocean, is

so little explored, he probably has seen some new species. >> and it is, of course, pitch black and freezing cold, and there were great risks, weren't there? >> yeah, that's right. i mean, it's not very comfortable. he spent hours under the water curled up, unable to stretch his arms or his legs. if the sub had been knocked on the way down, it could have imploded, he would have been gone in seconds. if the electric failed in the sub, that didn't happen, and he's back up safely. he doesn't want this to be a one-off dive. he wants to go back down again. >> there is a news conference scheduled for later today. we will bring you that, of course. now, a stage production isn't normally considered a success if the cast and crew outnumber the audience, but that really of thumb went by in the north of england. around 1,500 people were involved in a production of the

2012 mystery plays, and the cast has nearly 600 names. our correspondent reports from york, where the biblical play forms part of a tradition dating back 700 years. >> in the beginning, god created the heavens and the earth. >> the mystery plays are a tradition that goes back more than 700 years. york's guild, who closely guarded the secrets or mysteries of their various crafts, performed "the bible." but this year, it's going to be rather different. walk down any street, and you're almost certain to bump into someone who has suddenly gone a bit biblical. >> i think that was a great

partner. >> the cast list is approaching 600. however, mary must be a big role. >> well, i'd like to think so. >> she's the an old mary, not an a young mary. >> sometimes she doesn't get a lot of mention. >> she ends up in the new testament. >> i auditioned and got the part of the angel gabriel, so it's great we're working together. >> she's not starstruck, is she? >> not at all. >> there are a lot of people in the bible, but the characters, the actors, it's only the beginning. there are hundreds more making stuff like this.

>> how many cast i'ms? >> about 800 to 1,000 costumes. >> you're doing 1,000 costumes? >> 1,000 costumes, yes. >> the setting for the main performance of the mystery plays is on a stage built in the row mains. >> we kind of sit from this side. >> this celebratory performance for an olympic year has gotten rather large. >> i mean, we'll be close to 1,500 members of the community involved in the production. >> 1,500 people? >> yes, i know. when you say it like that, it makes me slightly shudder, cold sweats and things. >> of course, many of the volunteers old hands who have grown up with the plays. the scale may be greater, but there's no mystery to the story. when it starts with these two, you know how it's going to end. >> now, let's catch up with all the sport. katie is here. tiger has finally ended his pga title drought. >> yes, he has, timely return

to form as well with golf's first major just around the corner. yes, tiger woods has won his first pga tour event in over two years. the former world number one secured victory by five shots at the arnold palmer invitational in florida. woods finished on 14 under par, five shots clear of mcdowell. there's been 72 winners on the pga tour since he last produced a win, and it was the 98th victory of his career, just up to six in the world rankings, a timely boost for a fifth masters title at augusta next week. but he isn't getting too carried away. >> well, it's not like winning a major championship or anything, but it certainly feels really good. it was nice to win here with arnold's involvement in the tournament. i've been making steps in the right direction. it just behind shown up for all four days yet.

>> on to tennis now, and rafa nadal's quest for his first title this year is going to plan in miami. the world's number two mate light work of his third-round opponent. he breezed through the first set 6-2. at times he produced some blistering play. he's made the final at the miami mastest three times, but surprisingly, never won the event. the spaniards continue to dominate from the back of the court and took the second set 6-2 to set up a tie with japan nishikori. and that's all sport four now. back to you. >> thanks very much indeed. if you're looking for something a little different from a theme park, france might have the answer. they're planning on one base on one of europe's greatest historical figures, napoleon. >> perfectly the technique. in a field in northeast france,

these enthusiasts are in training for a reenactment of one of these battles. the guns, the clothes, the drill all straight out of the history books. the attention to detail, a telling tribute to the man they've chosen as their hero. this has proved highly enduring, which explains why there's such enthusiasm now for this napoleon theme park. for now, it's only a plan. but it's perfectly serious. build the park here, scene of one of napoleon's last victories in 1814. the mayor wants the first made in 2014, the 200th anniversary. >> if done properly, not just a new disneyland, education as well as fun. and usefully, the park also has the backing of this man, current head of the bonaparte

family. >> people come and through entertainment. this is entertainment, you know, doing something different and working so, well, they will know a bit more about napoleon during this time. i think it's good. >> one of the highlights of the tourist season is this -- the coach that napoleon rode in at the battle of waterloo, that and the hat and coat he was wearing. the allure lives on, two centuries after his final defeat, the emperor strikes back. hugh schofield, bbc news, paris. >> now, much more, of course, at the website, bbc.com/news. the rate latest from afghanistan, a gunman wearing an afghan army uniform has killed two nato troops in the south of the country. this is "bbc world news."

>> make sense of international news at bbc.com/news. >> funding was made possible by the freeman foundation of new york, stowe, vermont, and honolulu. newman's own foundation. and union bank. >> at union bank, our relationship managers work hard to understand the industry you operate in, working to nurture new ventures and help provide capital for key strategic decisions. we over expertise and tailored solutions in a wide range of industries. what can we do for you? >> bbc world news was presented

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