welcome back to "newsline." i'm kanako sachno. north korea state-run media has broadcast a video showing last sunday's rocket launch. the broadcast says it was carrying a satellite. it's widely believed the country was testing a long-range ballistic missile. korean central television aired the video on thursday. it shows a three-stage rocket rising into the sky.

the rocket bears a korean word, the name of the alleged satellite. observers say north korea's leaders likely had two motives for showing the video. they wanted to hail the launch as a historic success, and they wanted to dissuade the u.n. security council from adopting new sanctions. south korean leaders are imposing sanctions on the north because of the rocket launch and an earlier nuclear test. they said they would halt a business complex the koreans run together. now south korean businesses are pulling out. the keson complex lies in the north. people who run south korean firms there have been trucking out their equipment. the complex opened 12 years ago as a symbol of cooperation. this is the first time the south has halted operations. the industrial complex has enabled north korea to earn foreign currency. still officials in pyongyang say

they'll shut it down altogether. the north koreans say they'll put the zone under military control. they called the south's shutdown of operations a declaration of war. they vowed to evict all south koreans from the complex and freeze south korean assets there. the officials also said they'd closed cross-border communication lines in the truce village. u.s. leaders are also taking a tough stand against north korea. members of the senate voted unanimously to tighten sanctions. the legislation targets people who help north korea develop weapons of mass destruction, carry out human rights abuses, or conduct cyber attacks. it requires the u.s. government to freeze the assets of people or companies involved and ban their entry into the u.s. the legislation demands sanctions on individuals and firms found to have sold north korea software or metals that could be used in nuclear or missile development.

authorities in taiwan believe shoddy construction caused a condominium to collapse when an earthquake struck the island last week, killing dozens of people. they've learned the building had less than half the required reinforcing steel in some parts of its structure. the authorities have confirmed 61 deaths in the jolt that hit the southern city of tainan on saturday. about 60 people are believed to be trapped in the rubble. rescuers are using heavy construction equipment in a race against the clock to find more survivors. taiwanese prosecutors have detained three people, including the former head of a local construction firm and two architects on suspicion of professional negligence and other charges. local media report the men are denying the charges.

german media say tuesday's train accident in the southern state of bavaria was caused by human error. two trains collided head-on, on a single-track stretch. police say 10 people were killed and 81 injured. an automatic train stopping system at the site failed to work, though it showed no irregulaties durg insptions la week. translar: we'renalyzing the blacboxes revered from e train determi what haened tecically a the use of t acciden >> local media have quoted investigators as saying the person in charge of monitoring train operations at a signal station switched off the automatic stopping system and let through a train that was running behind schedule. authorities have not commented on the reports. the world's nuclear

authority has waded into the fight against the zika virus. it's organizing a meeting of expert to discuss using radiation to combat the mosquito-borne disease. the international atomic energy agency wednesday opened to reporters a facility outside vienna, austria, that's researching ways to use nuclear techniques to sterilize male mosquitos. the method involves exposing mosquito larvae to radiation to make them impotent. then they're released en masse into the wild where they mate with females, which don't produce offspring. the procedure has previously proven effective in controlling fruitfly populations. >> it's an absolutely clean, safe, biosecure, and environment friendly technology. >> one drawback is the number of sterile male mosquitos released must be more than ten times the local population of wild ones. the iaea will hold a two-day meeting of experts in brazil later this month to exchange

opinions on launching the program in nations hit by zika virus outbreaks. suicide bombers have struck a refugee camp in nigeria. they killed at least 58 people and wounded many more. their attack bore the hallmarks of the islamic militant group boko haram. the camp held people who fled boko haram's insurgency. two women went into the crowd and blew themselves up. they'd reportedly disguised themselves as refugees. analysts suggest boko haram launched the attack as revenge for military offenses. the group has launched a string of attacks in nigeria and neighboring countries. it abducts women and forces them to carry out suicide bombings. a woman who would have been a third attacker at the refugee camp surrendered to authorities. she's quoted as saying she didn't blow herself up because her family was in the camp. five years ago today, egyptian president hosni mubarak was forced to step down in the midst of massive demonstrations.

looking back, some say the rights they demanded remain far out of reach. >> reporter: these are egyptian citizens who have recently disappeared. some are activists. others are journalists. this human rights organization has been investigating their cases. they've long suspected that the government is responsible. but it was only last month that the minister of interior finally admitted that the 114 people out of nearly 200 missing are in detention. they' . >> translator: it's definitely a human rights violation to detain someone for one year or two years without giving any information about it to his or her family or lawyer.

>> reporter: maha has been looking for her husband for two years. shihata is her lawyer. the wife says he strongly believed in democracy and participated in the arab spring uprising. maha says he didn't have anything to do with extremism, let alone terrorism. she recently received a document from the government saying shihata is living overseas. but maha suspects he's detained somewhere in egypt. she attended a gathering of her husband's supporters. >> translator: in the revolution five years ago, we demanded bread, freedom, and social equality. but now we suffer from a lack of freedom.

>> reporter: after three years of troubles, el sisi took power in 2014 and he vowed to fight terrorists. but terror attacks have occurred even among government supporters. some questions the government's ability to maintain peace. he says because the chaos heavily damaged the tourism industry. he founded a sports gym and he held out hope things would be better under the current regime. but late last month, another terror attack took place, killing ten people. >> translator: i am full of disappointment. now everyone thinks it ll take a long time for the country to stabilize.

>> reporter: the people who fought for democracy and those who back the return of military leadership must now fear uncertainty about the future. the head of the u.s. federal reserve has given a downbeat assessment of the global economy. janet yellen said china's economic slowdown, as well as declines in crude oil and stock prices, makes the future uncertain. >> foreign economic developments in particular pose risks to u.s. economic growth. these developments, if they prove persistent, could weigh on the outlook for economic activity in the labor market. >> yellen said fed policymakers will review the interest rate policy if necessary. she said they'll regularly reassess what federal funds rate

is necessary to hit and maintain full employment and 2% inflation. yellen said the fed believes economic conditions will evolve in a manner that will warrant only gradual increases in the rate. fed policymakers will discuss whether to raise the rate's target range at their next meeting, scheduled for mid-march. yellen's remarks sent the yen soaring against the dollar. it touched the 110 yen range in london for the first time in 15 months. investors worried about the u.s. and global economies are turning to the yen as a relatively safe asset. stock markets closed lower across asia. in hong kong the benchmark hang seng index was down 3.8%. south korea's key index fell 2.9%. singapore's fell 1.7%. one of japan's biggest drink companies said it's acquired the rights to buy some

major european beer brands in a deal worth nearly $3 billion. asahi group holdings has been looking for ways to expand its business overseas. asahi said it's made a final binding offer to buy brands including peroni, grolsch, opened by anheuser-busch, the world's largest brewing company. the deal is contingent on merging with its biggest competitor, britain's sab miller. the two companies reached agreement to do that last year, and they're looking to sell off brands to ease concerns of regulators. asahi has been slow to expand. overseas sales account for just 14% of its revenue. u.s. transport authorities have made a decision which could pave the way for cars that until now have been the stuff of science fiction. the ange could see google's lf-drivi system the driver the u. nationahighway traffic fety admistratio notifi the i.tgiant ofhe detas. if auman occant can' erate thvehicle,he drive

could be consired not o but whatever is drivin liforniaroposed aft rule last dember. they say all self-driving ca need to ve a steing whee and a licensed driver. china's economy relies heavily on migrant workers. many bring their children with them. urban areas are now temporary homes for more than 40 million of these uprooted kids. many can't attend regular schools and as nhk world explains, that's leading some to get involved in destructive behavior. >> reporter: this video from the web shows young men ganging up on a boy. three of the attackers are children of migrant workers. officials say more than half the crimes committed by minors today involve these kids.

migrant worker communities can be found in cities across china. many migrant children cannot attend regular schools due to registration and other problems. so some go to processes the authorities don't recognize. the classrooms are frequently scenes of fighting and bullying. >> translator: many kids spend the first half of the school year here and the latter half in another school. frequent relocations make the children extremely unstable and emotionally upset. >> reporter: once a child has been barred from other schools for being a troublemaker.

>> translator: i beat up anyone who makes fun of me. >> reporter: the boy lives with his brother and cousin. this man lost his wife five years ago in an accident. the family moved to china afterward. when the boys are not at school, they are left by themselves. wang works as a part-time porter at the local market earning less than $400 a month. >> translator: my job barely supports our family. i have no time to spend with my sons. >> reporter: today the city has been celebrating a festival. and the boys haven't returned home.

the father searches around town but comes up empty-handed. >> translator: above all i'm worried about my sons' future. they don't listen to what adults tell them. they have no discipline. i'm responsible for all this as their father. >> reporter: experts say there are reasons to be concerned.

. >> translator: these children often end up becoming destructive to others. rather than contributing to society. >> reporter: migrant workers play a key role in chinese industry. yet in many cases their children exist on the fringes of society. unless people bring these kids into the fold, china will pay a heavy price. the japanese world of sumo wrestling is deeply traditional and difficult to enter. that's why dozens of schoolchildren were lucky to join an international tournament for kids. the contest was hosted by sumo wrestler hakuho.

>> reporter: i'm in the center of sumo universe. today it's not the professional rikishi taking center stage, rather, it's the children from different parts of the world. 30 children from mongolia, china, south korea, and the u.s. faced off at the hakuho cup. many young japanese joined as well. anyone with an interest in sumo can participate. even if they are new to the sport. many professional rikishi or recess wear wrestlers joined in too. they gave tips and refereed the matches. it was a rare opportunity for the children to see their heroes outside the ground tournament. >> translator: seeing so many professional rikishi really motivated me. >> translator: this is my first time to participate in this tournament. i got nervous and lost my match. but it was fun. >> reporter: the annual event was founded five years ago by yokozuna grand champion hakuho.

a couple of days ahead of the contest hakuho invited six young americans to his training stable. the boys have been training intensively in the u.s. for the past two months. while they enjoy sumo this will be the first tournament they fight in. >> translator: not too long ago we were struggling to boost the popularity of sumo. even after the 2011 disaster we were able to continue holding grand tournaments. that's when i began to really appreciate being able to do sumo. i founded this tournament as a way to show my gratitude for the sport. >> translator: in sumo your right leg and right hand must move forward at the same time. doing this enables you to push your opponent with more force. >> reporter: the grand champion teaches the youngsters some of the basic moves he learned when he first turned pro.

>> he's way bigger than me. he's hard to push. >> translator: i learned, you know, all the different techniques and styles of sumo and how you can use it in the ring and how you can win the fight.of sumo and how you can u in the ring and how you can win the fight. >> how many people get to do this? >> reporter: after training the children were treated to a special meal. professional rikishi eat this hot pot daily to bulk up and get stronger. it's team usa's time to compete. let's see how they do. all right, here we go. the usa team captain will tucker versus a japanese here. he beats his opponent with a nice spin move. the american boys did their best, but advanced only to the second round in the individual and team events.

the team event title was taken by the mongolians for the first time. >> before, i thought sumo, you can only be good at if you were big. but now that i've seen other sumo wrestlers wrestle, it's taught me that any size can win. >> translator: sumo is about more than winning and losing. these children come from all over the world. if they can learn about japan and its culture during their stay and grow up to build some bridges between their countries in and japan, you can call this event a success. >> reporter: hakuho hopes by spreading sumo culture overseas, more children from around the world will come to appreciate the sport and even aim at becoming professional rikishi in japan. hiro morita, k world.

it's time now for the world weather with meteorologist sayaka mori. people in tokyo enjoyed the national holiday under sunny skies. will the nice weather continue? >> tomorrow is going to be even warmer. we're going to be feeling march-like conditions as we go into tomorrow. right now a high pressure system is covering much of japan, bringing clear conditions, even northwestern japan is seeing sunny conditions and snow is not falling. precipitation-free across many parts of japan. things will get wet across the west. there is a low pressure system coming into the korean peninsula. so we'll likely see an additional 80 millimeters of rainfall in just 24 hours, four times more than the monthly rainfall for february, and north korea may see up to 10 centimeters of snowfall. this will more likely affect japan as we go into the weekd. 's going to be very wet and it's going to be windy during

the weekend. a high pressure system is causing lots of warm air from the south. it has been very warm across parts of japan and across the south of china, the korean peninsula, and warm weather will likely affect the northern portions of japan into the weekend. so during the weekend, sapporo will see rainy weather instead of snow. and as for tokyo, 20 degrees expected over the weekend. that's 10 degrees higher than normal. that's more like late april, actually. shanghai over 10 degrees higher than normal on your friday. taipei about 5 degrees higher than normal as we go into the weekend. let's look forward to that. across hawaii, there's a giant low pressure system over the north. and this is sending large and dangerouwellsoss nor the nor and west coast of hawaii. waves could hit up to 14 meter into trsday moing acro t rthwest coastf t hawaiian islands. wednesd a bigur of eve

surfing event was scheduled. because the height of waves didn't fit the criteria of event it was canceled but waves will remain quite high into tomorrow morning. temperatures across hawaii and honolulu will see quite high temperatures as we go into the weekend. 28 degrees for the high on friday as well as saturday. it has been very chilly at night butinally things will be warming up so that's good news. let's goo north america. record high temperatures were set in los angeles and suounding areas this week. however, the northern areas, rainy weather for you across the pacific northwest. and 180 millimeters of rain could fall for the next three days or so. watch out for flooding. and then another big story is extremely low temperatures. that is expected into the weekend across the eastern united states as well as eastern canada. we are expecting very, very low temperatures into the weekend. minus 14 degrees for the morning low in toronto on your thursday.

even going down to negative 23 degrees during the weekend. frostbite could happen in a matter of minutes so cover your skin. chicago, minus 15 for the morning low on your saturday. and new york city, you could feel like minus 20 degrees or so due to strong winds. so please watch out for the extremely low temperatures. now, to avoid hypothermia, hats and gloves, you may want to wear this stuff. don't forget your pets. move pets inside and have extra food and water in case of emergency. all right, here your extended forecast.

now the calendar may say it's mid-winter but in one famous garden in osaka prefecture, spring is in full swing. the plum trees at the something like that are blooming much earlier than usual. the garden boasts 800 plum trees in about 80 varieties. the earlies bloomers began showing their colors about a month ahead of schedule this year. the kagoshima variety is already peaking and giving the garden a deep pink hue. >> translator: some of the trues are in full bloom and other will blossom soon. so i think we can enjoy them for a long time. >> the plum blossom viewing season at the shrine is expected to last until mid-march.

that wraps up this edition of "newsline." we'll be back with more news at the top of the hour. i'm kanako sachno in tokyo. thanks very much for joining us;