>> if these madmen ever got their hands on a nuclear bomb or nuclear material, they most certainly would use it to kill as many innocent people as possible the nuclear summit in washington ends with a promise of better global security the world news from al jazeera. also ahead. i apologise south africa's president says he's sorry for spending public money on his private home. anger in philippines over lack of government relief.

beauty in bloom, how cherry blossoms are big business for japan world leaders have ratified a treaty to keep nuclear material safely under lock and key at the nuclear security summit. 102 nations made the pledge to prevent nuclear terrorism. obama warned world leaders of the threat posed by armed groups like i.s.i.l. trying to gain access to nuclear weapons. >> reporter: all smiles at the end of the nuclear security summit in washington, and for good reason. an international treaty that requires countries to do more to safeguard nuclear material is about to take effect. the u.s. president obama warned his fellow leaders more must be done. >> there is no doubt that if these madmen ever got their hands on a nuclear bomb or

nuclear material, they most certainly use it to kill as many innocent people as possible >> reporter: his warning comes weeks after the i.s.i.l. attacks in brussels amid the report the suspect may have been spying on a nuclear scientist. some anti nuclear activists say the u.s. have maybe focused on summit on the wrong threat. they want more cuts in the number of nuclear weapons in u.s. and russia. they don't want north korea to become a nuclear state. that's a matter obama discussed with his counterparts on thursday. some say they have chosen not to choose between nuclear security and nonproliferation >> it is found in far more states than just states with nuclear weapons. about 24 countries have material that could be used for a nuclear weapon. what the president did was really elevate political

attention to these materials and provide political momentum for securing them and ideally eliminating these materials >> reporter: this is the final summit of its kinds, so what happens now? >> today we agreed to maintain a strong architecture, including through the united nations, the international atomic energy agency and inter policy to carry on this work-- interpol >> reporter: the success will be whether they guard their nuclear material without a nudge from the white house an official says we need to pay attention to the real threat of nuclear weapons >> it was not the focus of the summit. the summit has very specific role, to look at the security of materials, but i think we do have obligation to look at the security of weapons and at reducing them. we have the united states and russia reducing the number of

the weapons after the end of the cold war. it's still not enough. we do have india, pakistan still engaged in regional arms race, both building their arse analysis. even toe-- arsenals. even though it is a big accomplishment in itself and contributes to lowering the risks of nuclear terrorism and materials getting in wrong hands, but we shouldn't be forgetting about the bigger picture and eliminating working on eliminating the nuclear weapons themselves meanwhile, north korea says it will continue its nuclear and ballistic weapons proposal. south korea says the north fired another short range missile on friday. a north korean official says the peninsula is now in a state of nuclear war. pyongyang said it will not tolerate searching of its ships under sanction.

the south africa apologizes for spending public money on his home but said he did not act dishonestly. >> reporter: the president was ordered to pay the state coffers for home improvements for things unrelated to security, things like a swimming pool and theater. the president said the gross over spend should never have happened. >> the matter has caused a lot of frustration and confusion for which i apologise on my behalf and on behalf of government. >> reporter: but he defended his actions say he had always intended to pay back the money. >> i respect the judgment and

will abide by it. i have consistently stated that i would pay an amount towards the non-security upgrades >> reporter: but he was dismissive of the demand he repay some of the money he spent on upgrading his home. the country's corruption watchdog investigated after costs ballooned. the public protector said she should repay a portion on the non-security features, but he dismissed the findings and the government issued several reports that exonerated him from any wrongdoing. at the start of the constitutional court hearing, the president did a u-turn, acknowledging he did owe some money, but that's not enough for his biggest critics. the economic freedom fighters say they will force him from

office. they're encouraging south africans to take to the street. they want him to resign and they called his address to the nation contradictory and insulting. they may not have won his resignation, but they certainly have a lot of ammunition ahead of this year's local elections. the anc has whom harltdly backed zuma and thanked him for humbling himself with an apology. the events of last few days underscore the dominance of the anc which still has the support of most people. the president and the party are under unprecedented pressure the united nations has criticized a deal between the e.u. and turkey on refugees. on the greek island hundreds of refugees protested after clashes broke out at their holding center. at least ten people were injured. about po 0 broke through a forensic and ran away to avoid

being deported to turkey-- 300 broke through. >> reporter: the u.n. yet again expressing concern about the e.u.-turkey deal just three days before it is to be implemented. hundreds of migrants and refugees who landed on greek shores since 20 march are now being held in detention facilities. the u.n. is concerned about the conditions inside those detention facilities which are basically prisons. the u.n. says that they're over crowded, lack of sanitation, but it's not just that. the world organization is worried that these people, their asylum requests are not being properly processed because of the lack of time, and they're also concerned that international law could be violated. >> today we're urging the parties to the recent e.u. and turkey agreement on refugees and migrants to ensure that all safeguards are in place before any returns begin.

this is in light of continued serious gaps in both countries. >> reporter: the u.n. is also concerned about the 50,000 migrants and refugees who are now stranded in greece. these people are not part of the e.u.-turkey deal. they have been trapped since europe closed its borders, the u.n. saying that anxiety and frustration is growing and tensions have been on the rise. in fact, we have heard of fights between the different communities on the ground. many of those stranded in greece say they haven't been able to apply for asylum. no-one picks up their calls. the u.n. is worried that greece does not have the capacity to process all the asylum requests. >> without urgent further e.u. support, the limited capacity of the greek asylum service to register and process asylum claims will create more problems. there are very limited hours of registration, daily ceilings on

registrations, lack of access to the skype system for registration whereby people receive their appointments and their interviews via skype. this is adding to the anxiety. >> reporter: the e.u. seems intent to implementing the deal. it will be an important show of force to show my grant and refugees that they are serious, especially since the deal came into effect on march 20, but the arrivals continue. undoubtedly a much lower number than in the past, but people still continue to land on greek shores. deportations could be seen as a der ternt a team of independent investigators appears to be verifying the mexican government's version of what happened to 43 missing students. the experts say at least 17 were burnt at a trash dump. mexican authorities have said the students were aborigine ducked in september 2014 and later killed by a drug gang at the site. -- abducted

the mexican border fence video shows it is not too hard. these boys are shown easily climbing over. there has been a heated debate among republicans with the front runner donald trump promising to build more walls should he win the presidency. >> reporter: this video from a mexican television news channel captures what appears to be a brazen incursion into u.s. territory apparently carrying contrabands taped to each of their backs which were suspected it be drugs. they were only there a few seconds. they climbed over the wall in 30 seconds showing that they do this quite often. we have filmed there several times. we have spoken with smugglers

who tape heroin to their body and go across with legal visas. we have also seen footage of catapults being used to sling marijuana and cocaine over the border into the u.s. it just shows that drug cartels and criminal organizations will use any means at their disposal to get drugs into the u.s. and, of course, they have to then get money into mexico and they use some of those same very strategies lots more still to come here on al jazeera. one year on, kenya marks the anniversary of the attack on the university which left 148 people dead. >> reporter: i'm in cambodia where the united nations says thousands of children in orphanages are not, in fact, orphans. orphans.

welcome back. a recap of the top stories here on al jazeera. obama says 102 nations have signed a treaty aimed at preventing groups like i.s.i.l. obtain nuclear materials. south african president has vowed to pay back money. the e.u. plan criticizes the deal. it was a disaster that shook kenya. over 140 students killed and more than 70 people taken hostage by armed men linked to

al-shabab. one year on many students are still afraid to go to school following that deadly attack. malcolm webb reports now from the university in northern kenya. >> reporter: these students ran away or hid when dozens of their friends were shot and killed. this lady lay under her bed for more than 12 hours. it was a year ago when attackers from the somali armed group al-shabab stormed their dormitory in northern kenya. >> reporter: i'm a journalist. >> reporter: we spoke to her on the phone from just outside the campus during the attack. now she told us the full harrowing story of how her friend carol was killed. >> she was pregnant, seven months. so i guess it was pains. she started crying that's when

they realized that there was somebody inside the room. so they went to the bathroom and then they stopped on her. >> reporter: more than 140 students were killed. the attackers came from this direction and they found students sleeping here inside the girls' dormitory. most were killed. mercy was hiding throughout. there were only four guarding the ufrt at the time. many wonder if it could have been protected. the former principal says it was an obvious and vulnerable target. he showed us letters sent to the government in the months before at tack requesting more security. he says they were ignored and he says it was adisaster for a region that's already poor an marginalised. >> we don't have own our teachers. it has left more fear to suspicion between us. so literally we are in a

quagmire. >> reporter: help came late last year. there are now 25 armed police on the campus. security in the whole of the northern region has improved. in january the university reopened for part time students, mostly from garissa town. university staff are hoping hundreds more from all over kenya will feel safe enough to come and start courses in september. [ ♪ ] >> reporter: meryy and her friend practice a song for a memorial hearing. they were transferred to other parts of the country. they say they never want to go back, but they say they will never forget what happened that day nor the friends they lost malcolm joins us line. as you say, this was an attack that shook the nation. what are we expecting to happen

there today? >> reporter: there is a memorial event planned here. some politicians are coming from the capital. there's going to be some speeches, some prayers and singing, and the unveiling of a new memorial which you can see here. it has recently been completed and it has all the names of the victims. there will be another one in nairobii. the survivors of the attack here, very few of them, are here any more. they were mostly transferred to assist the university elsewhere. most of them weren't from this part of the country and most say they never want to come back after what happened. they will be having a memorial event there to remember those who were lost thank you. the u.s. says it has killed a

key leader of al-shabab. he was one of three people killed in a drone strike south of jilib. he was linked to two attacks in mogadishu, one in an airport and another on a hotel. the kurdistan workers party or p.k.k. says it was behind the car bombing in turkey's south-eastern city. 17 officers died and others were injured. >> reporter: the explosion shalt erred the calm of this residential neighborhood-- shattered. the damage is clear. this family, this shock, they survived the attack. >> translation: my parents were cooking in the kitchen. i was in the bathroom. my children were studying in the living room. all of a sudden with the powerful explosion we felt the storm and saw something very strong coming on to us. it was like an apocalypse. >> reporter: many stood in

disbelief. many more scared. >> translation: we heard the explosion. we thought it was an earthquake. we were worried and scared. >> reporter: the car was parked here and detonated by a remote control. once the minibus carrying the police arrived at this corner. the explosion was so powerful it shattered the windows of the surrounding buildings. security officials say they have identified the man in this cctv footage as the main suspect. turkey is increasingly being targeted. last month a suicide attack carried out by an i.s.i.l. suicide bomber killed several tourists in istanbul. both ankara and istanbul have seen a spike in attacks since last year. the government says the country's security and economy are the targets. several kon sol aeights have-- skull eights have-- consolutes

have closed their mission and warned against civilians visiting thor-- the area in northern iraq at least three policemen were killed by a suicide car bombing in the town of mak mur. it happened in front of a government building. three other bombs went off on the outskirts of the town. peshmerga forces were the targets. i.s.i.l. claimed responsibility. violence in the southern philippines between farmers and police have left at least two people dead. about 6,000 blocked the highway in the north province. they were demanding financial help after months of dry conditions. gunfire broke out as police tried to disburse the crowd. >> reporter: a standoff between protesters mainly comprising of farmers and their supporters and

police authorities continues here in central area. on friday we saw skirmishes between the protesters and the police station as the police tried to move them away from the highway. two are confirmed dead and dozens injured in hospital. the protesters and the farmers, who are the large majority, are still situated in the church compound. the police want to make sure there are no firearms in the area and so with senior church figures and senior politicians from the local area, there was a search of the location. nothing has been found. both sides coup accuse the other of starting the firing on friday which led to those two deaths. at the moment the standoff continues. the protestors, including the farmers, say they will not leave

the premises until their demands are heard. they are to get relief aid that wasn't available to them when this draught continued. this drought has been continuing now in the area for many, many months. there was supposed to be aid given in january. nothing has been given so far. very little, and that's what these farmers are protesting about. they want the authorities to do something. this is causing great anxiety to the central government in manilla in the lead-up to the general election indian police have detained six senior employees of a construction company after a section of a flyover collapsed. at least 24 people were killed. 90 people have been rescued but no further survivors are expected to be found. workers say it will take up to three days to remove a concrete slab hanging off the bridge. almost 12,000 children in

cambod cambod cambod cambodia live in an or fannage. our correspondent reports from of siem reap. >> reporter: it is the night before exams and this boy is studying hard. he didn't start school until he was 12 after coming to this or fannage here. he isn't an orphan and neither are many of the children here. >> translation: my parents sent me to this center seven years ago because they had problems earning a living. they couldn't send me to school and we didn't have food. >> reporter: a recent study by the government found that almost 12,000 children currently live in orphanages in cambodia but three out of four of them have a living parent. the government and the u.n. are

now pushing to return these children to their families. >> some of these institutions are actually not carefully monitored, they are not respecting minimum standards of care and what is very important is also that there are mechanisms in place to inspect those institutions regularly. >> reporter: but this man's parents say he is better off where he is. they say they can't afford to look after him. they earn less than $5 a day selling balloons on the street. >> translation: if he stays with us, he will have to work hard. my son will end up as a construction worker. >> reporter: staff at the together for cambodia or fannage say he has a chance for a better future if he stays with them. >> translation: we accept children who are at risk of abuse and violence.

in this situation, if you send them back, i don't agree with that. >> reporter: both the u.n. and/or fannages say that the welfare of these children must come first, but the question is who can offer better care. the government has yet to regulate that children with parents must return home. organizations like together for cambodia are hoping it doesn't come to that finally, it's cherry blossom season across japan and it coincides with record numbers of tourists. it's the time when many japanese engage in the traditional custom of an outdoor party. rob mcbride looks at the excitement and big business that the blossoms bring >> reporter: it happens every year so people shouldn't be amazed, but it's still amazing. across japan the cherry blossom

is blooming and the whole country is gripped by hanam i, quitely literally looking at flowers. the verdict for this season is it's as good as it gets. >> translation: when they fall, it looks like it's snowing. >> translation: i'm glad i was born japanese. >> translation: it makes you happy and you forget all your troubles. >> reporter: pulling in the crowds is the knowledge that one bad storm could blow it all away. it is all the more beautiful for being so fleeting. this could be the source of much of that beauty. it is one of a number of hybrids here in this park of northern toe tokyo that is more than 100 years old and has been the subject of research study. researchers believe grafts taken from this tree can be the most

common variety of cherry tree. sharing a common genetic background would help explain why the cherry blossom comes with such certainty. no bad thing in a country which likes things to be precise and invaluable for the tourism industry. to being yoe district plans a festival around it, promoting its own cherry trees and her chan dieing everything to do with the blos a.m. >> translation: loning shops and department stories get together to create an experience. >> reporter: at night-time blossoms are created where they don't exist. with a weaker yen and the upcoming olympics in four years time, they see tourism as vital for the economy. it had planned 20 million visitors per year by 2020, but it is also achieving that. so now it has doubled the target

to 40 million. better get planting more cherry trees all the news, of course, on our website. there it is on your screens, aljazeera.com. >> on january 12, 2010, the grouped shook beneath haiti, the western hemisphere poorest country. it was the worst earthquake in 20 years. billions of dollars poured in, but what has happened since may shock you. i'm ali velshi with a special edition of "on target." haiti on shaken ground. $13billion, that's the full price tag for one of those u.s.