♪ today the united states together with our allies and partners has reached a historic understanding with iran. >> reporter: a nuclear agreement between world powers and iran after more than a decade of talking. ♪ i'm david foster live from london with al jazeera and also coming up, coming up, 147 killed many more injured after al-shabab storms the university campus in kenya. an important gain for houthis in

yemen as they seize the presidential palace in aiden. and restrictions across california as the government orders a 25% cut in water use. ♪ well at least iran and six world powers reach what they say is an understanding which they hope will lead to a comprehensive nuclear agreement within three months, as part of the future deal the nuclear enrichment will be to one side only and iran agreed to reduce its low enriched uraniam stockpile from 10,000 kilos to 300 and 95% cut and centrefuge from 19,000 to 6,000 and the u.n. and u.s. will gradually lift nuclear-related sanctions after inspections by the

international atomic agency and an aim for a new deal to be concluded by june the 30th and that will include a u.n. security council endorsement. let's hear from james where the talks took place. >> reporter: after round the clock make or break negotiations, these world leaders were celebrating what they hope will be a historic moment. the eu high representative made the announcement with the iran foreign minister details how iran's nuclear program will be restricted in phases over 25 years and centrefuges down to 6,000 and limited to one facility. >> iran enrichment capacity and enrichment level and stockpile will be limited for specific durations and there will be no other enrichment facility. >> reporter: and in the fate of the once secret bunker built

inside a mountain. >> and will be converted from an enrichment site into a nuclear physics and technology center. >> reporter: and does this count as the framework agreement? the white house had promised by the missed deadline of the end of march? iran's phone myron ster -- foreign minister said no and added this. >> we did not put all of this time and energy and many sleepless nights to write a piece of paper hopefully by june 30th that we are going to just look for an excuse to violate and abandon. >> reporter: u.s. secretary of state spent more time on this than any other issue. john kerry says the negotiations process can already be judged. >> it's important to note that iran to date has honored all of

the commitments that it made under the joint plan of action that we agreed to in 2013. and i ask you to think about that against the back drop of those who predicted that it would fail and not get the job done. >> reporter: nuclear talks will continue with tough bargaining between now and the final deadline of the end of june. but this is an important milestone and not just on the nuclear issue, iran and western leaders may just be beginning to build a new relationship after 36 years of miss trust and hostility. james with al jazeera. across the atlantic on the lower of the white house this is what the u.s. president had to say. >> the united states together with our allies and partners has reached a historic understanding with iran. which if fully implemented will prevent it from obtaining a

nuclear weapon. as president and commander-in-chief i have no greater responsibility than the security of the american people. and i'm convinced that if this framework leads to a final comprehensive deal it will make our country, our allies and our world safer. >> reporter: back to switzerland simon mc-greger wood for us and what happens now simon? >> well beside as you heard john kerry said at the press conference they have a lot of work to do and no binding nature to agreements until the fine tuning and cross the t and dot the i have to be completed between now and june 30th interesting i thought that each side clearly spinning it to their own advantage, i think from john kerry it was noticeable and agreed to which he spoke at the level of restrictions on iran's nuclear program, the extent to which the ability to enrich uranium will

be cut and invasive and high-tech nature of inspection regime and of course on the other hand the foreign minister zarif from iran talking about the positives from the iran point of view and talking about the fact that tehran will be allowed to continue enriching uranium and none of the sites are closed and after the full deal implemented sanctions including the tricky u.n. ones they were keen to have removed will all go at the same time. if i was judging who has the biggest challenge in terms of selling this deal domestically i would say it would be john kerry, he has a meeting with the senate foreign relations committee in a week and obama needs to sell this deal the positives of it to try and sea off the threat from a very skeptical congress who want to come back in a couple weeks time and potentially do down the deal by imposing further sanctions on

iran. so it's a tough challenge ahead for the american administration and guess is they have plenty of material from this quite detailed agreement sealed here tonight to try and do that job. >> simon, thank you very bringing up that last point, that is something we will get on to now, the republicans in the u.s. quick to react, house speaker john boehner saying the deal with iran represents an alarming departure from obama's neshl goals and tom ackerman is live for us in the u.s. capitol and simon alluded to the fact the republicans could well make mischief with the deal and could they actually scuffle it? >> simon mentioned that they could impose further sanctions but one key element here is that they can -- there are sanctions that are currently continuing and there is -- congress has to actually eliminate those sanctions. and right now there is no end date to them so the congress in

that respect has the upper hand because the president could veto additional sanctions. again, this is all contingent on a final deal which supposedly will only be concluded in june so it's still academic but the fact that congress is of a mind to be very very critical and to scrutinize details is something that the president and his staff are fully conscious of they say that they willfully brief congress, give them all the details and once the technical details are ironed out and those are ongoing working those out and meantime administration is also being conscientious in assuring its allies who have not been very enthusiastic about this deal,, in fact, the president was on the phone with prime minister netanyahu of israel we have not heard what the content of that discussion was, but at an earlier conversation with king solomon of saudi arabia according to the

white house the president emphasized the nuclear understanding will not in any way lesson u.s. concern about iran destabilizing activities in the region and agreed to remain vigilant in countering the threat so the president obviously wanting to calm the apprehensions of those people who are not on board on this agreement, meanwhile israelis simply are -- don't believe that the iran people can be trusted and one senior member of netanyahu's cabinet is being quoted here as saying that this deal is simply not trustworthy, so therefore administration does have a high road to negotiate here in the next couple of months. >> tom, thank you, you mentioned the reaction of the israeli prime minister and mtst. >> reporter: benjamin netanyahu has been the fiercest critic

about the negotiations between western powers and iran trying to make this agreement that they have now reached to move forward. mr. netanyahu has consistently said that any kind of deal or agreement needs to involve a major as he put it roll back of iran's nuclear ambitions and it's quite telling that when president obama made his statement after the agreement was announced that he spoke at length about israel and israel's concern. mr. obama said that while he and mr. netanyahu don't see eye to eye on this issue, that he reaffirmed the u.s. commitment to israel's security. whatever the case mr. netanyahu again as we have been saying what has been a critic of a deal with iran and says a deal with iran not only threatens israel but the middle east and

as he put it the rest of the world as well. >> ♪ al-shabab gunmen say they were behind attack that killed 147 people at a university in the northeast of kenya and deadliest attack on kenya soil by the group there has been. and masked gunman stormed the campus in the city taking hundreds hostage. am siege is finished but a dusk to dawn curfew in the region and we will hear from the correspondent on the ground but first from emma. >> reporter: it was supposed to be a place of learning but instead became a battleground and kenya troops tried to flush out al-shabab fighters up in the university college. they stormed the building in the early hours of the morning while students were sleeping.

security forces were deployed. and it is close to kenya's border with somalia and targeted before by al-shabab, a somali based group linked to al-qaeda and some students were taken hostage and others managed to escape. >> they started jumping up and down running for their lives but unfortunate where they were going to is where they were coming from. >> reporter: within hours al-shabab said it was behind the assault. many of the injured suffered gunshot wounds and inside the hospital where they were treated pain grief and horror. [crying] . >> translator: we were praying and were about to finish when some people came in from the main door and started shooting they started shooting. there was one gunman firing from the doorway so i had to jump out of the window and that's when i was hit by a bullet in the leg. >> reporter: this attack will

undoubtedly lead to questions about whether enough security was being provided at the university. >> 90% of this has been eliminated as i speak to you now. and this is a very heavy cost. as we go through this and as it stands now we are able to rescue over 500 students. >> reporter: a dusk to dawn curfew is now in place here and kenya people once again trying to come to terms with the loss of so many emma with al jazeera. let's get the latest from malcolm web. >> reporter: after a very heavy fire fight this afternoon which reached a climax in the afternoon with cloud explosions after that the fighting stopped and we have since spoken to a couple of people on the phone

inside the university compound and this information is not coming from official sources but eyewitnesses we spoke to there and say at the moment the security services and other people are still a bit concerned, a bit worried about going in the building since the students' residents building where most of the fighting was and most dead hostages are and think there may be one assailant in there and loud explosions we heard this afternoon were one or possibly two of them wearing suicide vests and blowing them up and think the remaining people in the building could also bewaring suicide vests and of course people are treading very cautiously about trying to find what they believe to be the last remaining killer. >> let's bring in the director of african immigrant caucus talking to some washington d.c. did you think as been suggested the kenya authorities really did know this might be able to happen, they had been given some warnings? >> i looked into it a little bit

more and i think. >> we have technical issues. let's carry on, the sound disappeared for a moment. you were saying, what did you find out when you looked into this allegation? >> okay we have not rectified the problem unfortunately. we will be back with that story a little bit later on here on al jazeera. right now if you stay with us there are more revelations about the copilot suspected of deliberately crashing the german wings plane, a prosecutor said this man researched methods of committing suicide just days before the crash. with just over a month until elections in the uk leaders of 7 political parties face off during a live t.v. debate and details on that coming up stay with us if you can.

>> our special month long focus,

♪ time to remind you of the global headlines this hour after a decade of talking a deal has been done on iran's nuclear program. six world powers and iran reached what they call an understanding which is hoped will lead to a comprehensive arrangement within three months. >> today the united states together with our allies and partners has reached a historic understanding with iran which if fully implemented will prevent it from obtaining a nuclear weapon. >> reporter: in kenya at least 147 students killed during a

siege of the university in the northeast of the country, gunmen from al-shabab stormed the camp p campus in the city taking hundreds hostage and the siege is over but a curfew is in place. houthi fighters made significant gains in battle for control of yemen and pictures show rebels on top of the presidential palace in the southern port city aiden. the country's president haidi had been living there until a week ago. on thursday the houthis also took control of the commercial center of aiden and those attacks on the presidential palace are a blow to the saudi-led coalition carrying out air strikes in yemen. and saudi arabia has experienced the first casualty as well interior ministry saying a border guard soldiers was killed by gunfire coming from inside yemen. ten soldiers were injured. and al-qaeda has been taking advantage of turmoil expanding

its foot hold and fighters from the group stormed a prison in the eastern city and freed hundreds of people including at least one of their own leaders. a saudi-led coalition spokesman confirmed the houthi attacks in aiden but says they are working to isolate houthi fighters there. >> translator: we managed to fend off all houthi fighters on the outskirts of aiden and say the situation is calm and stable. following the houthis coup against legitimate president of yemen they took control of the resources and military gear of yemen forces and presidential palace came under attack and some houthi fighters took station in the city and yesterday those fighters attempted to seize control of certain government facilities, heavy fighting urerupted and suspectd because of tactics and techniques by the malitias are well-known to us.

they are aiming to gain certain media victory and it's a desperate attempt by houthi fighters totally isolated in aiden and being hunted down and targeted at various locations within the city. we are in close contact with popular resistance fighters and we will rid the city of those in infillin inf infiltrators. >> reporter: people are home and worried to go out because of the violence and it makes it difficult for small businesses many of which have closed down and jamal reports. >> reporter: a food store open for business in sanaa what has become something of a rare sight with a city under bombardment and the war in yemen not only forced people to flee homes in search of safe haven and made many businesses shut their doors as an already battered economy is further devastated. >> translator: there are very few people left here and everyone has fled and those who stayed live alone without their

families and hardly nerve one comes to buy anything any more. >> reporter: what makes it more difficult for him is that his shop is not far from the airport and the military air base. prime targets in saudi-led air strikes against houthi fighters who currently control the capitol capitol. one million children under the age of five malnourished and the food program say 13 million depend on dirty or polluted water for drinking. >> translator: there is no doubt this war has gravely effected the yemen and food and other products are available, the average yemen can no longer afford to buy most things add to that the fact many families are now displaced and making poverty and employment rise drastically. >> reporter: back at the store he finally has a customer but all he buys is a bottle of water. water. >> translator: now i'm lucky if i make $20 a day and how can i pay rent or electricity bills.

if the situation stays like this i'm surely will be out of business in days. >> reporter: as the war in yemen goes on for the ordinary citizen everyday is a battle for survival i'm with al jazeera. israeli troops are searching for a man who went missing in the area of the occupied west bank and worries he may have been abducted. police alerted on thursday afternoon the man disappeared after stopping to fix a flat tire and looking for assistance in a nearby palestinian village. last year three israeli teenagers were abducted and killed in the west bank chain of events that led to a 50-day conflict in gaza. a russian troller has gone down off the country's far east coast killing at least 54 members of its crew. number of fishing boats have been on the scene rescuing 63 people from freezing waters 15 are still missing. the ship took just 15 minutes to sink and after hitting some ice.

most of the crew were from russia and myanmar. french authorities say that investigators have now found 150 sets of dna at the site of the german wings crash, it will take five more weeks to officially identify the victims there. they also found the second black box and say given the condition they do hope to recover its data and the voice recorder revealed the copilot andreas lubitz was alone in the cockpit and locked the pilot out. prosecutors in germany say andreas lubitz had been doing internet churchsearches in ways to commit suicide in the days before the crash. >> translator: the user informed himself about medical treatments as well as different kinds and the implementation of a suicide on at least one day the user searched for several minutes for cockpit doors and their safety precautions. >> reporter: greece finance

minister admitted the negotiations of what is called the group and lent greece lots of money and take you there and two months and was clear, it's the only way for the government to get what he wants. >> translator: the negotiations could have finished by now yes, they could have. last week four weeks ago, we would have had to cut supplementary pensions by 70-80% and would have had to accept an increase in bat tax on the islands, we would have had to give further impetus to the cry 'tis sister of last five years and we are wrong because we did not agree to all those things that the greek people elected us not to sign. >> reporter: 7 top political parties in uk have blows in a televised election debate and here is lawrence lee. >> reporter: phenomenon in british politics three dominated for so long and yet seen their

reputations diminished and a cynical elaborate demanding cage. -- change and parties from the left and right and the party accused labor of selling out the poor and demand the rich pay. >> vote for this is to make scotland voice heard and ours is a voice for new, better and progressive politics at westminster. >> reporter: on the right the uk party said the conservatives sold out britain by letting in too many immigrants and going to europe. >> depressed the housing and tough to get a gp appointment and not been good for this country. >> reporter: issues like the uk's huge budget deficit and you can see how far apart parties like the greens are from traditional economics. >> it's worth saying over the past 100 years about half of it britain had a higher gdp ratio and no one worried about it

much. >> reporter: david cameron accused people. >> more debt and more taxes, a lot more debt and more taxes, some more debt and taxes and definitely more tax and taxes. >> reporter: particularly sharp exchanges on immigration, the mainstream parties said they wanted controls but the female leaders of the insurgent from whales and greens said migrants should be welcomed rather than blamed. >> this is where it goes and who who calls this economic crisis it was bankers. >> reporter: not to be outdone by labor and liberal democrats suggested they wanted a better deal for the poor. >> if i'm prime minister i'll make sure we reward the hard work of everybody in the country, not just those who get a six-figure bonuses and you need to take a balanced approach and need to reduce spending and ask the richest to make a contribution it's the only fairway of finishing the job.

>> reporter: no disasters and no winner but polls suggested the scottish leader nicholas had come out particularly well. the whole of westminster will hate that. so that is it the one and only chance during election that the 7 party leaders will have been seen together not much love loss between many of them but the polls are so close that a coalition of two and potentially three parties in the next governance looks more and more likely. whether they can get along with each other to make a government work that is another question. lawrence lee, al jazeera, manchester. after another winter of poor snowfall in california the government says there is 25% cut in the amount of water people use. rob reynolds reports. >> reporter: california's lush green parks, play grounds and lawns and golf courses could soon be rendered in a dusty shade of brown as the state en

enters the fourth year of doubt and restrictions on water use and the governor jerry brown called for a 25% decrease in the water consumption all across the country's most populus state. >> people should realize we are in a new era, the idea of your nice little green grass getting lots of water everyday that is going to be a thing of the past. >> reporter: reservoirs are drying up the snow pack in the mountains source of 30% of california's water is at its lowest level ever reported. these slopes should be about a meter deep in snow now they are bare and one scientists called the sieria nevada the nada. >> reporter: the last drought over 500-1,000 years. >> reporter: some critics of brown said he didn't go far enough and should have had rationing on a mandatory basis

and some say the impact of order will fall on individuals and the state massive agra businesses and consume 80% of california's water. gets more at al jazeera.com. a a show about intersection of hardware and heuvment and we're doing it in a unique way. this is a show about science, by scientists. tonight, "techknow" investigates mining the deep. dr. shini somara is a mechanical engineer. tonight, one company's ambitious plan that could