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believe that success takes partnership and discipline. mufg, we build relationships that build the world. >> and now, "bbc world news america." >> this is bbc world news america. i am laura trevelyan. can it keep the momentum? in switzerland another day. the u.s. cites progress in the nuclear negotiations with iran, but no deal. the story of the great migration. williams of african-americans moved from south to north, forever transforming the u.s.

welcome to our viewers on public television in america and around the globe. an magnificent victory is how the iraqi government is describing the islamic state being driven out of tikrit. this comes after a monthlong offensive to recapture isis held saddam hussein's hometown. a diplomatic resident in the center. when you see the iraqi prime minister parading through the center of tikrit do you think iraqi forces can hold the city? >> i hope they can. this is good news in an otherwise bleak situation in iraq. we needed this. the prime minister needed this. it is a great achievement.

he is right to celebrate. i think he should be possible to hold the city. laura: whose victory is this? a victory for iranians ground forces or u.s. airstrikes? >> for both. it is a victory for iraq, first and foremost. any defeat of isis is for iraq. they are mortal enemy of the country. they have brought death destruction, and violence, and must be defeated. a lot of critic has to go to trimester vitae. -- has to go to prime minister abadi. he managed to get all hands on deck without excluding anyone. host importantly, the iraqi

armed forces did their job. laura: it was an uneasy alliance between the iranians and the americans. do you see that holding? >> the conductor of the orchestra is the prime minister. if he manages to get them all to do their role, and keep a central role for the iraqi security forces. iraq is threatened by losing its hold on the country to nonstate actors. the key is to keep a central role in the hands of the iraqi security forces. the government security forces. and to allow others who are needed to help. laura: do see this as a dress rehearsal for the battle for mosul?

that could be happening in april or may. >> we saw the choreography of the malicious pulling back, the americans and their airstrikes. this could be necessary to satisfy the political orientations of everyone. but abadi delivered. isis is out of tikrit. it is a good achievement and if all goes well for mosul, iraq is better off today. although it still has a very tall mountain to climb. laura: how does it prepare the divide even if he gets rid of isis? >> isis gives us an opportunity to preach the secretary and divide. isis has brought together the differences except for the extremists. the extremists will never come

to the center. that it has brought together moderate sunnis and shiites for a common enemy. laura: thank you for joining us. just over the iraq border islamic state in syria has taken control of part of the refugee camp in damascus home to 18,000 people. it has been caught in the battle for control of the area. there are reports of fighting continuing between isis fighters and another rebel faction. in switzerland negotiation's with iran's nuclear program will proceed for another day. the further extension came after progress had been made. a political understanding had not been reached. more on the discussions i spoke with nicholas parents who served at the u.s. under secretary of state.

you are a veteran of these negotiations. what is going on behind the scenes? nicholas: the stakes are very high. particularly for the u.s., britain, these are tough issues. i'm thinking of the arabian side who might be trying to look for some small advantage in the closing hours of the talks. written and the united states, and the other countries are willing to stay a third extra day is an indication that they are close. i would not be surprised to see an agreement tomorrow. you should also consider the alternative with the talks ended without agreement. laura: president obama has invested so much in trying to get a deal. does that make them vulnerable to a bad deal?

nicholas: i don't big it does on two reasons. the united states has been clear for many years that there are parameters we cannot accept. there is the reality of the u.s. congress. republicans in congress have then ambivalent if not opposed to a deal, depending on the republicans we are talking about . if president obama brought back a deal to capitol hill that was flawed he would have very little chance of acceptance by congress. that would be a political problem for him in our constitutional system. they will insist on certain parameters. sanctions cannot be lifted in one fell swoop because you want to have a graduated basis to release them to ensure that a ran has an incentive to comply with the agreement. laura: is it hard to reach an interim agreement. will they'll be -- will there be

an agreement by the end of june? nicholas: it is in the interest of iran to get a deal. the ones most desperate for an agreement is the iranian government because of the sanctions. they need to go back to exporting oil and gas to the major economies. south korea japan, and china. there is a public anticipation in iran that finally they might be relieved of the isolation in which it finds itself, and that it may have a more normal relationship with the united states. it has been 35 years since that happened. the pressure is felt tonight. it should leave. the foreign minister is interested in getting a deal and as an american i think this is the right talents i want to see. i want to see the united states and our allies exacting leverage on the iranians to get the best deal. laura: news from around the

world. a fire in the gulf of mexico on an oil platform belonging to pay next. the fire took hold on wednesday. 300 people were evacuated by helicopter. firefighting votes have been tackling the blaze. an attack on the police headquarters in istanbul. one female attacker has been shot and a male accomplice was injured. one police officer was injured during an exchange of gunfire. a turkish prosecutor died as police tried to rescue him from hostage takers. no end to a drought in california after four years. emergency measures have been introduced. governor jerry brown has ordered water usage to be cut by 25%. home's will be forced to install more efficient irrigation

systems. nigeria's president elect has bound to spare no effort in bringing of end to the violence of boko haram. andrew harding reports. andrew: the excitement has not worn off. carrying a coffin to symbolize the death of nigeria's old government and the start of something fresh. general buhari is formally accepting his landslide victory today. he is a military man and will crush the insurgency that has spread misery across northeastern nigeria.

>> i assure you that boko haram will end the reign of terror. andrew: in some of his first comments as president elect he said that nigeria has a bigger enemy than terrorism. corruption. do you have a list of names? >> i talked to you about power. -- andrew: do you have a list of people? >> no. i have said i will allow the system to act. andrew: some say it is the system that is broken. the general was once a military

dictator. today he is a changed man, but he wants diplomacy to bring back law and order. those who lost power in the election now fear a witchhunt. your knowledge there was massive looting? >> those are your words. >> your own government has acknowledged that $6 billion was missing from oil revenue. there are not a lot of public officials worried? >> why would they run? this is nigeria, our country not a banana republic. andrew: they're demanding change and hoping to set an example through the continent. andrew harding, bbc news nigeria. laura: the french prosecutor leading the investigation into the french outs plane crash says that any information should be

handed over to authorities. a german newspaper and a french magazine say they have obtained mobile phone footage showing the last moments in the aircraft. >> the path trodden by so many grieving mothers is followed by the airline chiefs of lufthansa and germanwings. their copilot, who is believed to have brought it down deliberately. >> we are very sorry that such a terrible accident could have happened in lufthansa where we put so much focus on safety. we are sorry for the losses that were cured -- that were accured. andreas lubitz told the airline six years ago that he suffered from severe depression during

his pilot training. questions are being asked about how well that information was dealt with and how well the passengers were protected. as investigators continue to pick through the debris, france's magazine and a german magazine published footage of a mobile phone footage shot by someone on board during the last few seconds on the flight. >> you can see people on their seats with their belt. you cannot identify them because the guy who is filming is filming from the back of the airplane. the sound is terrible because people are screaming in different languages. it shows that they are feeling that they are approaching death. >> details like these are unlikely to comfort the families

of those on board. in the germantown today a memorial for 16 local schoolchildren killed in the crash. they were on their way home after a school trip to spain. for those they left behind, the long process of mourning his beginning in mid-painful uncertainty of how this happened and who may be to blame. lucy williamson, bbc news, paris. laura: you're watching bbc world news america. still to come the leader of hamas speaks to bbc laming the prime minister for killing the peace process. the laptop used to store top-secret documents leaked by nsa flows -- nsa whistleblower edward snowden is on display in london. the name edward snowden has become instantly recognizable. the device behind his leaks were here at the albert museum.

a macbook air computer. a little bit worse for wear because the guardian newspaper that published all of the leaks was instructed by british intelligence to smash it apart. there are 17 pieces that are part of an exhibit. they went through links to break this apart? >> to learn more about how they were instructed to learn more about how they were attracted to damage the data. there were specific parts that had to have the serial number removed or the data is a clear removed. for me it was interesting to learn that there were so many components within the computer that potential he hold data. you can see the trackpads which moves around the cursor. even that is damaged. laura: what you hope to achieve

from the exhibition? >> we are interested in the public realm. it is one of the things we collect. it is often intangible or invisible. this computer is the intersection between the physical and invisible. it is the best way to communicate ideas of privacy and freedom of expression. that is one of the reasons we are delighted to have it. laura: as karen points out there hoping to provoke debates about technology, information, and how it is stored. it is on display until july. laura: a political leader of hamas says the group is expecting difficult times following the reelection of benjamin netanyahu. speaking to the bbc they

condemned the actions of other jihadi groups that they say where acting against the teachings of islam. >> before the damage left by last summer's fighting in gaza is repaired, the next war is on the agenda. this feels half world away from dover where he was in that style. he picked up on president obama's anger over benjamin netanyahu's lurch to the right. >> even in the eyes of the americans and europeans benjamin netanyahu is the most extreme leader and the one who likes to shed blood must. that is why we are expecting difficult times with him. we are not looking for escalation, but we will defend ourselves. >> israel has fenced gaza.

hamas opened another front underground. before i traveled, the lieutenant colonel of the israeli army took me into a section of a captured hamas tunnel. >> you can see the engineering. it is manufactured. hamas says the tunnels were part of a defense and military targets. israel calls them terror tunnels. to back up attacks that showed disregard for civilian lives. this is not a game. he did not try to deny itdoha. r -- we will not stopped arming and preparing ourselves to defend ourselves. we are engaged in defenses

against occupation. >> the activities of the muslim brotherhood allies, like yourselves and hamas, they are being overshadowed by the growth of jihadist groups. the islamic state, al qaeda, and the like. >> we are an active resistance with a just cause. we have a moderate ideology and open mind. others practice violence under the name of jihad, which we condemn. this is not jihad. >> there plenty of people who would laugh and they heard you say that hamas is a moderate organization. that is not how they describe you. >> the ones who are laughing at our logic, they should laugh at mondello, george washington and the american revolution. the people of the world have been liberated from occupiers.

hamas is doing the same. >> hamas and other tunnels in israel with its modern forces will go to war again if there is no political progress. the challenge for the powers who are already confronted by the other middle eastern wars is at the least to keep the palestinians and israelis quiet. that probably will not happen. jeremy bowen, bbc news, though -- doha. laura: the 100 year anniversary of the great migration. african-americans went from the south to the north. it was captured by young black artists like jacob lawrence. his work is displayed in the new york museum of modern art.

♪ >> we had apartheid in this country. people were not leaving the south because of jobs in the north. they were leaving the south because of the humiliation and violence of jim crow. they were doing what so many people have done in the history of the united states. uprooting their families to feel safe and free. jacob lawrence was an artist who emerged out of harlem of the 1930's. when lawrence made these panels he was a young man. 23 years old. he set for himself the task of telling the story of his people in an epic way. 60 panels in a row with the captions. ♪

>> he told the story of the great migration. between 1915 and 1970. 6 million lack citizens moved upwards out of the south. that movement was one of the greatest demographic events in the history of the united states . it thoroughly transformed american culture. some of the scenes in the migration series have great tenderness and intimacy. images of a woman reading a letter in bed to a young child. that is mixed with incredibly stark forthright images about the fact of racial injustices. images of injustice done in court, images of the capricious arrest of black men. images of lynchings. ♪ >> there were over 4000

lynchings between the beginning of the century and 1950. billie holiday in 1930 nine, sang the song "strange fruit." you have cultural figures using the stage to make broad appeals. to pay attention to issues of race. lawrence understood that in this moment in time he could use culture to cast a spotlight on the issues that plagued american society in 1941, and still plagues american society today. laura: images of the great migration are bringing today's broadcast to a close. you can find more on our website. you can reach me at most of the

team on twitter. i am at laura trevelyan. 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. and mufg. >> they say the oldest trees bear the sweetest fruit. at mufg we have believed in nurturing banking relationships for centuries, because strong

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captioning sponsored by newshour productions, llc >> ifill: indicted. new jersey senator robert menendez faces charges of corruption. good evening, i'm gwen ifill. >> woodruff: and i'm judy woodruff. also ahead this wednesday: iran nuclear talks drag on past the deadline. progress made, but still significant work needed to get a deal done. >> ifill: in a first for california, mandatory water restrictions. we talk with governor jerry brown about the drastic steps he's taking to curb the state's historic drought. >> woodruff: plus... >> i cannot move or turn over in bed. in fact i am a prisoner of my own body. >> woodruff: canada's supreme court rules citizens have a