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[applause] >> and now, "bbc world news." jane: this is "bbc world news america." reporting from washington, i am jane o'brien. dramatic new footage shows the moment a dam collapsed at a mine in brazi at least 110 are dead and many more still missing in the wave of destruction. >> the question evyone here is stunned by is how in a big, modern, growing econhis could ever have been allowed to happen. democrat jumps into the presidential race. senato convince voters he is the right candidate to take on president trump. sen. booker: the people i admire

are the people who lead by calling out the best best in who are and not the worst. jane: coming out of the deep freezete -- afr days of dangerous temperatures, chicago is looking forward to thawg out. welcome to our viewers public television in america and around the globe. dramatic footage has emerged showg the moment a dam burst in brazil last week, releasing millions of tons of mining waste. 110 people are known to have died, but more than 250 others are still missing. now serious questions are being asked about how this tragedy and been -- havet has been allowed to happen. our science editor david shukman has traveled to the site in the southeast of brazil and sent this report. loud offirst, a long dust. then a nightmare vision of an unrelenting torrent of sdge. the waste of decades of mining

racing towards hundreds of suspecting people down below. the catastrophe unfolded over -- a week ago, but only now has this video come to l tht, adding to sense of loss and outrage. diffict for you. lthis red cross volunteerds me to the edge of the disaster zone. >> six bodies. david: he alone has found six bodi. any hope of reaching survivors in thiendless sea of mud was quickly dashed. emergency woers are now scouting for any signs of bodies from the air, and ey are pickingir tay over this horrific landscape. we spotted this search team with a sniffer dog in the distance. by the time the wall of mud rich -- reached this point, it had already overwhelmed the cafeteria where the miners were having lunch and destroyed the offices of the mine itself a befoiving here, tearing

e rough a hotel before surging on over that bri the distance and down into the valley beyond, where it caused yet more destruction. hthe question that everyoe is the stunned by is how in a big, modern, growing economy, this could ever have been allowed to happen. investigators are now scene. the dam holding back the waste was owned by one of the world's largest mining companies. it was inspeed only last year. we find a local man praying for friends lost in the mud. "unfortunately," he says, "someone just thought about himself. he didn't protect the dam properly. after years and years, that ha now been revealed." a special mass seven days since the disaster. there is grief and anger, andde thnd for answers will only grow.ma david sh bbc news, in brazil. jane: the u.s. has announced

plans to pull out of a control treaty with russia after what it calls clear violations. the cold war-era pact bans both nations from short and intermedte range land missiles in europe. but the trump administration announces that a new russian cruise missile violates the agreement, and nato says it fully suppor the withdrawal notice. here was the u.s. secretary of state earlier today. secretary pompeo: russia has jeopardized the united states' security interests, and we can no longer be restricd by the treaty while russia shamelessly violates it. if russia does not return to full and verifiable compliance with the treaty within this six-month period by destroyingin itviolating missiles, the treaty will terminate. there.ike pompeo for more on the implications of the announcement, i spoke a brief time ago with jeffrey edmonds, who served as director for russia on the national security council in the obama administration he is now at the woodrow wilson center.

thank you very much for joining me. ere is broad internation consensus that russia has been noncompliant for years. why is the u.s. pulling the plug now? jeffrey: i think what you're seeing is the culmination of many years of trying to confront the russians abo their violations and coming to the realization that this treaty is no longer beneficial tg us, not keep safe. russia is producing battalions of these missiles and we are nstrained in matching the capability. jane: who are they a threat to?c th't reach the u.s. jeffrey: they can't, but they can reach our allies.er they caninly reach our allies. if it threatens our allies, it threatens our natiteal security sts. jane: but what is the benefit of getting rid of the treaty rather than trying to improve it? jeffrey: several things. we have tried to talk to the irussians about coming bao compliance. but at it really does is it frees us up. one of the consequences of staying in the treaty is that it undermines arms-control.

i understand there is a big history behind this treaty. many see it as a cornerstone of peace following the end of the cold war. but it is not really in practice existing anymore with the russians violating it. it gets in the way of any further arms-control we want to inrsue. jane: you are taabout arms control, but isn't there a danger that it could start an arms race? jeffrey: several things about an arms race. insofar as this is a race, the russians are already racing and we are kind of standing on the starting line. i would be cautious, i wouldn't be hyperbolicar and overly st about an arms race. it is not as if russia has a giant capacity that it will suddenly bring online and produce millions more missiles. i don't think ththe case. but i think there is the concern that we will need to take steps, we need to be very cautious and take into consideration our allies' concerns over these weapons if that is the course we purs. but one thing we need to look at -- not just producing weapons. i think you up and -- europe and the u.s. need to spend more time

and resources looking at missile-defense capabilities and point defense. protecting critical infrastructure and things like that. jane: do you think the u.s. is also concerned that iran and china are not bound by any treaty? jeffrey: i think it is a concern. i think their capabilities are concerned. i have not seen any evidence -- i spoke to others in the administration when i was there -- this china issue was never the driving factor behind our negotiations and stance on inf. that being said, leaving inf does give us the freedom to develop new capabilities thatr might counan and china. jane: thank you very much for joining me. thanks for having me. jane: venezuela's opposition leader juan guaido is calling for the biggest mass protests in the nation's histasy this weekene tries to force president nicolas maduro from power. the opposition are demanding new elections end the chaos engulfing the country. human rights lawyers told the bbthere has been a wave of political unrest with almost 1000 people detained in recent

days. the government denies it tortures prisoners, but as our international correspondent or erin heard a harrowing account of one woman who said she was beaten and abused. you may find some of it upsetting. orla: under darkened skies,it caracas some here hope for a modern-day liberator to replace president nicolas maduro. but those who dare to oppose him can expect to pay a price. almost 1000 people have been detained in the past 10 days. we are on our way to meet one of them. she is a young woman who we cannot identify for her own safety. she has just been released, and she has a harrowg story to tell. she says she was held for 8 days in this building, the headquarters of the military police. they interrogated her about a relative, a military officer suspected of plotting against

e president. >> they tortured me, they put a plastic er my face and choked me. then they put my head in a bucket of water to try to drown me. i fainted, and they beat me to wake me up. they put a gun in my mnd cocked it. they said they wanted answers fast, anthat they love to see people suffer. their boss tolthem all to rape me. they lifted my shi and took off my bra and touched me. orla: did you think you might be killed? >> yes, because they were constantly saying it.th said they were going to kill me and throw me in the river.ai they "we are the government, and nobody can do anything against the government."

orla: a leading human rightsgg lawyer is stng to keep up. he says the government is in overdrive trying to silence dissent. >> now we can talk about generalized persecution, generalized detentions. they detain anyone to intimidate people and produce what they are producing, this fear of inotesting. that is what is on. orla: but some, like federica, a politics student, are determined to keep up the fight. she says being a mother to a six-month-old means she has toes prot >> this is for her. before i had her, i felt invincible and did not care. now that i have her, i am scared to go out, i'm terrified. ht this is absolutely for.

she is the next generation of this country, and they are the ones who are going to hold this country up. orla: federica is preparing to go back out on the streets tomorrow, at a mas demonstration called by the opposition. gas mask at the ready. orla guerin, bbc news, caracas. jane: we will of course be onpaying close atteno those protests over the weekend. in other news, hundreds of people in pakistan are protesting the acquittal of christian woman asia bibi. y . bibi had been sentenced to death for blasphem a high-profile case and spent 8 years on death row before her conviction was overturned last october. a legal challenge to her acquittal was launched, but the supreme court has rejected it. the democratic field to take on president trump in the 2020 elections is getting more crowded by the day. the latest entry is senator cory

booker from new jersey. he is the fourth senator on the list of caidates and second african-american. he hopes that a message of unity will set him apart. sen. booker: in america, we have pain, but will we are lacking is a sensee. of common pu jane: cory booker, the charismatic senator from new jersey, has been positioning himself for a presidential bim for some t like many of his rivals, his official declaration has come early. me portrays himself as somebody who can bridge aca's political, racial, and economic divides, making his al pitch outside his home in a low-income neighborhood. en. booker: i believe in american people. i believe they will look to the democratic party for leadership. i belie we are going to consolidate in this country against the politics of hate, politics odivision. jane: in a crowded field that now includes four senators, name recognition is key. the candidates wl make their

desk for the differees. kellyanne: i imagine that the crowded democratic field of democratic aspirants will be attacking each other's records, oreack thereof, and we will sitting back with copious bowls popcorn watching that. jane: but booker, who hasci made l rights the e cornerst his career, shows no signs of mudslinging, at least not yet. sen. booker: how's my hair? anything hanging out of my nose? that is a real friend that tells you the truth. jane: that is booker with senator kirsten ofllibrand, one he record number of women selling her hat into -- throwing their hat into the ng, and one of the first to congratulate him. sen. booker: i am cory booker. i am kirsten gillibrand's -- one of her bwat friends in ington. jane: there are others waiting gs -- the three b's, beto o'rourke, bernie sanders, and joe biden. the former vice president has yet to declare, but he is the 800-pound gorilla in the room. he is known, he liked, and he is moderate. in a showdown with donald trump, that might give him the ed.

for more on the expanding race i spoke a brief time ago with josh kraushaar of "national journal." thanks very much indeed forin g me. let's start with cory booker. hope and optimism, is that thede messagcrats want to hear?e josh: that is g question. a lot of democrats are sounding very pessimistic notes. elizabeth warren is pessimistic about the economy and income inequality. a lot of the candidates have a very pessimistic vie racial relations and believe there is not a lot of progress being made. cory booker's message and video was as optimistic as it gets these days. it showed that he is someone who worked from the bottom and became a successful mayor of newark, new jersey, and now is a prominent u.s. senator. optimism usually sells politics. the big challenge is that with so upset, can that work in 2020? jane: the white house rubbing it hands in glee about the credit -- about such a big field because they will have to be brutal about the differences. how are they going to do that?

josh: get your scorecard, because y candidates running.f the big question that will shape the contours of the primary -- does joe biden run? joe biden has 100% name id as vice presidentdijust a comman figure in the democratic party. he would not necessarily be the the front runner because he has a lot of baggage -- he is older and is not where the energy of the democratic party is these days. but he would reshape the strategy of the candidates. but if biden runs, more people will get to his left. if he doesn't, there is more opportunity for a mode booker to win votes like that way. jane: do we know which direction the democrats are likely to veer? josh: theyre moving to the left, and a lot of the positions that hillary clinton did not embrace, f like medica all, socialized health care, banning private insurance companies, which many candidates have entertained on the democratic side, that has shifted dramatically in the last two years.

ra economic issues, democrats are much more liand progressive. on racial issues, just the pessimism that insteading one big melting pot, one inclusive country, there is a lot of belief out there that no one can work together and you ha to divide along racial lines. booker's message was important because it showed a different way r democrats to talk abou race. jane: who should donald trump fear the most? josh: he said in an interview with "the new york times" that he was very pleased that she --he washat heug tho very pleased, he thought kamala harris did a good job with her kickoff. tothey view seharris as a formidable candidate. booker will be in that top-tier and if biden runs he will be a very, very serious candidate. you have to lookrrt elizabeth playing in that -- bernie sanders is also running, but playing in the economically populist lane. it seems to have a lot of buy-in. ne: early days, how long can joe biden wait before he declares? josh: he doesn't have a lot of time, because look at the

attention everyone else is getting. being wellnown only takes you so far. he has to hire staff. there is competition for the best talent in the democratic party. he cannot win a whole lot longer. yet he cannot wait to hold hcannot wait a whole lot longer. advantages with his nam and celebrity but he will have to decide if he isunning and ise money fast. jane: joshks kraushaar, tho much. already shaping up to be an interesting ratc. you are wahing "bbc world news america." still to come, 40 years after ayatollah khomeini returned to iran, we look back on the day that changed history. the funeral for one of south korea's most prominent world war ii sex slaves as been held in central seoul, with many treating the service as a protest against what was seen as

pan's failure to properly address war crimes. 93thear-old died on monday. aporter: yellow butterflies, symbol for south korea'sso formr -called comfort women. shundreds took to theeets in seoul to march past the japanese embassy alongside the hearse. at 14, she was forced to work as a sex slave for the japanese utlitary, and in recent decades the came one of korea's most prominent campaigners for all women abused durin war. president moon paid his respecte at the funerlier this week, after she lost her battle with cancer. carried banners anking her for devotion to the cause and calling on japan to atone for its actions. >>nk i tniversity students and the younger generation in south korea should work harder to get legal compensation and an officiale apology from

japanese government. reporter: in 2015, tokyo apologized to the victims and provided9.2 million to a fund in seoul. she and other comfort women were vocal critics of the deal and said that the apology was not sincere because some japaneue leaders conto deny that women were forced to work in brothels. but japan says the claims had been settled. >> the view of abe's cabinet on the comfort women issue has not changed. as for the farewell ceremony, it will be questioned if the intention was to disturb the ace of the embassy in south korea. reporter: with the death from only 23 registered survivors are still alive. many will continue to fight for the cause she championed. jane: people in the frozen

midwest can breathe a sigh of whief as the polar vortex has crippled the region finally starts to let out. -- let up. for many it is the first time they have been able to venture outside for days. as chris chicago, the warmer temperatures, while welcome, may bring new problems. chris: the city of chicago is getting back to normal. it is bustling today and people are getting back to work, although truthfully, some of the people i have been talking to have not been out of the he se sist weekend and it is the end of the following week. they have been inside for six days because of the sheer cold of the ice and snow and temperatures droppiug to -30 ce it is much warmer than that today. it is still -10 celsius. but take a look towards thet start of nek. they come to +10, +12 celsius. that is much warmer, and that rapid thaw could lead to problems. to give you an idea, if you just

isrn around, you see that is lake michigan. it is just completely covered in this ice and snow, sheets of ice on the very top of it. it gives youn idea of why in some places they are all worried about potentially flooding in the days ahead. there are concerns about potholes in the road, and beyond that, they are also worrd about water mains worst thing that water mains -- water mains bursting. in chicago itself last night, commuters were making their way home, all number of commuters who went to work yesterday, they were covered in water because one of the sprinkler pipes burst and there could be more of that to come. there is danger of another cold spell in a couple of weeks time. it is unlikely to be as cold as this. this has been called the coldest in the generation. jane: brr. chris buckler there. 40 years ago ayatollah khomeini tourned to his native iran

establish a revolution. iran's ties to the west were radically changed and the ayatollabecame the supreme leader of the new islamic republic of iran. our world affaireditor john simpson was on that flight from paris to tehran with the ayatollah and witnessed the revolution unfold. wjohn: it a key moment in modern history. under the shah, iran was increasingly westernized, butst its vail wealth brought corruption and social upheaval, and that led to a year of wolent demonstrations. ayatollah khomeias in exile in france. he was implacable -- the shah must go. soon the shah was forced to escape abroad, a bron dying of cancer. throughout the revolution, a young diplomat in the british embay. >> when we were in the middle of all the events of the collapse of the old iran, neither we nor really anybody else knew what it.going to come out i don't think many iranians knew

what they would be seeing over this timescale. john: on khomeini's flight back to iran, i asked him what he was feeling. he ignored me. a moment later, someone else asked the same question. "nothing," he said. his return was a huge defeat for the west and a massiveoost to islamic fundamentalism. ev today, the pictures are still extraordinary. these were the crowds outside. people say it was the biggest crowin human history. it was certainly a couple million, maybe 3 million. there was a great owdown thebrief showdown betwee army and the demonstrators a few days later. i watched as the victorious crowds trashed a secret police headquarters. e policeman's uniforms, even the files they find inside had

been scattered to the wind, and the demonstrators are in complete possessioin ever s, the clerics have ruled iran, clamping down in lerticular on women's rights. the only real chale to them came in 2009 after a disputed presidential election. it was called the green d revolution, and it rockee religious leadership. buit was put down savagely the bbc's persian service is banned in iran, but millions watch it anyway. one of its prenters. >> there is appetite for change, but because there is nobody to mobilize the yth who want change, i can't imine another revolution happening despite widespread corruption. john: its economy is troubled, but modern iran can be surprisingly relaxed and pleasant. still, people are scared to com out againse government, and that has kept the system going for 40 years.c

john simpson, ws. jane: that is it from us. i'm jane o'brien. thanks vy much for watching "bbc world news america." have a great weekend. >>rith the bbc news app, ou vertical videos are designed to woso around your lifestyle, you can swipe your way through e news of the day and st up-to-date with the latest headlines u can trust. download now from selected app stores. >> funding of this presentation is made possible by the freeman foundation, and kovler foundation, pur solutions for america's neglected needs. >> what are you doing? >> possibilities. your day is filled with them. >> tv, play "downton abbey." >> and pbs helps everyone discover theirs.

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caioning sponsored by newshour productions, llc oo >>uff: good evening. i'm judy woodruff. r the newshour tonight: >> we can no lon restricted by the treaty wle russia shamelessly violates it. >> woodruff: the trump administration suspends one of the last major nuclear arms deals with moscow. then, tang on the middleman. a conversation with secretary of health and human services alex azar on the push to drive down the .ice of prescription dru and, it's friday.ma shields and david brooks are here to talk about the divide over a border wall, the split between the president and his intelligence community, and some of the democrats flocking to run for the white house. plus, gordon parks on display at the national gallery of art.th a look aformative years of a major 20th-century photographer.