this is bbc news. the headlines: london has become the first city in the world to introduce an ultra—low emission zone in an effort to improve air quality. drivers of polluted vehicles, from motorbikes to lorries, coming into the centre of the city welcome to bbc news — broadcasting to viewers in north america and around the globe. will have to pay to enter the area. my name is lewis vaughanjones. our top stories: president trump is replacing his homeland security secretary. striving for cleaner air kirstjen nielsen says she has resigned with immediate effect. in the city streets. anger has been growing within the white house at the failure to reduce the number london becomes the first in the world to charge drivers of migrants entering the us of polluting vehicles illegally across southern border. to use its roads. president trump announces he's replacing the woman in charge of his border policy. and the un—backed government in libya says more than 20 people have been killed in four days of fighting around the capital, the secretary for homeland security, kirsten nieljsen, says she's tripoli. resigned with immediate effect. the un—backed libyan government says more than 20 people have been killed in four days of fighting around forces led by a warlord the capital, tripoli. are trying to seize the city, in defiance of international he's the king of bollywood. sha rukh khan tells the bbc what he thinks about gender calls for restraint. inequality in india.

the world's first ultra low emissions zone has come into force here in london. it's seen as one of the most radical anti—pollution policies in the world. polluting vehicles — from motorbikes to lorries — will pay a charge to drive into the centre of the city. and with air pollution in our cities such a big problem, will other countries follow? tom edwards reports. this is the clean air choir, organised by mums who support the new ultra low emissions zone. pollution is a worry. we all need to think what impact air pollution is having on our children right now, on all of us. and road transport is the major source of air pollution in london. on this map, red and yellow show the high levels of pollution near roads. older, more polluting cars will have

to pay to enter central london, with the worlds‘s first ultra low emissions zone. petrol vehicles over 1a years old and diesel vehicles over four will have to pay the charge — £12.50 every day — and it runs 21w. motorbikes and hgvs will also have to comply. and the best way to check if your vehicle is compliant is to go on the tfl vehicle checker. it'll cover the area inside the congestion charging zone, but from 2021, it'll expand to roads inside the north and south circulars, taking in thousands more vehicles. the ulez is a first step, but it's a tiny bit of london. it needs to be much, much bigger, it needs to go beyond the north and south circular. no one should be left out of the clean air zone. the mayor said his scheme was necessary. this is an issue of socialjustice.

it is unacceptable in the world's greatest city, we have children in the poorest parts of london who are suffering the worst air, who have permanently undeveloped lungs. and it's the poorest families who own the fewest cars. expanding the zone will face opposition, but supporters say tomorrow is a crucial step forward in cleaning up london's air. tom edwards, bbc news. earlier, i spoke to simon birkett, founder and director of clean air in london, and i asked him how big of a problem are these polluting vehicles in our cities? well, i think the context for this is that air pollution is the largest environmental health risk, killing about 7 million people a year. now, this ultra low emission zone entering into force today is targeting the most polluting vehicles in the most polluted place, which is a sensible approach, but london's problem is primarily diesel and that's what this is focused on. and so, how effective can this be? what kind of difference

to the quality of our air in london here will this make? well, it could make the difference between london's air complying with world health organisation guidelines or not, and we've seen some real progress over the last year, but what the mayor estimates is that this measure will reduce by about 15% the number of road links in central london which will be breaching the world health organisation guideline. and we can see, i think, we'll take a look now at this map of the area, but i'm interested, this is london, this is a very concentrated area right in the middle of the city. how effective will this be for other cities around the world and do you think they will have any interest in copying this? well, europe has a diesel problem. diesel has been a public health catastrophe for europe, and the mayor is taking a lead here in tackling diesel pollution, so i think there's going to be a lot of interest in europe and more widely. there's a particle problem in china and india, and eastern europe, but we have a diesel problem.

what we expect is that this will actually reduce concentrations of nitrogen dioxide, and it's been very well supported by members of public. lots of people — well, i'm sure most people obviously — will want to tackle this problem, but there are those concerns that this actually can end up penalising poorer people, who can't afford to go out and buy a brand—new car. well, i think that's a fair question to ask. the poorest people, of course, do not have cars, don't even havejobs often, and i think there is an intergenerational issue here, which is that the children who are exposed to this pollution are going up with small lung size, reduced lung capacity, which of course, they never get that back for the rest of their life. so by targeting this measure initially on a small part of london, let's call it 6% or 7%, it will have collateral benefits, that is what we have seen in other cities,

and the mayor is going to expand this in 2021 to a much larger area, but what we would like to see is a bigger, stronger, smarter scheme, which really covers the whole of london. is your final aim though to reduce the number of cars on the roads? this is a pollution measure, it's not a congestion measure. this is an important step on the path to banning diesel from london, and diesel is carcinogenic, it's a very serious problem and it's an important step on the pollution path, it's not a congestion measure. simon birkett there. next, president trump has announced that he's replacing his homeland security secretary, kirstjen nielsen. the president thanked herfor her service, but gave no immediate reason for the change. mr trump said kevin mcaleenan would take over the job in an acting capacity. cbs correspondent errol barnett sent us an update from washington. president trump confirmed the ouster of his secretary of the department of homeland security sunday in a series of tweets, and rumours of kirstjen nielsen's ouster had percolated many times before.

this time, though, it's serious, and it seems to follow a weekend in which president trump has bolstered his positioning on immigration issues. in fact, the outgoing secretary, kirstjen nielsen, was side by side with president trump in calexico, california late last week as the president highlighted newly renovated border wall fencing, some two miles of it. the president also, over the weekend, said the us is full, its immigration system overloaded. one other thing the president has threatened to do in recent days is scrap the united states‘s asylum system along the southern border altogether. now, while it's unclear if that will even happen, it would need congressional approval, it is part of a tougher direction for the president when it comes to immigration and border security issues. kirstjen nielsen, in fact, was grilled by the house homeland security committee in march for a perceived poor treatment of migrant families at the border.

democrats, newly emboldened with their oversight responsibility, have put a spotlight on kirstjen nielsen and her action as the secretary of the department of homeland security. president trump announcing that for right now, she will be replaced by the commissioner of the customs and border protection entity, kevin mcaleenan. he becomes acting secretary of dhs. that was errol barnett from cbs. i'll have more on this story in a few minutes. but first, let's get some of the day's other news. thousands of demonstrators are continuing a sit—in protest outside sudan's military headquarters in khartoum, calling for president omar al—bashir to step down. the protesters chanted slogans calling on the army to turn against the government. president al—bashir has been in powerfor over 30 years and is wanted by the international criminal court for war crimes.

a british woman is facing a possible prison sentence in dubai for allegedly breaking the eminence‘s cybercrime laws with comments she wrote on social media in the uk. she was arrested when she flew to dubai in march, more than two years after she described her ex—husband on facebook as an idiot and his new wife as a horse. the couple lived in the united arab emirates and her comments were reported to police in dubai. us secretary of state mike pompeo has called for an immediate halt to the fighting in libya between rebel forces and those of the internationally recognised government. more than 20 people are reported to have died in the clashes over the last four days and the un has called for an urgent truce, libya has been torn by violence and instability since colonel gaddafi was deposed and killed in 2011. dozens of militias operate there,

linked either to the un backed government, under the prime minister faiz al—sarraj, which has struggled to assert control, or the rebel libyan national army, led by general khalifa haftar. since thursday, it's advanced on the capital, tripoli. our diplomatic correspondent james landale has more. this is a battle fought largely by pick—up truck. makeshift armoured vehicles jamming the routes in and out of tripoli. these belong to militias loyal to the government of national accord, that's backed by the united nations. and they're rushing to defend the capital. a government spokesman insisted they had slowed the advance of rebel forces. translation: on this day, the libyan armed forces declare the launch of the operation, volcano of anger, to purge all libyan cities of aggressor and illegitimate forces. these are the aggressive forces he's talking about, from the so—called libyan national army — the loose alliance of armed groups

that control much of the east and south of libya — here preparing for battle at their benghazi headquarters. today, as these forces continue to head west, there were clashes south of tripoli, particularly around the disused international airport. and there were also reports of air strikes by both sides. the un mission in libya called for a short truce to evacuate civilians, but was ignored. the government said 21 people have been killed and 27 wounded. so, why does the crisis in libya matter? well, ever since western forces helped depose colonel gaddafi in 2011, libya has been gripped by violence and political instability. the un has attempted to broker a political deal between general haftar and prime minister sarraj, but so far, it's failed, and the fear among western governments is that full—blown civil war could mean libya once again

becomes a source of migration and extremism on europe's southern flank. haftar clearly believes that there's a military solution to this conflict. he believes that if he captures tripoli, he doesn't have to negotiate politically, but this is a big gamble, and it's certainly unclear whether it's going to be successful. at the moment, it's in the balance, but it looks like it's unlikely for his forces to succeed. some countries are now acting to protect their nationals. these unverified pictures appear to show the united states evacuating some of its forces by hovercraft. eu foreign ministers will discuss the crisis in brussels tomorrow, but few expect the fighting to end soon. james landale, bbc news. in the week that indians go to the polls, pakistan has worn its neighbour not to launch any new

attack after saying it had reliable new intelligence that one was being planned. india has denied the accusation. in the meantime, pakistan says it has released 100 indian prisoners. most of them are fishermen who were convicted of straying into pakistani waters. the day has finally come for these fishermen. they are going home. pakistan released 100 indian fishermen as a goodwill gesture, the fishermen as a goodwill gesture, the fishermen formed the first batch of 260 indian prisoners practised said it will release this month. they we re it will release this month. they were convicted of straying into pakistani waters. understandably there was a huge sense of relief. translation: i'm very excited to be going back to my home country after 17 months. i am so excited to see my pa rents, 17 months. i am so excited to see my parents, my brother, my sister, my whole family. but on the same day,

pakistan's foreign ministry also accused india of planning an attack later this month. it says it has reliable intelligence. translation: recently, the cabinet committee on security was held, which was chaired by indian prime minister narendra modi. heads of the armed forces, who participated in the meeting, said we are ready for action against pakistan. pakistan's foreign ministry said ambassadors of the permanent members of the un security council in islamabad had been alerted about the situation, but india denied it was planning an attack. it described the accusation as irresponsible and preposterous. an indian foreign office spokesperson said pakistan had a clear objective of whipping up war hysteria in the region. the two countries came close to war in february after a suicide bombing in indian administered kashmir that killed 1:0 indian administered kashmir that killed a0 indian troops. pakistan

has always denied any responsibility for that attack, but india responded with airstrikes on its neighbour's territory. soon after, pakistan shut down indianjet. territory. soon after, pakistan shut down indian jet. we territory. soon after, pakistan shut down indianjet. we 900 million votes up to grab india's collections, which start later this week, all eyes will be on help prime minister narendra modi reacts to the pakistani accusations. —— how. stay with us on bbc news, still to come... we'll hear from the man who has just completed the longest journey in an electric car, through a total of 33 countries. 25 years of hatred and rage as theyjump up on the statue. this funeral became a massive demonstration of black power, a power to influence.

today, it's about the promise of a bright future. a day when we hope a line can be drawn under the bloody past. i think that picasso's works were beautiful, they were intelligent, and it's a sad loss to everybody who loves art. i think that picasso's works were beautiful, they were intelligent, and it's a sad loss to everybody who loves art. this is bbc news, the latest headlines: london has become the first city in the world to charge polluting vehicles for using its roads. president trump announces he's replacing the woman in charge

of his border policy. the secretary for homeland security, kirsten nieljsen, says she's resigned with immediate effect. let's get more on that story now. eric ham joins me from washington. joins me from washington. this should come as no surprise to many. when former white house chief of staffjohn kelly resigned at the end of 2018, kirstjen nielsen's days we re of 2018, kirstjen nielsen's days were numbered. she was her only champion inside the top administration so there was little doubt that she was actually on the chopping block but what is striking about this is you now have a president who has an acting secretary of homeland security, and acting white house chief of staff — free of the most consequential

positions in any presidential administration and what this does is create a greater and growing concern of more chaos and instability in the white house. you said she was on the chopping block, always destined to be pushed and if that wasn't the case, why? you have to understand, president trump's biggest campaign issue was actually building a border wall and keeping migrants from the southern border out of the united states and, unfortunately, he was unable to get the money for the wall and we still see a growing number of refugee migrants fleeing from central america coming into the united states and, unfortunately, he simply was not happy with kirstjen nielsen's ability to secure that border. she was raided by the president is at a meeting and so she

has just been a key cabinet member who has been in the firing line of this president for quite some time. it is also important to know that one of the president's closest and most influential senior advisers, mr miller, simply was not happy with anna jared kushner, the president's son—in—law also waded. the knives we re son—in—law also waded. the knives were out and it was only a matter of time before she was on the way out. what do you think happened next? does donald trump double down on his border policy? we have seen the president moving in that way. recently the president withdrew his nominee to head the immigration customs force. in addition, the

president is still looking for money for the all and seeking to move into a campaignfooting. for the all and seeking to move into a campaign footing. —— wall. he will have to nominate someone who can actually get through a contentious nomination battle and that is going to be very difficult especially considering you have a number of members in the us senate also looking for re—election effort so this issue of immigration and the border wall now becomes front and centre at the time when you have key candidates running. running for president who i think and speak clearly to this issue. now the president is on the defence. great to have your thought. thank you. let's get some of the day's other news:

women and children are being moved from flooded areas in you run wild man are being asked to stay. -- iran —— iran carrying pets and placards animal rights protesters protested. some say it shows that authorities are becoming more open to the public expressing their views. a rally outside the prison where the former brazilian president is being held. he was imprisoned over allegations of corruption. he's the bollywood star with millions of fans around the world and now shah rukh khan can also boast an honorary doctorate from the university of law in london.

it's to honour his work in philanthropy. in an exclusive interview with the bbc, the star says gender inequality in india is narrowing and that he's seen a positive change in the film industry since the me too movement began. bbc asian network's shabnam mahmood reports. known as the king of bollywood, shah rukh khan is one of indian cinema's biggest stars and one of the highest—paid actors in the world. more used to receiving film awards, he's now being given an honorary doctorate for his work in philanthropy. thank you very much. genuinely, i want to live to be 100 years so that i can... now i'm 50. ..i can dedicate the next 50 years doing something worthwhile. and, you know, when i meet people around the world, i meet some youngsters, some old people, they will turn around and they say, "you know what, yourfilms make us happy." and that is very encouraging but i want to make people

happy now, personally. over the years, he's championed equality for women. so, have things changed in the industry following the "me, too" movement, which saw women standing up to sexual harassment globally? the roles of women and the kind of attitude that you have at workplace for women is changing for the positive. but i think overall, when i see some of the actresses get the kind of roles, and even salaries, which i think should be even more equal than it is right now, i think it's very heartening. however, there are some things shah rukh khan feels don't need changing, like the film censorship laws in india. you know, there are going to be issues between creative people and what they want to say, but i would say that no filmmaker wants to disturb the sensibilities of the audience. but i don't think any law or rule is outdated, i think of course you'll have to keep on refurbishing them, and people are changing, the society is changing, but culturally, i think we are a very strong nation. and i think that needs to be respected always.

the bollywood superstar has made around 80 films over the last three decades. is it time now to take up more senior roles? my next role will be as sexy as my last one. so, you want me to be a sexy father, sexy hero, whatever you want me to be. shabnam mahmood, bbc news. the world's longest electric car trip has just come to an end in sydney, australia. the bbc‘s tim allman has more. when you've been on a long journey, this must be quite a sight — a convoy of electric cars crossing the sydney harbour bridge. leading the way, the blue bandit — a vehicle thatjust keeps going and going and going. i wanted to do my bit to promote this technology and do something which really speaks to the imagination which is driving electric car from amsterdam to literally the other side of the world to show

it can be done and why, if i can do it, why can we not use electric vehicles for daily use? # on the road again # just can't wait to get on the road again.# the scale of this trip was immense. wiebe wakker travelled more than 95,000km — that's twice the circumference of the earth. he visited 33 countries in a journey that lasted more than three years. along the way, he relied on the kindness of strangers who offered him food, shelter, and the occasional use of an electrical socket. quite a journey, quite a car. toots horn but one imagines the trip home is likely to be a lot quicker. tim allman, bbc news. get in touch with me on twitter.

this is bbc news. hello there. the weekend brought us some very mixed fortunes in terms of the weather. for many parts, it was pretty cloudy and drizzly, particularly in the north and east. there were some clear skies though further west. this was the scene as the sun set on sunday night in barnstaple, in devon. as we head through the day on monday then, still some mixed fortunes. a lot of dry and fairly sunny weather developing but there will be some rain around, particularly in the south. we've got a slow—moving weather front which is going to be with us for the next few days. here it is. during the day on monday it'll be draped from south—east england through parts of the midlands, wales up towards northern ireland. so it's ths zone that will stay quite cloudy. first thing in the morning, most of us looking frost—free butjust a touch of frost, i think, for some of the sheltered glens of scotland first thing. through the day, we keep that weak front,

bringing some cloud and showers from south—east england through the midlands, into wales, perhaps one or two showers getting into southern parts of northern ireland. elsewhere a lot of dry and sunny weather. a few showers for the isles of scilly, perhaps towards the channel islands as well. a little bit misty and murky around some of these north sea coasts, but elsewhere, after a murky morning, the mists should clear to leave plenty of sunshine, particularly for the likes of western scotland, northern ireland and north—west england. temperatures between around about 10—17, so still reasonably mild through the day on monday. monday night and into tuesday then, this weather front sticks around in the south so more of that heavy rainforsimilarareas, southern england, south wales as well. again, it's looking like a frost—free night and we are likely to see some mist and fog forming. also some low cloud just pouring in off the north sea. so some of these north—east north sea coasts could well stay quite murky once again. but lots of sunshine developing elsewhere. but we have got that stubborn front bringing more rain along the south coast of england, into south wales too. and you'll notice, by tuesday, that things are starting to turn a little bit cooler so top temperatures around 9 or 10 across the east of scotland. perhaps 13 or 1a down towards the south—west.

but it will turn colder through tuesday night and on into wednesday and that's because we start to import this air from scandinavia. so an easterly breeze developing and a drop in temperature. by the time we get to wednesday, there will more sunshine for most of us. still a little but murky around some of these eastern coasts and just the remnants of that weather front bringing a bit more cloud towards the south—west. but elsewhere, a lot of dry, sunny weather, light winds too, although temperatures not great for this time of year. many of us, particularly towards eastern coasts, are stuck in single figures. and if we look further ahead towards the end of the week, it's looking mostly dry but still rather cool for the time of year, with temperatures generally around 9—13 degrees. that's it for now, bye—bye.