welcome to bbc news. i'm mike embley. our top stories: hopes grow for a covid—19 vaccine after every volunteer involved in atrial at oxford university shows an immune response to the jab. they are extremely promising, because these are the type of responses that we believe will be associated with protection. president trump says he will send more federal law enforcement officers to deal with protests. local officials say it's an abuse of power. in thejohnny depp libel case, his ex—wife amber heard says she was afraid the hollywood star was going to kill her. and polar bears under threat from climate change — why they could be extinct by the end of this century.

we start with the global race to find a vaccine to halt the pandemic. here in the uk, scientists at oxford university say the vaccine they're developing appears to be safe and does trigger an immune response.the uk government has already ordered 100 million doses of it. here's the bbc‘s fergus walsh. 3131197. so much is riding on this. could the oxford vaccine help end the coronavirus pandemic? more than 9,000 volunteers have received the jab in the uk — among them these frontline nhs staff in newcastle. i've seen what covid can do. the sort of severity of some of the cases has been quite upsetting at times, so i really wanted to try and help get rid of this disease. unfortunately, me dad fell ill with covid, and was admitted

here for eight days. and i think, once it's been that close to home, it makes more of a difference. you feel like you want to do your bit. vaccines work by training the immune system to recognise and remember the enemy — in this case coronavirus. the oxford vaccine stimulates the creation of specialist y—shaped proteins known as neutralising antibodies. in the event of future exposure, these should latch onto the coronavirus and prevent infection. it also stimulates the creation of t—cells, another key part of the immune system. these should sweep up after the antibodies and destroy any cells that have become infected. in the first 1,000 volunteers, the vaccine was safe, and two doses gave a better immune response than one. the oxford team says it is a really important milestone. we're really pleased

with the results that are published today in the lancet, because we're seeing both neutralising antibody responses and t—cell responses that we are optimistic may be associated with protection. but we still need to conduct those trials to prove that that's the case in humans. but we don't know if the vaccine will work in the real world, and protect people from infection. trials have begun in south africa and brazil, both virus hotspots, so the answer there may come sooner than in the uk. so this is very good and is very promising to start with. however, we have seen vaccines reaching this point and also failing, so we need to be a little bit careful, and not quite popping the prosecco just yet. i can fit you both

in at 12:45pm. perfect. these over—70s in southampton are all signing up to receive the vaccine. older people are more vulnerable to covid—19, and our immune system weakens as we age, so whether the vaccine protects them is another key question that needs answering. how do you feel? i feel fine. good. fergus walsh, bbc news. the race is on to find a vaccine and test it within a large enough group. american pharmaceuticalfirm moderna is hoping to enter the final stages of its trials next week. they are ready to administer the vaccine to 30,000 volunteers — the biggest and the most crucial phase of human clinical trials for the vaccine so far. chinese biotech cansino biologics are the first to publish a full scientific study on its early human trials. their vaccine trial produced good antibody responses. but it didn't work as well in people aged 55 and older. on tuesday, executives from five drug companies leading the vaccine race are due at a congressional hearing to talk about their progress in developing a product the entire world desperately needs.

who will get a successful vaccine first and how much might it cost? a little earlier i spoke to dr angela rasmussen who is a virologist and associate research scientist at the center of infection and immunity at columbia university school of public health. so unfortunately, while this data is very promising, it's still too preliminary to make any conclusions about efficacy or about how long that protective efficacy may last, if it exists. that's why these phase three trials coming up are so crucial to determining whether these immune responses for the oxford vaccine, as well as a moderna vaccine, some of the vaccines in the pipeline, are able to generate. that really is the critical question for the entire world, really, in terms of having a safe and effective vaccine that will protect us from the coronavirus in the long run. and i realise from what you're saying that it is early stages,

but at best at the moment it seems that we're talking about not complete immunity anyway, but some kind of protection from the most severe stages of the disease. even that would be a substantial public health benefit, wouldn't it? absolutely, so early monkey — nonhuman primate trials of the oxford vaccine show that it protected nonhuman primates from very severe pneumonia, but it did not completely protect them from becoming infected. nonetheless, it doesn't really matter that much if you're getting infected. it still does, but it doesn't matter as much, if you're not becoming seriously ill. right now, one of the biggest problems we're having here in the united states is the strain that severely ill patients put on the hospital system. if you're able to prevent people from becoming seriously ill and make this into a manageable disease that you will survive, that has a huge public health benefit. what sort of timescale do you think we're talking about at the moment, at best? certainly the phase three trials that have already started, such as with

the oxford vaccine, are taking place in coronavirus hotspots. that makes it much more quickly that you will see a result, in terms of efficacy. i think that we're already planning to speed up these trials to the point where, if we get any indication that this vaccine is effective at reducing disease severity, that vaccine will probably move on to being used in the human population much more quickly than a vaccine normally would. that said, we need to be cautious and manage our expectations, because we really don't know how long that is going to take. i would say that at the earliest, we will probably have a vaccine in late 2020, if everything goes perfectly. briefly, if you don't mind, what are the chances of getting people to take it, given the resistance there's been even to masks? i think that's been a real challenge. we have a lot of problems

with convincing people to adhere to basic public health measures intended to protect people. i think personally, what i plan to do is be first in line to get the vaccine as soon as i can, to try to set a good example for public health. i think that we really have a lot of work cut out for us, though, in order to win hearts and minds, to convince people that this is safe, that the coronavirus is something real that we need to protect ourselves against, and to get everybody on board with achieving herd immunity, which is what we're looking for, with a minimum amount of deaths from disease. let's get some of the day's other news. the british foreign secretary has suspended the uk's extradition treaty with its former colony, hong kong, immediately and indefinitely. the announcement includes an arms embargo, and is a response to china's imposition of a new security law on hong kong. dominic raab called that a clear and serious violation of thejoint declaration between china and the uk. syrian state media is saying air defences have intercepted a number of israeli missiles over damascus. the syrian military says most targeted the suburbs of southern damascus which israel has hit in the past.

seven syrian soldiers are reported wounded. there was no immediate israeli comment. a man found dead in a car in new york state is being investigated as the possible suspect in the deadly attack on the family of a us federal judge. esther salas was unharmed after sunday's shootings, but her 20—year—old son was killed and her husband was critically injured. the wearing of masks in indoor public spaces is now compulsory in france. there is a penalty of more than $150 for failing to wear a face covering in places such as shops, restaurants and banks. france has seen a slight resurgence of coronavirus infections. budget negotiations between leaders of the 27 eu member states have gone into a fourth night in brussels. their summit was initially scheduled to last two days. they are attempting to settle a trillion—euro budget covering the next seven years, alongside a 750 billio euro covid recovery fund.

president trump has threatened to send federal law enforcement personnel to more american cities. federal officers have already been deployed in portland as anti—racism protests continue. there have been 52 nights of demonstrations there against police violence, in the wake of george floyd's killing. portland's mayor has accused federal forces of abusive tactics. this from our correspondent sophie long. another night of conflict on the streets of portland. tear gas is fired at demonstrators to drive them away from the courthouse. there have been protests against police brutality and racism here every day for nearly two months, and they are becoming increasingly volatile. some say that is due to the presence and tactics of federal officers. it's picking back up, ‘cause we've got the feds out here. they're tear gassing people, they're snatching people up, they're beating people

in the streets. local leaders say this is an abuse of federal power. but president trump says they are helping portland, not hurting it. portland was totally out of control. the democrats, the liberal democrats running the place, had no idea what they were doing. they were ripping down, for 51 days, ripping down that city, destroying the city, looting it. the level of corruption and what was going on there is incredible. and then the governor comes out, "0h, we don't need any help. " how about chicago? i read the numbers were...many people killed over the weekend. we're looking at chicago, too. we're looking at new york. look at what's going on. all run by democrats, all run by very liberal democrats, all run really by radical left. oregon's attorney general has filed a lawsuit against the federal government, accusing it of illegally detaining protesters.

every american needs to be concerned about what's happening here in portland. you know, these federal agencies are operating with no transparency and against the will ofjust about every leader in our state, and i assume it will be the same in other states where they show up. but portland is currently the poster child for this administration. they are using us, sort of throwing mud on the wall to see if this is an issue that might stick for the president. there is little indication the federal tactics are working. more people are now demonstrating, including a group of mothers who say they will come out until no protester needs protecting. and i thought they were just — they were going to leave us alone, because we weren't throwing anything at them. but that's not what happened. so we were gassed. they shot... it's like a very loud sound, and they also shoot these things that burst on the ground. i'm not exactly — i'm not

familiar with military garb or language, but it was terrifying. we're not there to hurt them. we're there to protest human rights violations. like, as americans, aren't we allowed? isn't that a protected right? the acting secretary of homeland security says the crackdown will continue, and if they see the same threat in other cities, they will order the same response. sophie long, bbc news. and we'll have more on that story a little later. donald trump has now declared that "many people say" it is a patriotic duty to wear a mask if they can't socially distance. in recent months, the president has made wildly divergent statements on the importance of masks in containing covid—19. there's been much criticism from the democrats and some scientific advisers. he now says he "believes" in masks, but claims that they "also cause problems." amber heard has told the high court in london her former husband johnny depp threatened to kill her many times. she's begun giving three days of evidence as part

of the actor's libel action against the owners of the sun newspaper. johnny depp is suing over the allegation that he was a wife—beater, which he strongly denies. david sillito reports. amber heard, here in the white blouse, arriving in court for the beginning of her account of her relationship withjohnny depp, who was himself arriving in court through a different entrance. the case brought byjohnny depp is a libel action against the publishers of the sun newspaper over an article that described him as a wife—beater. did he give it to you? the couple first met on the set of the film the rum diary. during their relationship, she says, he repeatedly assaulted her — punching, slapping, kicking, head—butting, choking. she says she feared for her life. but in court, she was also asked about a recording

of an argument. was this evidence that she had hitjohnny depp? i did not punch you. i did not bleep deck you. i bleep was hitting you. i don't know what the full motion of my actual hand was but you're fine. i did not hurt you, i did not punch you, i was hitting you. how are your toes? what am i supposed to do, do this? how are your toes? i'm not sitting here bleep about it, am i? you are. that's the difference between me and you. you're a bleep baby. because you start physical fights? you are such a baby! grow the bleep up! because you start physical fights? i did start a physicalfight. yeah, you did, so i had to get the bleep out of there. yes. she said she was being sarcastic. if she had hit him, it was only to stop him choking after he had passed out. she was also questioned about this red mark. it was visible at a court appearance in 2016 but officers who saw her at the time of the alleged incident said they saw no mark. it was put to her in court. "i suggest you were not injured at all." "that's not true," she said. "johnny threw a phone right at my face. it was just one of many incidents." the questioning continued. "a number of officers saw you.

a number of people saw you with no injury. are you saying they are all lying?" she answered, "i don't want to call anyone a liar." in court she was questioned about an arrest for alleged domestic violence in a previous relationship. she said there was no assault, no charges were brought. she was also questioned about a medical report that talked of substance abuse and mental health problems. all untrue, she said. johnny depp strenuously denies all the allegations but amber heard says she thinks he doesn't remember what he did and has been convinced by others that she is making things up, to which she says, "i am not." david sillito, bbc news. stay with us if you cannot bbc news. much more to come. including this. polar bears under threat from climate change — why they could be extinct by the end of this century. nasa: can see you coming down the ladder now. one small step for man... one giant leap for mankind.

a catastrophic engine fire is being blamed tonight for the first crash in the 30—year history of concorde, the world's only supersonic airliner. it was one of the most vivid symbols of the violence and hatred that tore apart the state of yugoslavia. but now, a decade later, it's been painstakingly rebuilt and opens again today. there's been a 50% decrease in sperm quantity and an increase in malfunctioning sperm unable to swim properly. seven, six, five, four.... thousands of households across the country are suspiciously quiet this lunchtime as children bury their noses in the final instalment of harry potter.

welcome back. very glad to have you with us on bbc news. one main headline dominating the agenda at the moment. scientists at oxford university say the coronavirus vaccine they‘ re developing appears to be safe and triggers an immune response. let's bring you some breaking news now — and live pictures from brussels as european union leaders are set to resume their negotiations on europe's post—pandemic economic recovery package. several officials said a deal was ready and awaiting the leaders' approval. budget negotiations between leaders of the 27 eu member states went to a fourth night in brussels. their summit was initially scheduled to last two days. they are attempting to settle a trillion—euro the next seven years alongside a 750 billion euro covid recovery fund. we will bring you more on that when we have a result or

anything meaningful on that. deploying federal officers and cities without mayors or state governors is very unusual. as law professor geoffrey corn explains. i think the complaint is first that there doesn't appear to be any effective co—ordination between the federal, state and local authorities and secondly, there is a perception that the president is contributing to, that the mission of these federal law enforcement agents extends well beyond simply protecting federal facilities in these cities, when the president suggests they are going to essentially take over the responsibility for maintaining law and order in the cities which they do not have the authority to do. cuba is in the midst of a currency shortage, making it difficult for the communist government to find the cash its needs to import crucial international food and supplies. authorities have responded by allowing new ‘dollar stores' to open up.

as alanna petroff reports, cubans are being encouraged to start using their stashed—away american cash to buy much—needed groceries, and get more money flowing through the economy. cu ban customers start moving into the stores, ready with their us dollars to buy loads of groceries. bottled items, canned goods, bags of flour. if you have the money and you can find the items, you'd better buy them now. cuba has just begun allowing people to start using their us dollars to buy everyday items that are in short supply. translation: it's another opportunity, another way for us cubans to make purchases. it's another possibility and up to now i think it's working well. some cubans have family members that send them american money from abroad. this week they can use the money legitimately. it hasn't been this way since another difficult time in the 1990s.

translation: it is not a currency that we have easy access to, but i don't see it is wrong to use it. cuba's communist government controls these are stores and has tight control over the economy. as tourism has cratered in the midst of the pandemic, the country is running out of international cash and securing fresh imports to stock stores is tough without international currency. the cuban peso isn't accepted outside the country. locals say there is not as much variety as they wanted, but the stores that accept us dollars are less crowded. translation: there were fewer people in shops that take us dollars. it's more comfortable. from what i've heard there'll be less pressure on shops.

if you have money that is being sent from overseas and you go to the stores, you buy what you need without the big crowds. cuba and the us have been old foes for decades. the trump administration has been tightening a trade embargo on the country and making it more difficult for cuba's economy. the move to start using american currency in cuba isn't ideal, but these aren't ideal times. alanna petroff, bbc news. the egyptian parliament has voted to authorise deployment of its military abroad to defend what it says is its national security. it's an apparent reference to neighbouring libya, where egypt has been supporting the militia leader khalifa haftar against the libyan government. here's sally nabil. this does not necessarily mean that egypt will be sending troops to libya. the outcome of the vote today was highly expected that it will give the mandate to president sisi to send troops overseas to libya but according to a lot of experts we have been talking to, egypt is trying to use this as some sort of leverage, this potential scenario of getting involved in libya as some sort of pressure on warring parties and on allies to come back to the negotiating table

and try to find out a solution via diplomacy. according to experts as well, egypt does not want to get caught up in some sort of a guerrilla war in libya. cairo has always accused the national accord government and its ally turkey of bringing in a lot of mercenaries and militants and the egyptian army does not want to get involved in such a kind of war, according to people we have been talking to, so yes, the parliament has agreed to send in troops to libya, but this does not mean that we will see boots on the ground any time soon. this might be only some sort of pressure or kind of political tactics. a new report warns polar bears

could be almost extinct by the end of the century if we don't act fast. victoria gill has the story. they are the poster species for climate change. predators that depend on a fragile, transient hunting ground, the arctic sea ice. and this study has shown that polar bears' survival is tied to that ice. the scientists used models based on satellite data to forecast sea ice decline in the arctic over the coming decades. that enabled them to predict a future tipping point, to create a timeline for when the frozen hunting season will be too short for the bears to fatten up before the summer. at the current rate of warming, the researchers say all but a few polar bear populations will collapse before 2100. with less fat, they're entering a fasting season that's longer than it used to be. so, is that now unavoidable? are we already on that trajectory, to just lose polar bears? the trajectory that we're on now is not a good one. but if society gets its act together, globally, we can halt

global warming in time to save polar bears. and if we do, it will benefit the rest of life on earth, including ourselves. the consequences of climate change are already playing out in the arctic landscape. and this new timeline, the researchers say, is a stark reminder that the survival of an entire species is at stake. victoria gill, bbc news. still with the animal world, in mexico zoo has released footage of its newest and certainly cutest arrival. tamba, who's 22 years old, gave birth on july 13th and the pair have been inseparable since, enjoying long soaks in the water at zacango zoo. keepers are confident the calf is healthy but with the baby bonding so close to its mother, they have been unable

to determine its gender. that's it finau. thank you so much for watching. —— for now. hello. this week started off on a fairly dry settled note for most places, but we will see weather fronts approaching from the atlantic, bringing some outbreaks of rain in through this week. now, tuesday will start on quite a chilly note. we will see the cloud building through the day and that will bring some rain later on to parts of northern ireland and scotland courtesy of this weather front approaching here. further south, high pressure holding onto things so it's a dry picture of it to sit across the book of england and wales. under clear skies, quite a chilly start. temperatures in the mid—single figures for many of us first thing tuesday morning, a few early mist patches. in fact temperatures could be as low as around 3—4 degrees in the coldest rural spots. after that fresh start, there will be some long spells of sunshine through the morning.

later in the afternoon, cloud will tend to build so that sunshine at times a bit hazy, cloudier skies later on in the afternoon. some rain working into the northern parts of northern ireland, the western isles as well. 1—2 showers around for the north—east of scotland too. now, temperatures across scotland and northern ireland between about 14—18 degrees. england and wales typically around 18—21 celsius, a little below par for the time of year. heading into tuesday evening and overnight into wednesday, we will continue to see this weather front in the north bringing rain, quite heavy at times, to northern ireland and parts of scotland as well. for england and wales, it's going to be dry, but with the cloudier skies, it won't be quite as chilly as it has been over the past couple nights. into wednesday, outbreaks of rain continue at times for northern ireland and for scotland. later in the day, a few of those showers could just push into parts of northern england and north wales as well, but further south across england and wales, we should have a dry day and with some sunshine, it will be a little bit warmer. so temperatures up to about 23 degrees down towards the south—east. we're typically looking at the mid to high teens further north across the uk. looking towards the latter part of the week, and this waving weather front will push its way gradually southwards and eastwards, bumping into higher pressure across the near continent.

it will be fizzling out, but we could still see some outbreaks of rain thursday particularly across western parts of england and wales too. they'll be followed by some fresher, brighter conditions of sunshine and scattered showers across parts of scotland, and temperatures will range between about 16—22 degrees on thursday. then things continue on a fairly unsettled and a showery theme as we look through friday and into the weekend for many of us, as well. that's it for now. bye— bye.

this is bbc news. the headlines: let's bring you more on that breaking news now — as european union leaders are set to resume their negotiations on europe's post—pandemic economic recovery package. they are attempting to settle a trillion euro budget covering the next seven years alongside a 750 billion euro covid recovery fund. early results from two more coronavirus vaccine trials have produced an immune response without any serious side effects. one was carried out at oxford university, the other at china's academy of military medical sciences. further work's needed to assess how long lasting any immunity would be. president trump has threatened to send federal law enforcement personnel to more american cities to tackle anti—racism demonstrations, which he claims are the work of anarchists. democrats, civic leaders and civil liberties groups have called the officers' actions in portland deeply disturbing and unacceptable.