the northeast of england. the two boys entered the water yesterday afternoon. the younger child was rescued and taken to hospital. the cabinet minister — grant shapps — has said families affected by the infected blood scandal were let down for decades. he said the response by both the conservatives and previous governments had been too slow. the final report of a public inquiry into the scandal will be published tomorrow. you can get more on all of those stories on the bbc news website and app. i will have a full bulletin of news for you at 3pm. now on bbc news, click.

this week, preparing for a long flight. this plane can stay up in the air almost indefinitely. how? sunshine. why? wait and see. tracking the sunshine beside the tracks but paul has got distracted. understatement of the century. how to keep connected up a mountain when things go downhill. we to keep connected up a mountain when things go downhill.— things go downhill. we have a re orted things go downhill. we have a reported casualty. _ things go downhill. we have a reported casualty. and - things go downhill. we have a reported casualty. and the . things go downhill. we have a. reported casualty. and the text things go downhill. we have a - reported casualty. and the text that is keein: reported casualty. and the text that is keeping the _ reported casualty. and the text that is keeping the ref _ reported casualty. and the text that is keeping the ref in _ reported casualty. and the text that is keeping the ref in check. - reported casualty. and the text that is keeping the ref in check. with - is keeping the ref in check. with this technology _ is keeping the ref in check. with this technology i _ is keeping the ref in check. with this technology i can _ is keeping the ref in check. ti this technology i can say, right there, that's what i am talking about. let me take you up. up into the air. up above the clouds, above the weather, above all the aircraft.

this is the stratosphere — a place yet to be conquered by humankind. up here, the air is thin and calm. and it is here that you'll find the zephyr. this is a strange beast — and the fact that it flies this high is the least strange thing about it. see, it only travels at aomph, it only weighs 75kg. it's launched by hand, it's completely solar—powered — and in theory, it may be able to stay up here for months. i was last at zephyr�*s base in farnborough in the uk in 2018, when it had just stayed aloft for very nearly 26 days. since then, it's done 64.

so, this is how it works. during the day, the sun hits the solar panels, which charge the batteries and power the propellers, and the plane climbs to 75,000 feet. when the sun goes down, the batteries completely take over. the propellers do slow down and the plane does lose altitude. the trick, though, is to make sure you're still above 60,000 feet by the time the sun comes up the next morning — and the process can start again. so, will the entire wing be covered with solar cells, every single square centimetre, as much as you can in solar? actually, the solar array that we use now typically is so efficient that we don't tend to need to do complete coverage. really? yeah, we can actually recharge the batteries most normal days by lunchtime. wow! in theory, is it possible to stay up forever in this? well, i think eventually, we'll get as close as we can to that.

at the moment, our limitation is the number of cycles the batteries can cope with. so, a cycle is a day — so a full charge, and then a full discharge, that's one cycle. and we're targeting six months in the stratosphere at a time, and that's in line with the battery performance that we see coming through. so, look, i get it. everything about zephyr has been fine tuned, the precise curve of those wings. so, look, i get it. i get that this plane can stay up in the air almost indefinitely. you only have to look at it to understand that it's something pretty special. the main question i have is why? from the stratosphere, at 60—70,000 feet, we can talk why would you want this kind of

craft? who would want this kind of craft? who would want this kind of craft? in the 20 years since this idea was conceived that is almost been like a solution looking at a problem. could it carry cameras, be military reconnaissance? since airbus spun off a new start—up company it is being tipped for earth observation and as a flying base station for mobile phones. from the stratosphere at 70,000 feet, we can talk directly to a standard mobile phone. directly to a standard mobile phone, so the aircraft will function exactly like the cell tower that you have today, but it's high up. and, because it's so much higher up than the regular cell tower, it can cover the equivalent of about 200 base stations on the ground. so, of course, that replaces notjust the, you know, the equipment on the tower, but it replaces the whole tower. that is the steel, the fibre, the microwave _ that is the steel, the fibre, the microwave and very importantly the

electricity— microwave and very importantly the electricity or the diesel that runs the powen — electricity or the diesel that runs the power. in many cases in remote and rural_ the power. in many cases in remote and rural areas it is the most expensive _ and rural areas it is the most expensive part of running a terrestrial tower. an uplink antenna would connect the mobile network to zephyr, and then zephyr could serve an area of 7,500 square kilometres, in theory, for months at a time. this is a real proposition. or in the event of, say, a natural disaster, a plane could be flown to an area that had suddenly become cut—off from the grid. mobile operators have something called cell on wheels — cow — which is usually a truck that has some equipment. we have a cell on wings, a flying cow, which is flying cell on wings. these cows — er, planes — will fly autonomously. there are no joysticks involved. the pilots send the planes coordinates and flight plans — but they're mainly interested in how much energy it's using, and making adjustments to keep its batteries fully charged. so this is the ground,

and this is 80,000 feet. and all this colourful stuff, that's wind — you don't want to be in that — but if you can keep the zephyr above it, from about 60,000 feet and up, it's pretty plain sailing. the problem is, you've got to get to 60,000 feet in the first place — something that can take ten hours from that weird hand—launched ta ke—off. trying to get it into the air is probably the trickiest point. there is a lot more weather on the surface than in the stratosphere so trying to get the right conditions to get through that where there is the hardest part. we've spent a lot of time and effort studying meteorology in the tropopause, so that we can understand how to transit through it as safely as possible with this aircraft. and we've now done a global study of where all the weather is, and all the different weather conditions around the world, and we've found some of the best locations in the world to start launching and landing these from regularly.

so, where the air is nice and clear, all the way up. all the way through, yeah, and once we're in the stratosphere, we're away. in fact, zephyr�*s parent company has just announced kenya as the location of its first planned permanent launch site. but we have seen these kind of ventures before. for example, google's loon project was also based in kenya, and its balloon—based mobile cell tower project failed to stay afloat. and what about satellites? these days, very small cubesats can be put into orbit at much lower cost than their bigger siblings — and they stay up automatically, no power involved. although, unlike zephyr, you can't bring them down and swap out their payloads. with satellite, if you want to talk to a handset, it's very difficult. and if you manage with low earth orbit satellites, you can talk to a handset, but it would be very limited. you know, it's sms, maybe a few kilobits per second, you cannot do full 56. you're not mimicking what a terrestrial station does.

and if you have satellites that are really big enough that can do something like this, the economics are so expensive — and then, you're spreading them across the whole planet, you're not getting the efficiencies, you cannot scale. so that's on the connectivity side. 0n the earth observation side, satellites are great because they can view anywhere on the planet, but not persistently. because they take an image, come back after a period of time. with high—altitude platform stations, you can do that persistently, so you can see the change over time. and there is competition in the stratosphere itself. similar aircraft are being developed by several companies — including this one by bae systems. whatever the final use for these so—called high—altitude platform stations — haps — there does seem to be both the appetite and now the technology to fly high and stay high.

zephyr has the advantage of flying above the weather but for many activities the elements are really important. if you are going rock climbing conditions need to be good. sudden changes in the weather is something that can serious problems for climbers and when things go wrong on the hillside rescue teams are called and they often need expensive helicopter operations and combined emergency services. {line combined emergency services. one com an combined emergency services. one company is — combined emergency services. one company is using — combined emergency services. que: company is using 56 combined emergency services. iez company is using 56 and combined emergency services. i2 company is using 56 and drones to take search and rescue to another level. ., .,, take search and rescue to another level. ., , .,, take search and rescue to another level. ., , , take search and rescue to another level. ., , level. for most people paper maps are a thing — level. for most people paper maps are a thing of— level. for most people paper maps are a thing of the _ level. for most people paper maps are a thing of the past _ level. for most people paper maps are a thing of the past and - level. for most people paper maps are a thing of the past and instead | are a thing of the past and instead our mobile phones have become pocket navigators where data and google maps gets us from a to b but hiking is so much more than putting one footin is so much more than putting one foot in front of the other and travelling across remote roots can make the job of mountain rescue team extremely difficult. a sunny day in

the scotland's hills can be a glorious thing. a chance to get away from everything. but when things go wrong, a lack of connectivity can become a real problem. we have located casualty, _ become a real problem. we have located casualty, stand _ become a real problem. we have located casualty, stand for- become a real problem. we have located casualty, stand for grid. | located casualty, stand for grid. arming aircraft.— located casualty, stand for grid. arming aircraft. instead of sending a team into — arming aircraft. instead of sending a team into potentially _ arming aircraft. instead of sending a team into potentially dangerousl a team into potentially dangerous situations, these drones can be deployed across remote areas. using a p°p�*up deployed across remote areas. using a pop—up sg deployed across remote areas. using a pop—up 56 network the drone can send back crucial information to base. we are here on a very blustery angus hill in an area that doesn't have great connectivity but you have a 56 network operating. 2m have great connectivity but you have a 56 network operating.— a 56 network operating. an entire mobile phone _ a 56 network operating. an entire mobile phone network— a 56 network operating. an entire mobile phone network in - a 56 network operating. an entire mobile phone network in a - a 56 network operating. an entire mobile phone network in a box. mobile phone network in a box connected up to that antenna and it

is broadcasting sg connected up to that antenna and it is broadcasting 56 across the field. it goes back to a base station and we have the data on the laptop and we have the data on the laptop and we have the data on the laptop and we have a control station. each of these boxes has the ability to talk to other mobile phone base station so we can move around and create a p°p�*up so we can move around and create a pop—up network in no time. what so we can move around and create a pop-up network in no time. what are the challenges _ pop-up network in no time. what are the challenges around _ pop-up network in no time. what are the challenges around connectivity i the challenges around connectivity when you're sending up teams and drones? taste when you're sending up teams and drones? ~ ., when you're sending up teams and drones? ~ . , ., ., drones? we are using thermal imaging cameras on small— drones? we are using thermal imaging cameras on small drones _ drones? we are using thermal imaging cameras on small drones and - drones? we are using thermal imaging cameras on small drones and we - drones? we are using thermal imaging cameras on small drones and we can . cameras on small drones and we can find the data but we don't have it back at the control room. the one call is all the network can cope with at that point. it has enabled devices like phones and first responders to have access straightaway to connectivity. you have our straightaway to connectivity. you have your phone _ straightaway to connectivity. you have your phone on the network and i can confirm mine has absolutely no network. the 56 boxes can be mounted on the drones which can act like a flying sg on the drones which can act like a flying 56 network, and even drop off a 56 box to an injured mountaineer or send the location back to base.

within mountain rescue drones are being used much more than they were before. times past we would have to send a team into the gully to search it which in the wrong conditions could be quite dangerous. in a large area of search, we can search a large area relatively quickly. that would benefit our search managers and give them more information as the search flow is progressing. mountain rescue emergencies are not the only scenario for this type of technology can pop up. iiiiui’ith the only scenario for this type of technology can pop up. with disaster relief and humanitarian _ technology can pop up. with disaster relief and humanitarian efforts - relief and humanitarian efforts there are a lot of challenges around connectivity and those situations and local network struggle with mass movement of people. 0ther and local network struggle with mass movement of people. other things we are seeing, sometimes when there is are seeing, sometimes when there is a hurricane are a disaster fixed fibre can be down with wire connectivity in those places. iiiiui’ith connectivity in those places. with 56 opening _ connectivity in those places. with 56 opening pp — connectivity in those places. with 56 opening up new _ connectivity in those places. with 56 opening up new opportunities to achieve better connectivity, bad

signal has the potential to be a thing of the past. time for a look at this week's tech news. at a live launch demonstration open ai has revealed the latest version of the tech which underpins its chat but chatgpt along with key changes to its user interface. the new version can read and discuss images, and identify emotions with visual expressions. it is faster than earlier models and has been programmed to sound more chatty. tourist body visit wales has created an immersive visual experience with the aim of showcasing some of wales's best attractions. visitors can take part in quests and build a virtual interactive itinerary for when they visit wales in person. 0rganisers believe wales is the first european nation to use this

approach to marketing itself as a tourist destination. a robot designed to mimic the motion of a snail has been developed by researchers at the university of bristol. the team fitted the robot with a sliding suction mechanism enabling the device to slide on water, a substitute for a snail�*s mucus which also acts as an adhesive. it opens the potential for robots to climb difficult to access surfaces such as the blades of wind turbines or the hull of a ship. this is touch. it is a bit like rugby but instead of a tackled player is attached to get control of the ball. if the defenders haven't intercepted the ball after six touches they get to be the attackers. it is fast and the referee has to be everywhere at once and deal with things like this.

how far along you want him to go? he has had to make a decision against him which has resulted in a penalty and then the player continues that conversation with the referee resulting in another penalty. the referee would look back on this and not be particularly happy with the interaction with the player. referees on professional development courses here at edinburgh napier university can look back at their decisions thanks to some familiar —looking tech that has been repurposed. it -looking tech that has been repurposed-_ -looking tech that has been re--urosed. , ., , ., ., ,': ~:: repurposed. it is a standard 360 camera, repurposed. it is a standard 360 camera. it _ repurposed. it is a standard 360 camera, it sits _ repurposed. it is a standard 360 camera, it sits on _ repurposed. it is a standard 360 camera, it sits on top _ repurposed. it is a standard 360 camera, it sits on top of- repurposed. it is a standard 360 camera, it sits on top of the - repurposed. it is a standard 360. camera, it sits on top of the head with straps around the head. aha, camera, it sits on top of the head with straps around the head. a 360 camera works _ with straps around the head. a 360 camera works by — with straps around the head. a 360 camera works by using _ with straps around the head. a 360 camera works by using two - with straps around the head. a 360 camera works by using two or - with straps around the head. a 360 camera works by using two or more lenses to capture a 360 degrees view of everything around it. it will then stitch the shots together to make one spherical image. when displayed in 2d the viewer can move around all of the space that has been captured.—

around all of the space that has been captured. once you have the footaae been captured. once you have the footage back _ been captured. once you have the footage back what _ been captured. once you have the footage back what it _ been captured. once you have the footage back what it then - been captured. once you have the footage back what it then gives i been captured. once you have the footage back what it then gives usj footage back what it then gives us is how our decisions are landing, how interactions are landing with the players. we can see what is going on behind is and perhaps we have missed decisions. and going on behind is and perhaps we have missed decisions.— going on behind is and perhaps we have missed decisions. and you can see riaht have missed decisions. and you can see right round _ have missed decisions. and you can see right round so _ have missed decisions. and you can see right round so you're _ have missed decisions. and you can see right round so you're getting i have missed decisions. and you can see right round so you're getting a l see right round so you're getting a more immersive experience and you may be learning things about the game you may not have seen in real time. ~ .,, game you may not have seen in real time. ~ ., ., game you may not have seen in real time. ., ., ,, , time. most of our assessments in order to develop _ time. most of our assessments in order to develop as _ time. most of our assessments in order to develop as a _ time. most of our assessments in order to develop as a referee i time. most of our assessments in order to develop as a referee are| order to develop as a referee are taken by people on the sidelines but the referee sees it very differently and we know from research that looking at things from different angles produces different decisions. when the referees sit down with their coaches after a training session with the tech takes the post match analysis to a whole new level. as a coach i can't hear what the ref is saying and i don't have their point of view but with this technology i can see what the referee is saying and how they are speaking to the players but i can also use this technology to pan

around and look at what the referee is not seeing and what they are missing so we can talk about areas of improvement.— missing so we can talk about areas of improvement. when you sit down and review with _ of improvement. when you sit down and review with your _ of improvement. when you sit down and review with your coach - of improvement. when you sit down and review with your coach you i of improvement. when you sit down and review with your coach you can l and review with your coach you can look at the positioning and where you should have been verses where you should have been verses where you wear. you should have been verses where ou wear. ., you should have been verses where ou wear. . , . ., ., , you wear. having this technology means i you wear. having this technology means i can _ you wear. having this technology means i can say, _ you wear. having this technology means i can say, right _ you wear. having this technology means i can say, right there, i you wear. having this technology | means i can say, right there, that is what i'm talking about, and that is what i'm talking about, and that is what i'm talking about, and that is what we need to structure differently. is what we need to structure differently-— is what we need to structure differently. is what we need to structure differentl. . ., ., , , , differently. the technology is being used to coach _ differently. the technology is being used to coach referees _ differently. the technology is being used to coach referees in _ differently. the technology is being used to coach referees in the i differently. the technology is being | used to coach referees in the run-up used to coach referees in the run—up to the world touch championships in july. duncan hopes it could have a lasting impact. taste july. duncan hopes it could have a lasting impact-— july. duncan hopes it could have a lasting impact. we have always used video technology _ lasting impact. we have always used video technology and _ lasting impact. we have always used video technology and self— lasting impact. we have always used video technology and self reflection l video technology and self reflection to help officials about this technology allows us to take that another level up. i technology allows us to take that another level up.— another level up. i think with any refereeing _ another level up. i think with any refereeing at _ another level up. i think with any refereeing at his _ another level up. i think with any refereeing at his proximity i another level up. i think with any refereeing at his proximity to i another level up. i think with any refereeing at his proximity to the try or— refereeing at his proximity to the try or the — refereeing at his proximity to the try or the file 0r whatever is happening. the closer you are the better— happening. the closer you are the better so — happening. the closer you are the better so getting the positioning and moving yourself into position to make _ and moving yourself into position to make those decisions is really important sol make those decisions is really important so i think it will help to

do that— important so i think it will help to do that for— important so i think it will help to do that for me. birdsong. paul: this is the buckthorne cutting nature reserve, home to dozens of species of plants, insects, and animals. it's hard to believe it's just a few kilometres from the very centre of london, and a technology hot spot. it's a haven of calm and serenity — until this happens. love a train. the area here is based on previously unmanaged network rail land, the body responsible for most of the sprawling railway network in great britain — over 52,000 hectares. they're using a mixture

of traditional technology alongside machine learning to identify and monitor wildlife using the space here. we've got a massive estate across the whole of britain. the obvious question has to be, you think of network rail and you think of what we stood beside. why is network rail interested in investing here? we've got a massive estate across the whole of britain. it's 52,000 hectares which, if you squash it all together, is the isle of wight—and—a—half. and that estate, that network goes through every sort of habitat that you can possibly have. and so, we've got that biodiversity on our estate, and we can manage it and work with it whilst we're running trains. so i guess, with the kind of information that you're collecting, the research that you're doing, how is that beneficial to network rail as a company? what kind of things can you do with that information that you find out? it helps us monitor the condition of the habitats that we've got, so we can use that when we're trying to achieve our biodiversity targets. but it also lets us see what species are using those habitats. and if we know what's there before

we come in and do any work, then we can start mitigating for that. we can start doing the work at the right time of year or at the right time of day, so that we're less of a disturbance on those species. the monitoring is being carried out by zoological society of london — or zsl. they're using motion—sensing camera traps to help identify some of the animals. this is a camera trap, and we use this for monitoring wildlife. typically things that move, that are kind of larger—bodied, and that move along the ground. so we'll typically put it kind of on a tree, around this height — and there's a camera here and there's a sensor. so, if a warm—bodied animal moves past, it will trigger a number of photos. oh, look, that's us — hello! in the uk, we're using it largely for ground—dwelling mammals — so like, foxes and badgers and squirrels. they are really commonly captured especially — they are really commonly captured especially in these areas. also hedgehogs which has primarily the

focus, _ hedgehogs which has primarily the focus, but — hedgehogs which has primarily the focus, but also birds that will stop in front— focus, but also birds that will stop in front of— focus, but also birds that will stop in front of them if they are on the ground _ in front of them if they are on the ground. and if we used them in more special— ground. and if we used them in more special circumstances we can get smaller— special circumstances we can get smaller things like small rodents and it— smaller things like small rodents and it all— smaller things like small rodents and it all depends on where you place _ and it all depends on where you place them, because you can also put it up in— place them, because you can also put it up in the _ place them, because you can also put it up in the branches. you place them, because you can also put it up in the branches.— it up in the branches. you won't get many foxes — it up in the branches. you won't get many foxes up _ it up in the branches. you won't get many foxes up in — it up in the branches. you won't get many foxes up in the _ it up in the branches. you won't get many foxes up in the tree. - as well as camera traps, the monitoring team also use specially—designed acoustic monitors to capture audio from birds, bats, and rodents. and we can listen to all sorts of things— and we can listen to all sorts of things so— and we can listen to all sorts of things so bats vocalise an so ultrasound we can't hear it but we can record — ultrasound we can't hear it but we can record it— ultrasound we can't hear it but we can record it on this and visualise the sound — can record it on this and visualise the sound afterwards. it's a very cool _ the sound afterwards. it's a very cool the — the sound afterwards. it's a very cool. the same with dormice, they also vocalise on ultrasound. they sound _ also vocalise on ultrasound. they sound kind — also vocalise on ultrasound. they sound kind of like a whining teapot, it is crazy _ sound kind of like a whining teapot, it is crazy in — sound kind of like a whining teapot, it is cra . , it is crazy. in this little thing icks it it is crazy. in this little thing picks it up? _ it is crazy. in this little thing picks it up? this _ it is crazy. in this little thing picks it up? this picks i it is crazy. in this little thing picks it up? this picks it i it is crazy. in this little thing picks it up? this picks it upl it is crazy. in this little thing i picks it up? this picks it up and we use it for birds _ picks it up? this picks it up and we use it for birds as _ picks it up? this picks it up and we use it for birds as well, _ picks it up? this picks it up and we use it for birds as well, we - picks it up? this picks it up and we use it for birds as well, we can i use it for birds as well, we can hear— use it for birds as well, we can hear them _

use it for birds as well, we can hear them right now. while the method of collecting the data may be relatively low—tech, what happens with it afterwards is very much cutting edge. zsl�*s initial pilot project captured 35,000 data files — or 3,000 hours of audio — from just 33 acoustic monitors placed across network rail's estate in south london alone. they needed a way to efficiently analyse such large volumes of data — which is where our old friend ai comes in. zsl worked with google, using cloud storage and pre—trained machine—learning models, to identify and map species to the network rail estate. back at zsl hq, i sat down with lydia to see some of the results of the analysis. in some cases, there are some really good machine—learning models already trained — so for instance, for birds and bats, there are some excellent models out there. and essentially, they use these spectrogram images that i'm showing you here — these are really distinctive images — they basically learn these images which are associated with these different species.

the ultimate aim for this research is to understand the true scale of the biodiversity around network rail's 20,000km of railway corridor. and advances in technology like this make that more achievable. the scale of the entire estate, it is really enormous, there is no way you could get to the whole thing. so i think it is using a variety of different tools in combination. satellite remote sensing is the most obvious fully scalable approach for the railway line in the use that for habitats and this is how we can add an additional layer of information. that was paul and that is all we have time for. thanks for watching and we will see you soon.

good afternoon. it is an afternoon of contrasts. quite chilly with the c4, of contrasts. quite chilly with the ca, very warm and land. 25 in places. 0ver ca, very warm and land. 25 in places. over the coming week we are in for some changes, turning cooler after the dry and warm start because of the wet and windy weather moving on. quite widespread rain looking like at this stage. we have had some sea fog around the irish sea coast but inland there is less clout than we had yesterday across england and wales and fewer showers but there are still some storms around. very isolated in comparison but slow moving and giving a lot of rain. 0ne moving and giving a lot of rain. one or two further north across northern england, notably cumbria, and also northern ireland and southern

scotland but more cloud across southern and central scotland thick enough to produce the odd spot of rain. as showers fade must stand low cloud will roll in widely to central and eastern areas, further west a few fog patches as well and it will be a slightly fresher night for sleeping compared with last night and they cooler start to our monday morning but a murky and the grey one once again and a few hours before the strong sunshine gets to work and burns it away. it should retreat for most of the east coast, subtle change and wind direction and warm in the sunshine with northern ireland seeing some of the highest temperatures, 22, 23, and that could trigger the odd slow—moving thunderstorm. 0vernight monday to tuesday, mist and fog returns but if you more showers approach from the east and one or two on this weather front start to break out further west. still chilly, notably so in northern and eastern areas and then we see shower development across

northern england, perhaps into central and southern parts and this is the weather front that will bring thundery rain to the west as well. sandwiched in between, still some warmth and sunshine, the temperature above the average but then it starts to drop away. by tuesday night and wednesday we are getting this area of low pressure. the devil will be on details as to where it will land but it seems it will give many parts of the uk some wet and windier weather and the temperature falls away and staying a showery picture the weekend.

live from london, this is bbc news. breaking news. state television in iran says there's been an accident involving a helicopter that might have been carrying president ebrahim raisi. president biden's national security adviser meets israel's prime minister in the latest attempt to halt the fighting in gaza. a 14—year—old boy dies after getting into difficulty in the river tyne in the north—east of england.

a 13—year—old remains in a critical condition. the uk's biggest ever health scandal — billions of pounds of compensation expected for the thousands of people infected with contaminated blood. who'll come out on top — arsenal or manchester city — on the final day of the premier league season? and — auf wiedersehenjurgen — — there'll be an emotional farewell at anfield forjurgen klopp. hello. we start this hour with some breaking news out of iran. state television says there's been an accident involving a helicopter that might have been carrying president raisi. with me is sebastian usher, our bbc world service middle east analyst. this means only just this means onlyjust coming into us. what do we know?—

what do we know? welcome away caettin what do we know? welcome away getting information _ what do we know? welcome away getting information from - what do we know? welcome away getting information from various l