in connection with monday's suicide bomb attack at a concert in the city of manchester. nine people are currently being detained, and the chief counter—terrorism officer said most of the network believed to be linked to the bombing had now been detained. egypt's air force has been in action in libya, targeting jihadists in the east of the country. egypt's president, abdel fattah el—sisi, said the strikes were in retaliation for a militant attack on a bus carrying coptic christians. at least 28 people were killed in the ambush, south of cairo. the united nations secretary general says the paris climate change agreement will not collapse if president trump does as he has threatened and withdraws the united states. antonio guterres, speaking at the g7 summit in italy, called on donald trump to stay engaged with the agreement. now on bbc news, click. this week, wall climbing graffiti

bots. all aboard the holodeck. and just watch out for the rodents. 0h, there is a mouth! —— mouse! data is all around us. we generate around 2.5 billion gb of it every day. think of it as, well, there is no other word for it, really. enormous. and we are finding lots of new ways of gathering even more of it. machines are now able to look at videos and interpret what is in the

image, and with the number of cctv cameras around the town, imagine how much more data we can collect. but the real intelligence is not in capturing the data. it is in analysing it. and this is where artificial intelligence might make a real difference, making connections that we humans never would. big data has accelerated our understanding of medical science in unimaginable ways. it is now influencing how hospitals treat patients, police forces manage crime, and city officials run our towns. and it is inevitable, in the next 50 years, that al inevitable, in the next 50 years, that ai will play an even bigger role in our society, and influence how we go about living. i recently met dj patil, president barack obama's chief data scientist, who was in charge of shaping how big data is used by the government to make big policy decisions, while ensuring the aia created by the tech

companies treat everyone fairly and make good decisions. that is where we have to start focusing more about energy, is asking the question of how do we actually make sure that these algorithms are going to work these algorithms are going to work the way we want? people talk about self driving cars. it is a self driving car going to see someone with my skin tone, or someone with a darker skin tone? a person with a wheelchair? is that a person in the dataset? how do start saying... you are suggesting whether a self driving car would recognise you as something it should avoid. yes, boyd, because we have different skin colour. are people with your skin colour. are people with your skin colour the only ones in the data set, ami colour the only ones in the data set, am i ignored? is thatan accident? but what about somebody with a handicap? what about a kid on a tricycle? it is not sufficient to say oops about the algorithm. we have to figure out a more robust process as these things are becoming more integrated into our society. and if we have learned anything from

this week's facebook story, it is that tech companies are not the most transparent lunch. facebook has been around for more than a decade, and only now, by chance, have we got a glimpse of how its moderators decide what we see on its platform. so how do we make sure the ai built by the same tech companies are using our data responsibly? so the first, it comes down to how are you trained? in ourtraining comes down to how are you trained? in our training these days, we often have found that technologists are no longer trained in humanities. one of the most critical components of humanities is the notion of ethics, so humanities is the notion of ethics, so what we have called for is that every data scientist, every economist, anybody who works with data, must have ethics integrated throughout their entire curriculum. so you can start to have the conversation and dialogue about what are the ethical implications of the choices you make second part of this is how about security of the data? how do you make sure that you are actually building the algorithms with security, the datasets with the

purity so people can'tjust break in. that has to no longer be elected oi’ in. that has to no longer be elected or something outside. that has to be pa rt or something outside. that has to be part of the core training. once you have this component of our training, i think you are going to have a new set of people who have the vocabulary to talk about it. but that doesn't take into account the speed at which it is happening on taking place today. so what we do then? number one, transparency. president obama signed an executive order that said by default all data the federal government on the us federal government, publishers, must be open and machine—readable. and what that allows people to do is be able to access the data, preparing, use it, and innovate with it —— compare it. and that is the problem, how do we strike the balance? we need to know that a a! system is not biased as loan from a dataset which includes all of us, and its decisions are fair, but we also don't want to stifle its process will make progress, because when it is used in the right way it really can change things for the better. what we have found in one of the problems around a localjail system

is that there is a huge number of people who are just cycling in and out of the system. i mean, the numbers are extraordinary. more than 11 million people through 3100 jails, they stay there on average 23 days. 95% never go to long—term prison. it turns out there are a lot of mental health issues, a lot of drug addiction. so what happens to those people? where is the data going? it stays in silos. the healthcare going? it stays in silos. the healthca re system going? it stays in silos. the healthcare system has a silo, criminal justice. healthcare system has a silo, criminaljustice. so what happens if you just talk and share that information? is said do you see sally and data set and say we saw sally and data set and say we saw sally all the time? well, why are we sending her to jail, let's send her to the right intervention. so doing that, how much can you save? what is the real impact? it costs 1.5 million to train of ron on the right intervention and share the data, and everything. the first year alone they saved more than $10 million,

but more importantly they were able to close a fulljail. and later on they close second jail because they are giving people the right care. welcome to the week in tech. it was the week that volvo announced it's working on an ai rubbish truck that will follow collectors from house to house. ikea said they will release smart light bulbs that can be controlled by voice and sync up with home devices like alexa and google assistant. and google fancied another "go" at go success. the a! system alphago took on the world's number one go player kejie, and won the series. alphago learned to play by studying old matches and playing thousands of games against itself. the hope now is it will be used in medicine and science in the future. more bad news for uber this week, as it admitted it underpaid drivers in new york for more than two and a half years. tens of thousands of drivers will now be paid about $900 each, which will mean uber paying out tens of millions of dollars. and only one month into the release of samsung's new galaxy s8

smartphone virus scanner, and it's already been hacked. german hackers fooled the scanner with only a paper printer and a contact lens to make the fake eye. and is robocop from the ‘80s becoming a reality? well, not quite, but dubai police want these robots to make up 25% of its force by 2030. they launched the unit on wednesday, which can forward video feeds to the police, settle fines, has facial recognition, and can speak nine languages. i'd buy that for a dollar! graffiti art has been one of the hottest art movements over the last few decades. like many graffiti artists, graeme — or xenz, the name he goes by — cut his teeth on the streets. in this case, the streets of bristol. and he has since grown into the artist that we see on the roof of his east london studio.

today, he's taking a break to do this for us. but he's more known these days for these amazing natural scenes which are exhibited and sold all over the world, and which incorporate all of the graffiti techniques that he's honed over the years. yeah, over time you really understand what the can is about to do. you know, you come to rely on these tools, like the nozzle or the weight of the can. like the way that i use the edge there to keep one edge sharp and one edge faded, then this, you know, different lines, adding colours. so there's a lot of disciplines that go through painting that are the same here, you know. years of practice... no, we don't have that kind of patience. so could we pull off something similar to this by combining technology with someone who has no creative talent whatsoever? to find out, we sent nick kwek to estonia... tartu, estonia's second—largest city. like most cities, graffiti and street art provoke around every corner. if you know where to look.

it's also home to one of the biggest spray—painted pieces i've ever laid eyes on. but albert's been painted dot by dot, and i've been promised i too can achieve artistic genius with the right tools. believe it or not, these pictures have all been painted with spray paint. they've been pieced together splodge by splodge by the sprayprinter device. my daughter wanted a unicorn on her wall, but i couldn't draw. so that pushed me towards creating this device. to make these magical masterpieces you need the right kit — a smartphone with the appropriate app installed, an external battery pack to keep it fullyjuiced, a tripod to hold it steady,

some paint, and of course the sprayprinter. first you select an image and align it against the area you want to paint. so the image is projected like a giant virtual sticker. portraits with shadows work best. the phone's camera exposes for the led on the device, and when it illuminates it sends the can's location to the app. the phone then tells the printer its coordinates and the printer decides when to spray and when not to. once you get the knack of it, it's actually surprisingly simple to use. you just have to make sure you go from left to right, or right to left, very smoothly, in a straight line. for all its geeky brilliance, it's a real labour of love. even the most simple of designs takes several hours. depending on how complex the picture, and the size, the amount of layers, the different colours

you want to paint with, you know, that determines how long doing one of these is going to take. you need to move your hand relatively steady, so if you start moving your hand very quickly you're losing accuracy. not sure i could really stand your for several hours doing this. with the next model, you should be able to move your hand relatively freely as you would with a regular paintbrush. to give your arm rest, the team have already started developing robotic versions to do the spraying for them, meaning larger more complex images. i developed this extra accessory for the sprayprinter to atomise the process, because for high scale images the hand—held method takes too much time and effort. soon, others will be able to join in

too, hopefully speeding things up a bit. but does the printer help artistic expression, or simply kill it? a person who can't draw at all, this gives like guidelines of how to paint. it's like sort of a colouring book, but you can go over the lines, but the paint will still only land in the right places. i think for people like myself, we call them artistically challenged... laughter and i think this device gives them new power. the finished result? it started off only a few small dots. you actually have to stand back a few feet to get the full view, to get the right perspective on it. how good is that? so what would you like to see spray—painted next?

well, the guys have been holding a competition and this winning submission, just announced, will soon be painted on a local giant abandoned power station chimney for all to see, but painting on this curved structure has posed new problems, which mihkel is determined to solve. i thought it would be a good idea to use a vacuum rover, so this is just a four wheeled platform that drives across the wall. it attaches to the wall using vacuum. yeah, and in true blue peter fashion, here's one i made earlier. yeah, all me. entirely done by me. all of it. well, that was nick kwek with the sprayprinter. graeme, worried? not really, no. i mean it's a great tool. it works like a projector. it helps us to get these large images

up easier but no, i think i'm quite comfortable in what i'm doing right now. i might use it one day though. it definitely has its advantages, for sure, yeah. well, in the meantime, this is beautiful. thanks so much for doing this for us. thank you. we're going to stay on and art tip now. over to lara lewington. here at photo london art takes many forms. but the thing i've seen that i've grappled with the most is the idea of a virtual reality gallery. is this really a way to fully experience art? this lot certainly seem to be engrossed in the experience. so what's going on in here, and in here? well, in the 1800s when people saw photography for the first time they were absolutely wowed by it, but of course now we are a little harder to impress. so what's happening is some of those initial images are being brought back to life

in virtual reality. here in this room, the birmingham gallery where fox talbot‘s original original photographic images were shown has been recreated in vr. well, initially i wasn't sure that looking at these images in virtual reality seemed like something that actually makes sense, but apparently you can pick up the images by holding your hand over it like that, and then you can hold the image in your hand... ok, that's pretty amazing. you can really see the texture of it as well. this genuinely feels like i'm standing in front of a fire. in fact, it actually feels quite hazardous because you can see smoke coming off it and that is proper serious heat. oh, there's a mouse! oh, no! the mouse actually looked so real! but whilst the juxtaposition between the origins of photography and a new visual medium are deliberate, making sure it provides a meaningful experience

for those with a yearning for art has proved a challenge. nothing fills me with a greater melancholy than going into an exhibition and seeing somebody with a virtual reality headset on, and having to queue and wait for your turn on it — it's just not very stimulating. so what i've tried to do in this installation is to make that part of the actual experience, so when you're not in the room you can look at people with their headsets and backpacks on. watching the goings—on of people wandering around is quite strange and surreal to look at, so hopefully it's still interesting as an artwork even when you're not in the headset. so i can hear some sound coming from over here. that's because of the binaural sound that's built in, and there seems to be something happening outside... i believe this is the chartists‘ revolt. this is a lot of people objecting to photography. this wasn't the only vr at the show, though. one family of art collectors

wanted to virtually take their wares out of storage. you can have your art museum in your pocket. i can have 200 metre museum just in my laptop. that could be sharing a collection internationally, a trip to a virtual art gallery for those who are housebound, or introducing a new audience to art who might be more tempted by the vr element. the real—life version of this statue is 15 metres tall. i will head towards it and have a closer look. i can actually see the size of it by those people walking around. and in fact the size of that piece of art behind it, the scale of all of this, is absolutely massive. it would require such a large building to actually house all of this stuff. amidst the physical art were the latest techniques in holographic imaging, entire film is superimposed on single images, and this paris park scene. so behind this photograph we are looking at here is actually a massive plate of led lights,

all spread out with an inch between them, so each time you can see a person crossing the screen it's actually a combination of these lights being dimmed in that pattern, and what the human eye fills an in between to make it a complete opaque figure. amazing. one thing that seemed clear by the end of the day, though, was that vr can feel a natural part of an art show, and that i'm never going to be an art expert. elastic bands, and bulbs? that was lara. one of the brilliant things about working on click is that we all get to achieve our lifetime ambitions at one point or another, which is why this week mark cieslak became the captain of a starship! he took some of the rest of the click family with him, to boldly go where no

mark has gone before. space, the final frontier. these are the virtual voyages of the bbc click team. our mission: to wear vr headsets and discover strange, new technology, and boldly go where no tv reporter has gone before. virtual reality game star trek bridge crew brings together up to four players, each taking a different role on the bridge of a starship. the beauty of going where no one has gone before is that starship travel involves an awful lot of sitting down. sitting down is great for virtual reality because the headsets

have got these cables. if you're moving around it easy to get caught up with them. sitting avoids all the flat. and where better to be sitting in the captain's chair of a federation starship? headsets on, it's time for the click team to become a starship crew. wow. it's really strange. that's brilliant. incredible. oh, my goodness, mark! hi. i'm dabbing. all right, people? let's trek some stars. the early missions are all about orientating us with the bridge and how we interact with it. as helmsman, you are the ship's navigator. the headset shows us what the bridge looks like, but the playstation motion controllers allow us to interact with the various controls we have to master in order to fly the ship. help. yes? walk course to gamma hydra.

engage. oh, we're warping, everybody. 0h! wow. that's pretty, isn't it? that's good. wow. we don't have time for sight seeing, though, as we receive a distress signal from a stricken vessel. my vessel has lost all power and our life—support systems are nearly exhausted. here we go. scanning now. get on that scan. ok, so, engineering? yes. can you transport the survivors to here? i don't know. chuckles that wasn't in the training. laughter we're homing in at an alarming rate, captain. there are no options within transporter. it says right there in the list. transport, energised. it's at this moment that the action takes a turn which will appeal to star trek superfans.

ok, guys, this is the kobayashi maru scenario. this is an impossible to win situation. 0h! it's a d51 cruiser. it's a klingon d5 cruiser? yes. 0k. target it. bring us about so we can actually see that vessel. bring it in behind it. come on! turn it, turn it, turn it. find us. operating. there it is. ok, bring in those torpedoes. line up the phasers, and torpedoes away. get us back behind it. target destroyed. 0h! yeah, everybody, we just violated a peace treaty. wow. oh, wow. it's pretty warm work

being in virtual reality. it feels like it's social vr at its best, really. communication's a must. if you don't have it you're not going to complete the mission. great for team building. i thought we actually had our lives on the line for a minute. that ably demonstrates the power of teamwork. it's really, really important that everybody plays their role on the bridge, because if you don't then chaos ensues. we had a couple of sticky moments there, but i think we managed to pull it back and keep it together as a crew. and the result was a successful mission. brilliant. that was mark and the crew. that's it for this week. follow us on twitter at bbc click. or like us on facebook, too, where you can see lots of extra content and videos. now, while you're watching this we are doing a live show at the hay literary festival in wales. and next week on the programme you can see a little bit of what we're getting up to. can't wait. and if you're coming,

i hope you enjoy the festival. and we will see you next week. hello. with a bank holiday weekend now upon us, we are set to see a change in the hot, dry weather, that has been with us for the past few days. here was the scene on friday in moray. one of our weather watchers captured this. we will have similar conditions to start the bank holiday weekend. a humid start. more sunshine, but we are expecting to see some thunderstorms disrupting the sunshine. during saturday morning, we have this frontal system, this area low pressure, moving from the south and west, bring showers and thunderstorms across many parts of the country. for northern ireland, northern england, right down to the south—east, through saturday morning, we will see the showers.

during the afternoon, there will spread further north across the country. they are bumping into the warm air in place. 30 degrees or so across northern and north—eastern scotland. lots of fuel for these big showers and the thunderstorms. could be showers mixed in. this is 4pm on saturday afternoon. thundery showers likely across central scotland, northern ireland, into northern england. to the south of that, a little fresher than it has been — we may still see temperatures in one or two spots up to around 20 degrees. so lots of sunny weather on the clouds, still, do because on saturday. but the showers across northern parts of the country as we move through saturday evening and overnight. the odd rumble of thunder, here. but on into sunday morning, clearer skies across southern parts of the country. and it will feel a little more comfortable for sleeping through the early hours of sunday morning. temperatures will be down to 13 or 1a degrees. with a risk of some heavy downpours at times on saturday and late on sunday, there could be flooding on the road.

perhaps spray around, poor visibility, if you have got plans to be heading off for half term holidays. during sunday, the next batch of showers will come in from the english channel. on sunday, you could see a chance of catching an odd thunderstorm. pretty hit and miss, and many parts of the country will have a drier day, with temperatures between about 16 and 26 degrees or so. but a chance on sunday night and then on to bank holiday monday, that we will see some of the showers becoming a bit more extensive. some uncertainty about their exact positioning. again, it looks like they will work gradually north and east across the country as we had through bank holiday monday. they will be hit and miss. not everywhere will get a heavy or thundery shower. and it is a return to some sunny skies and the south. definitely not as hot as we get to bank holiday monday. a cooler and fresh outlook as we have through into the course of tuesday and wednesday. have a good weekend. welcome to bbc news, broadcasting to

viewers in north america and around the globe. my name is gavin grey. our top stories: tracking down the terror network surrounding the manchester bomber — uk police say they've made "immense progress." they're very significant, these arrests. we're very happy we've got our hands around some of the key players that we're concerned about. like i say, there's still a little bit more to do. more details emerge about the bomber. a former friend told the bbc his behaviour had changed in the last six months. generals in egypt for the coptic christians killed in an attack on friday. the country retaliates with airstrikes on libya.