against protectionism at the 620 summit in buenos aires. on the first of its two days, the summit has also been marked by disagreements over climate change, and there have been fears the leaders may not be able to agree on a final communique. a magnitude—7 earthquake has struck the alaskan city of anchorage. several large aftershocks prompted a tsunami warning to be issued, but that has now been lifted. reports from the area suggest the quake damaged buildings and roads. it is not yet clear if there are any casualities. britain and three american states have launched investigations into the hacking of marriott international, one of the world's largest hotel chains. the company said the hackers stole information about 500 million customers. names, mailing address, phone and passport numbers and some credit card details were compromised. new figures obtained by the bbc reveal that almost one in four houses reserved for military families is standing empty. as britain battles a national housing crisis, there are more

than 11,000 vacant ministry of defence homes across the country, costing the taxpayer millions of pounds a year in rent and maintenance. angus crawford has the story. houses no—one calls home. thousands for military familes stand empty, some vandalised. many vacant for years. this looks like a lovely place to live, only no—one does. well, someone has told me some of these houses have been empty for more than a decade. on a former raf base in cambridgeshire, rows of family homes, but no families. for local councillor john morris, it beggars belief. i mean, it could be really nice. it could be a really nice family home, this. yeah, it's a crying shame.

i mean, locally, we've got 3,500 households on the housing register. more than 20 years ago, the military sold off almost all its family homes and agreed to rent them back, occupied or not. it's difficult to find the words to describe what a bad deal the mod have actually entered into. and there are many more across the uk, from cambridgeshire to west london, and canterbury in kent. here, vandals got to work as soon as the soldiers and theirfamilies moved out. the mod says it has to keep renting these properties in case it needs to move a military family in at short notice. but if you keep a place like this for too long, this is what can happen. someone has broken in and ripped out most of the piping and a lot of the electrical cabling. now, if you look in there, you can see that if a family is ever going to move back into this place, it is going to cost the taxpayer thousands of pounds to put right. and new figures show the real scale of the problem. across the uk, 11,310 military homes are currently empty,

costing at least £25 million a year. just a mile away, frankie and her daughter lily, who has never had a real home, starting life in a hostel, and they are still on the housing waiting list. it's completely crazy. they're just going to sit there rotting, basically, damaged. people like us could do with them. there's other families that could do with them. in a statement, the mod says it needs empty houses to manage up to 20,000 service family moves per year, but is working to bring down the vacancy rate through subletting and disposing of properties we know longer need. but for now, despite the uk's housing crisis, the government still paying to keep good homes empty. angus crawford, bbc news. now on bbc news, we have an investigation into china's hidden

camps, in 0urworld. look at best. wow. this is the story ofa look at best. wow. this is the story of a search. it is like a city. we are not being allowed to get this close to it at all. for something china doesn't want us to find. it is a story of broken families. broken faith. and thousands of missing muslims. satellites to see beyond what the human eye can see. and it is the story of the new evidence we found, despite the attem pts evidence we found, despite the atte m pts to evidence we found, despite the attempts to stop us. xinjiang, china's vast, far west, is

a place of beauty. and fear. checkpoints control the desert highways. and the region's towns and cities bristle with security. but there is something here they don't want the world to see. so it is 8:30am in the morning now,

and we have just arrived in this city. and straightaway as we left the train station, we've got one, two, and another one back there, three cars following us. we are here to look for evidence of the network of camps in which china is reported to be detaining hundreds of thousands of muslims. huge fences all around it, look. thousands of muslims. huge fences allaround it, look. high in thousands of muslims. huge fences all around it, look. high in these blue steel walls, in a former school, is what china calls are re— education centre. but it looks more like a prison. nearby, we find another. police station every few yards. 0utside, relatives queue up to visit. but any attempt to get out and film is quickly interrupted. so

this is as close as we are being allowed to get to one of these centres. well, it seems we are not being allowed to get this close to it at all. so, four—hour investigation, we are turning to images that china can't so easily block. satellite photos. last year, the school behind the blue fence had a foot or pitch. today, it's covered with what look like accommodation blocks. watchtowers are visible. 0n a cornerjust outside the camp tents, we try to speak to a family. what are you guys doing here? some officials tried to stop us filming. but another intervenes. let them speak, she says. i ask who they are visiting. my dad, he says. your dad

is in there. can we ask some questions? xinjiang's main muslim minority are known as the uighurs. their distinct identity and faith, and the history of separatism, has long made them a target of suspicion. now, we find many homes lock and deserted. estimates suggest as many as a million people may now be in the re—education camps. 0fficial notices say the missing are being looked after. but no one dares to speak. the constant monitoring and following seas to that. some uighurs, though, have found a

place of refuge in turkey. a place with tyres of language and faith. -- a place with tyres of language and faith. —— ties. just reciting an islamic verse was enough, this man says, to put him in a re—education camp. his family, he fears, is still in one. in general, how did the guards treat

the people inside? some of those we meet are too afraid, even here in turkey, to speak openly. this man says he was also put in a camp because of his religion. from three former inmates in three different camps, we hear three

similar accounts. and all are concerned about the fate of relatives they have left behind. the whole family. tell me about life there. what was the routine? those we have spoken to are the lucky ones. they fled to turkey in 2015. since then, there are very few reports of anyone being released from the camps at all. the testimony we have heard here is impossible to independently verify, of course, but what is striking other consistencies. the descriptions of the routines in the camps, the brainwashing techniques, and most tellingly, perhaps, the results. not love and loyalty for the chinese communist party, but a deep and

lasting resentment. china denies it is incarcerating muslims en masse. but state—run tv has been showing this footage. apparently willing adults in bright, clean classrooms being taught about the pitfalls of religious extremism. the message is clear. these are not detention centres, but vocational schools. in the old silk road city here, the government presents us with a tour guide. 0ur minders lurk a short way off, monitoring the conversation.

but we've seen notices on the door saying some people's relatives are being looked after. what does that mean? does it mean they've been taken away? nearby, chinese tourists are taking pictures of kashgar‘s main mosque. it has fallen silent with no sign of her. anywhere else in the world, you'd expect the central city mosque

like this one to be busy, bustling with worshippers. not here. if china's purpose is the eradication of islamic practice in xinjiang, it may be on the brink of succeeding. innermost thoughts must now be hidden. the mildest expression of islamic belief is at risk. beyond that the —— the veneer of normality, the ever—growing camps

await. as we arrive in this town, we are being followed as usual. we are looking for evidence of the huge network of re—education camps that china is building across its western region of xinjiang. and we are using satellite photos to help us. in 2015, this patch of desertjust outside da bancheng was 2015, this patch of desertjust outside dabancheng was empty. less than three years later, it looked like this. the giant compound is surrounded by a high wall with 16

watchtowers. we try to approach the site by car. look at this. it is being extended on a massive scale. it's like a city. but then, the police block our way. so here we are, justa police block our way. so here we are, just a few metres from the camp and as predicted, we've been stopped. if this really is all about education, then why the effort to stop us getting close? it's huge. it's huge. we ask a team of satellite analysts to help us understand what we found. taking a —— taking the original image from april this year, they overlap much more recent image. more than double. it's clear how much the site has grown. the team is also able to show

that this one camp as part of something much bigger, by identifying many other similar secure facilities right across xinjiang. plotting their growth over time showsjust xinjiang. plotting their growth over time shows just how fast they are being built. satellites see beyond what the human eye can see. as the yea rs pass, we what the human eye can see. as the years pass, we have detected the number of infrastructures being built, it increases and most significantly in the past two years. design experts give us their analysis of the layout of the giant camp at dabancheng. mail and female accommodation, administration buildings, even an isolation unit. it could now be one of the biggest detention facilities in the world. holding 11,000 inmates single rooms we re holding 11,000 inmates single rooms were used and as many as 130,000 if

the inmates were housed in dormitories. ethnic tension fuelled by resentment towards chinese rule has claimed hundreds of lives in xinjiang. in recent years, the violence has shown signs of spreading. this attack in beijing's tiananmen square killed two pedestrians. hundreds of uighurs are reported to have travelled to syria tojoin various reported to have travelled to syria to join various militant groups. the camps are a direct response. a giant system in city after city,

town after town and, for the detention of religious believers and, it seems, anyone with an overseas connection of any kind. the chinese government, they want to delete the uighur nation from the walls, they want we raise this nation. raila is a british uighur living in london. last year, her mother came to visit but soon after she returned to xinjiang, she was taken away. the 66—year—old mother is now thought to be in a camp, prove, her daughter says, of just how wide china's definition of extremism now is. as far as i know, they are targeting everybody, who has relatives abroad. just targeting each and every one. i'm just a

normal person. i am a student looking after my son. why are they detaining my mum, for what? for no reason. i don't know when i'm going to hear the voice. mahmoud is another british uighur who's watched helplessly as family members back home disappear. i'm just hoping they are alive, that is my first stop my sister is in prison. she was a tv presenter and she was the government employee. she had done nothing wrong. she is innocent. we are like

an egg. the chinese government is like a stone. they can crush you any time and they are so powerful. do you suspect that the international community may be scared of challenging china too hard? everybody, they don't want to lose china as a business wise. money is important but we are human. international pressure is beginning to mount. at a recent un hearing, western countries one by one expressed deep unease. we are very concerned about the treatment of ethnic minorities, including uighurs. translation: we recommend all re—education centres be closed in uighurareas. all re—education centres be closed in uighur areas. all detention, including mass unconstitutional... release those detained... unrestricted access to places of

internment in the reason —— the region... china, though, remains defiant. walmart chief we ask the chinese government to comment any evidence we uncovered on the ground the sky. —— we asked. this field outside kashgar has been transformed into a re—education camp in less than six months. we attempt to film one of them. we are forced to leave. as thousands are swept up into such facilities, families are being separated. when bilkis fled with her children, her baby daughter didn't have a passport. herfather stayed behind, planning to bring her later but now he has been taken away.

what is your view about what the chinese government is doing. we education, vocational training, suggests something limited and temporary our evidence shows the camps in prison is being used that purpose are large—scale and seemingly permanent. the question thenis seemingly permanent. the question then is word is all of this end and then is word is all of this end and the history of mass incarceration is, of offers some pretty ominous precedents. are they going to turn

its back yet? we make one final attempt to visit one final camp where, with hird, 10,000 attempt to visit one final camp where, with hird,10,000 people attempt to visit one final camp where, with hird, 10,000 people may be held. in front of us, the police closed the whole highway. for repair, they say. we try other routes but every time, at roadblock after roadblock, there is nowhere through. this takes us back to downtown. looking ahead to the all—important weekend weather prospects and it is going to be one of those weekends where there will be quite a bit of rain around, we will all see some wet weather at some point but choose your moments, there will be some dry spots as well. the weighing really targeting

england and wales on saturday. the heaviest rain across southern counties first thing in the morning although the rain will be reluctant to ease its way eastwards. it's in scotla nd to ease its way eastwards. it's in scotland will have the best at the weekend. item of sunshine to the north and east, further showers the highlands, and showers continue. while our main band of rain will slowly push its way eastwards, staying quite cloudy handed. sunshine coming out. highs of staying quite cloudy handed. sunshine coming out. highs 01:14 degrees. temperatures average further north and scotland. this is bbc world news. i'm reged ahmad. our top stories: world leaders gathered in buenos aires for the g20 summit are trying to overcome their differences on trade and climate change, but a final communique looks increasingly unlikely. a 7.0 magnitude earthquake hits alaska,

near the city of anchorage, causing widespread damage. a massive data breach at the marriott hotel group. hackers steal the personal details of hundreds of millions of customers. 50 years after its discovery, a team of scientists is trying to explore the mysteries of the world's largest sinkhole — the blue hole in belize.