this is bbc news. the headlines: us police say they've detained a suspect after a mass shooting at a july the fourth parade in a chicago suburb which killed at least six people. officers said a 22—year—old male was taken into custody following a brief car pursuit. more than 30 others were wounded in the shooting. the focus of russia's advance in eastern ukraine is expected to shift to the donetsk region after kyiv withdrew its forces from its last foothold in neighbouring luhansk. an adviser to the ukrainian defence ministry said the retreat from lysychansk had been a tactical redeployment to new defensive lines. dutch farmers have been carrying out a day of protests, angered by government plans that may require them to use less fertiliser

and reduce livestock. they blocked a major road near the border with belgium and also blocked supermarket distribution centres. ministers want to reduce harmful nitrogen compounds. sir keir starmer has announced a major shift in the party's stance on brexit. he says he becomes prime minister at the next general election he won't take the uk back into the single market or restore freedom of movement, or rejoin the customs union with the eu. for more on that, our political editor, chris mason. applause. 2019, and keir starmer is greeted as a hero for turning up greeted as a hero for turning up at a rally calling for another brexit referendum. he wanted a second boat and he wanted a second boat and he wanted to win just like he wanted to win just like he wanted in 2016. but that was then. this is now. under labour, and

will not go back into the eu. we will not be joining the single market or the customs union. , , , ., , single market or the customs union. , , ., , ., ., single market or the customs union. , , ., ., union. just three years ago you are advocating _ union. just three years ago you are advocating for— union. just three years ago you are advocating for another - are advocating for another referendum and advocating for a remote to remain. what has changed? what we can't do is reopen all of those arguments, all of those divisions, but it is all about mate central mission about mate central mission about growing the economy. what do you actually believe? is it what you said three years ago or what you say now? we have left the eu _ or what you say now? we have left the eu now. _ or what you say now? we have left the eu now. it— or what you say now? we have left the eu now. it is— or what you say now? we have left the eu now. it is really - left the eu now. it is really about unblocking all of the bits of the conservative brexit deal that are holding us back. at the last election, labour lost loads and loads of seeds that it had held for decades, those that had voted leave in the brexit referendum. places like this in greater manchester. i like this in greater manchester. ., �* , manchester. i don't trust them because they _ manchester. i don't trust them because they are _ manchester. i don't trust them because they are all— manchester. i don't trust them because they are all for- because they are all for staying and before. now they are quite happy to turn the tables? , ., �* ~' tables? number, i don't think so. we tables? number, i don't think s0- we are — tables? number, i don't think so. we are too _ tables? number, i don't think so. we are too far—

tables? number, i don't think so. we are too far down - tables? number, i don't think so. we are too far down the i so. we are too far down the line — so. we are too far down the line to — so. we are too far down the line to do _ so. we are too far down the line to do anything different. despite _ line to do anything different. despite all the mess we are in from _ despite all the mess we are in from brexit. _ despite all the mess we are in from brexit, we _ despite all the mess we are in from brexit, we still— despite all the mess we are in from brexit, we still don't- from brexit, we still don't want _ from brexit, we still don't want to— from brexit, we still don't want to go— from brexit, we still don't want to go through - from brexit, we still don't want to go through it - from brexit, we still don't want to go through it all. want to go through it all again. _ want to go through it all again, change— want to go through it all again, change it- want to go through it all again, change it back. l again, change it back. not _ again, change it back. not everyone - again, change it back. not everyone in - again, change it back. not everyone in the l again, change it back. - not everyone in the labour party is convinced that sir keir starmer�*s ideas good one. the mayor of london reckoned that being in the single market which ansto—mac pressing goods and services between countries as good as good as within them would be weathered. we as good as good as within them would be weathered.— as good as good as within them would be weathered. we can't go back into the _ would be weathered. we can't go back into the european _ would be weathered. we can't go back into the european union, i back into the european union, the british public are spoken. we can do though is actually to the list worst option.— the list worst option. but, remember _ the list worst option. but, remember that _ the list worst option. but, remember that circular i the list worst option. but, i remember that circular could the list worst option. but, remember that circular could be out, his career over any day now, overthis, out, his career over any day now, over this, a korean beer he had last year in an office during covid restrictions. he saysis during covid restrictions. he says is he is fine he will resign. you two your careers in the hands of the police. do you contemplate that any given day could be your last

islamic leader? there is nothing i'm afraid. —— last labour leader. the man who dreamt of overturning brexit and a second boat now categorically making peace with it. expect soon his broader economic vision, if he is still in the job. chris mason, bbc news. now on bbc news, the travel show. this week: iam i am looking at how a river cleanup is getting on. and meet this little one. simon is here to give you tips on travelling, despite the cost—of—living crisis. travelling through germany on what i regard as the best rail deal ever. and a day trip to a thai prison

anyone? this week, i am and a day trip to a thai prison anyone? this week, iam in and a day trip to a thai prison anyone? this week, i am in the ancient wetlands in the south of mexico city, unesco world heritage list and one of the country's must see destinations. this sprawling network of canals was first built by the aztecs and stretches over 180 kilometres. not surprisingly, the area it now attracts masses of tourists every year. check out all of these amazing boats. they are so colourful. i am here to meet

carlos diaz, one of the best tour guides in town. but, this isn't your typical sedate trip along the river. i was honestly expecting to go on a quiet little boat ride, but displays is a real fiesta. little boat ride, but displays is a realfiesta. we little boat ride, but displays is a real fiesta. we are stuffed in a trafficjam of ten different boats! tourist boats, shopping boats. floating band boats. singing.

woohoo! applause. away from the joyful chaos, i want to talk to carlos about life on the canals. that's if i can keep us dry, of course! how important is tourism to xochimilco? how has the area changed in that time?

i mean, having grown up here in this area, how do you feel when you notice all these changes? but the problem is much bigger thanjust tourism. these wetlands are the lungs of mexico city, and provide the capital with around a third of its drinking water and a huge amount of food. professor rodriguez—vasquez has been monitoring this pollution, and it is pretty plain to see

why this situation is getting worse. this isn't the most beautiful spot in mexico city, is it? yeah. can you tell me exactly just how badly the water is contaminated here? it is very highly contaminated with pathogens, chemicals, pesticides, hormones and human waste also. wow. yeah. and here we have a lot of places like this. so this is not the only drain like this in mexico city. no, no, no, we have a lot. wow. not only does this pollution contaminate the water, but the dangerous pathogens can also evaporate into the air and be absorbed into the crops that are grown in the wetlands. you know, the moment you leave behind the super busy embarcaderos of xochimilco, it feels like you enter a completely different world.

there is so much wildlife here, so much greenery, it's just so serene. but even out here in the more remote areas of the wetlands, the pollution is endangering one of mexico's most iconic animals. the strange looking but much loved axolotl. what's so special about these little creatures?

i can't believe this is happening. i'm about to hold an axolotl! oh my god, it is so smooth, it is so lovely, it's like holding a baby! the axolotl is not only endemic to mexico, its population is limited to these wetlands. and the worsening pollution is threatening its very survival. this is the most incredible thing i have ever done in my life. 0k, put him back! thankfully the conservation project armando runs here has been a great success, and as a result axolotl numbers are now increasing across the wetlands. armando's work is brilliant,

but to fully restore the area to its former glory, ultimately the pollution needs to be tackled. luckily my friend professor rodriguez—vasquez mayjust have identified a simple but effective solution. in a rather basic looking lab in the wetlands, her team have invented a system that produces tiny bubbles called nano—bubbles, which can be pumped into the polluted water. how does the science behind this actually work? yeah. we create the nano—bubbles with solar energy, so these nano—bubbles can attack or can destroy the contaminants. as well as tackling the pollution, these nano—bubbles also help to oxygenate the water, breathing life again into the waterways. honestly your lab looks, everything here looks pretty simple.

yeah, it is very simple. it is very cheap, and also very easy to manage. that is the best kind of technology, right? when it is simple, straightforward, accessible and sustainable. exactly, sustainable. and what's even more encouraging is that this simple but effective technology can be used on trajineras, so the tourist boats can be a part of the solution in the fight against pollution. that's the button that starts it all? all right, let's do it! ready? yeah. you can see the nano—bubbles. oh, it's working! that's so cool! it's amazing to think that this piece of tech is actually cleaning the canals as we speak. amazing, hey?

what these projects across the wetlands hopefully show is that with a bit of creativity and collaboration, tourists can play a key role in helping to maintain stunning places like this. and that's got to be good news. and if you're planning a trip here anytime soon, here's a few things to think about. in western mexico, the world's largest gathering of mariachi bands will come together on 30 august to kick off a two—week festival dedicated to the country's most traditional folk music.

the celebrations will begin with a huge parade through the city of guadalajara where mariachi bands from as far away as japan will all play together. you can expect workshops, lectures and plenty of inescapable impromptu performances throughout the city for the duration of the festival. if you prefer the calm of the ocean, why not explore the second largest barrier reef in the world? the mesoamerican barrier reef runs along the caribbean coastline of the yucatan peninsula and is home to 66 species of coral, several hundred species of fish, as well as sea turtles, dolphins and whale sharks. rememberthough, reef environments are fragile to human impact, so be sure to dive with a responsible provider. for six days from 1a october, some of the world's finest classic cars will be covering over 3,000 kilometres on a route from oaxaca to durango for la carrera panamericana. celebrating its 35th year, the pan—american race is one of the most important

and longest road rally type races in the world. celebrating its 35th year, the pan—american race is one it used to be dubbed the most dangerous, but safety standards have come a long way in recent years. and of course, if you are in mexico on 1—2 november, then you won't be able to avoid one of the country's guest then you won't be able to avoid one of the country's biggest events. more commonly known as the day of the dead, or dia de los muertos, the national holiday honours the deceased, and many believe that on this day, the border between the spirit world and the real world dissolves, and so relatives often spend the night by the graves of their loved ones. stay with us, because still to come, simon has some cost—saving travel tips. if you are flying, then try to travel with cabin baggage only. and thailand opens its prison doors to tourists.

so don't go away. hello and welcome to this month's guide. well, summer is here and many of us are desperate to get away. but with rising costs and tricky travelling, the prospect can be off—putting. after some scenes of airport chaos, airlines have trimmed millions of seats from their planned summer schedules, causing fares on some popular routes to soar. so, consider going by sea. britain has excellent ferry links to france, spain, the netherlands and ireland. there is loads of capacity this summer, and you can get some really good rail sale deals, such as about £40,

one—way, from many british stations to ireland, and you get a generous baggage allowance. if you are flying, then try to travel with cabin baggage only. i managejust with this, and it meets all known airline rules. you won't need to queue up to check—in, there is no chance of your bag being sent to the far side of the earth, and no need to wait around at the carousel at the far end when you should be beginning your adventure. best of all, you'll save cash. and choose your day of travel carefully. for holiday flights, saturday and sunday are in strongest demand, with friday and monday also busy. tuesday and wednesday are likely to see the lowest fares and the thinnest crowds. many viewers have been in touch about car rental rates. yes, they are higher than ever this summer. during the pandemic, many car rental firms sold off their fleets and now, they cannot get enough vehicles to match demand. so, choose somewhere with excellent public transport to stretch your holiday budget.

along spain's costa blanca and costa del sol, as well as the portuguese algarve, there are excellent coastal railways, with frequent trains, and subsidised fares, making them excellent value. almost anywhere in asia, from eastern turkey to singapore, public transport is cheaper, more reliable and safer than self—drive. choose the train when you can, such as the amazing line through uzbekistan, paralleling the silk road from bukhara to samarkand and on to the capital tashkent. if you are on the road, simply choose the highest category of coach you can afford. america is in love with the highway, but increasingly, the cities have reliable public transport connections, such as the brightline link,

from miami via fort lauderdale, and soon opening all the way to orlando. and long—distance buses are making a comeback, with one firm promising a privatejet experience on the four—hour run from washington to new york city. this summer, i'm travelling by train through germany on what i regard as the best rail deal ever. in the entire month ofjuly or august, you payjust nine euros for a ticket, taking you anywhere in the country on all but the fastest trains. the ticket is also valid on city transport, meaning you can experience the amazing dangling tram of wuppertal — the closest public transport gets to a theme park ride. to stretch your holiday funds the furthest, though, swap the med for the baltic beaches of eastern europe. a trip to the coast of poland, lithuania, latvia or estonia is surprisingly affordable.

and the black sea coastline of romania and bulgaria also offer outstanding value. going west, canada is significantly cheaper than the us, though in both nations, remember, you are now expected to tip 20%. for further fun adventures, wait until later in the year for tropical sun at affordable prices. two favourites of mine are the beaches and heritage of kerala in southern india and the long—time backpacker favourite vietnam. airfares in november in the uk are barely half what they are in peak summer. well, i hope some of those ideas have stimulated your travel appetite, whether you are hoping to warm up or cool off this summer. where there is a will, there is a way. good luck.

thanks, simon! ok, next up, we're off to thailand where the government is slowly turning some of its prisons into tourist attractions. rayong central prison, close to the capital bangkok, one of the first to open, and we've been given special permission to go along and film there to check out what tourists can expect to see.

thailand has traditionally treated prisons as no—go areas. they're not terrible sanitary, they're usually overcrowded. i think that the department of corrections wants to be seen as, you know, joining a wider coalition of government agencies encouraging tourism, encouraging people to come back to thailand. they're certainly going to have to somehow improve conditions in some ways — at least on the surface — but the question is whether anything really changes.

well, that's it for this week, but coming up next time — we're in sydney, as its most iconic landmark celebrates its 90th birthday. never gets old. this is amazing. and we hear about its role in bridging the gap between australia's different communities. more australians are supporting that the aboriginal flag sits atop of the sydney harbour bridge. if you can't wait for that, check us out on social media. search bbc travel show on facebook and instagram, and look for the little blue logo. until then, from the chaos of xochimilco, safe travels and i'll see you very soon. bye— bye!

hello, there. are conditions for northern ireland, wales and the best of the sunshine perhaps the further east you are, the best of the warmth into the south—east, 23 degrees is not out of the question. a similar

story as we move into wednesday. the high pressure still with us, the weather front could bring some significant rain into the far north—west of england —— scotland for a time and behind that it will introduce somewhat milder, more humid conditions generally through the country. some outbreaks of showery rain in the north west, gladys goes to scotland and northern england, the best of the sunshine and the warmth further south with highs of 2a degrees.

this is bbc news, i'm david eades. our top stories: police in chicago arrest a suspect, following a mass shooting at a july the fourth parade. gunfire at least six people were killed when a gunman on a rooftop opened fire on crowds celebrating independence day. a day dedicated to freedom has put into stark relief the one freedom we as a nation refuse to uphold, the freedom of our fellow citizens to live without the daily fear of gun violence. explosion president putin orders his forces to push on with their

offensive in eastern ukraine — after seizing control