small airlines restrict travel to sharm el sheikh, as it's warned a bomb may have brought down a russian plane over sinai. >> i'm laura kyle from doha. the british prime minister's comments overshadowed egyptian president abdul fatah al-sisi's visit to downing street. it's been marred by protests. plus, u.n. envoy to libya denies a conflict of interest after accepting a controversial job, and how did mars get dry.

scientists say they have cracked the mystery. let me go with the latest developments on the russian plane that crashed in the sinai desert and the mountain. france and belgium warned citizens against travelling to sharm el sheikh, where the airbus took off. they are halting flights to and from germany. and britain is advising travel to and from air. the government authorised flight to resume back to the u.k. thousands of british tourists are stranded there. they canfully home but can only take hand luggage. >> president obama is taking seriously that the airliner may have been brought down by a bomb. david cameron said it was more

than likely the cause. russia and egypt say it's premature. >> reporter: finely laid to rest. a canteen workers, and grandmother. as investigators increase the search area around where the flight came down, british and egyptian leaders met. the two men discussed coordinating efforts to fly 20,000 holiday makers home. >> we are ready to cooperate with procedures and issue security measures in place at sharm el sheikh are nust. and that they are safe to a good standard. >> britain had additional intelligence indicating that an affiliate could have been behind the disaster. we cannot be certain that the

airliner was brought down by a bomb. it looks like that was the case. russia maintains that any theory on the crab is speculation. the anger at not being party is palpable. >> it's surprising that it's not specialists or experts with people making public statements, but the chief of a foreign affairs ministry, and we were shocked to find out the british government has information that could shed light on what happened in mid air in egypt. another new piece of information. this video from an i.s.i.l. affiliate. following the suspension of all british flights to and from sharm el sheikh. the government sent in an aviation expert and a small military team, and they are putting measures in place and ensuring that everything going

on to the planes is screened. as a search continues for more remains. people are pinning their hopes on the data. hoping that would answer the questions of what happened in the final moments. the causes of the plane crash overshadowed a visit. they held talks in downing street. it was a highly anticipated visit. egypt's abdul fatah al-sisi arrived in downing street on thursday. the egyptian's leaders's trip started with unwelcome news. they suspended all flights. a popular holiday makers. outside downing street. hundreds of protesters. they protested a man accused of

killing thousands of citizens. >> we are saying abdul fatah al-sisi committed crimes against humanity. he should not be welcome and is a threat to security and stability. some demonstrators lay down outside the prime minister's residence, blocking the entrance. a symbolic protest to depict hundreds sentenced to death or killed since the 2013 coup. they were removed and arrested by police. >> the egyptian embassy mobilized people. on the other side of the road, those in support of abdul fatah al-sisi gathered. the message - the general is the only man that can protect egypt. david cameron came under a lot of criticism for inviting abdul fatah al-sisi. the head of the opposition in the u.k. said the visit show

contempt for human rights. it was no surprise the press conference was controlled by downing street. al jazeera was not allowed to attend. they were forced to ask questions from across the street when sis are left. abdul fatah al-sisi, when will you release the 40,000 political prisoners. when will you release the journalists in gaol. when will you release the political prisoners in egypt? why don't you want to answer these questions. unfortunately as you see the issue of human rights has not been at the forefront of the agenda. rather prime minister cameron and abdul fatah al-sisi chose to focus on security trade and other things. that caused a lot of anger amongst a lot of people opposed to the visit. >> david cameron shouldn't have let abdul fatah al-sisi walk out the door.

of number 10 without talking about human rights. they are key to regional security. abdul fatah al-sisi is expected to return to cairo on friday and may view the trip as reinforcing his position as a statesman. with protests taking place in many foreign capitals, opposition to his ceremony is widespread. a former middle east analyst at the u.s. state department says people in egypt are divided on the role of abdul fatah al-sisi as leader. national security is taking precedence right now. >> i think the british and the egyptians see the national interests of working together and - in the recognition that abdul fatah al-sisi is the legitimate government and need to work with him. it's in their interests. it's not to say there's issues of human rights, that said, they

took a secondary role to the national security interests of both nations. >> one person has been killed, had 45 missing in brazil after a dam burst, flooding a mine and homes. it happened near mariano, 200km north of rio de janeiro. locals have been told to evacuate to higher ground. the dam was built to hold back water. >> energy company exxonmobile is being investigated over whether it misled the public over climate change. the new york attorney-general ordered exxon to hand over records and documents. it will look into whether the company funded groups that opposed science. the company is assessing its response, and says it recognises climate change is real. >> a confidential report by the global chemical weapons watchdog found mustard gas is being used

in syria. according to al jazeera sources, it will be used in the northern town. it's the first confirmation of the gas in syria since the county agreed to destroy the chemical weapons stockpile. a man working for the united arab emirates supporting the un-backed government. >> reporter: bernard eeno, the outgoing u.n. envoy to libya giving a last briefing on the fragile situation in the country. >> while i have always remained hopeful about the chances of libya's leaders reaching a peaceful agreement. >> it was over chateaued by lyon himself, spending a year to bring about a power-sharing agreement between the two self-declared governments.

at the same time lyon was negotiating a high paying job with united arab emirates, a packer of the house of representatives government in the talks with their rival, the general national congress. it's called into question lyon's impartiality and the president sent a letter to ban ki-moon saying in part: we asked him about that. the g.n.c. sent a letter to the security council, questioning your impartiality gin your upcoming job with the u.a.e. and say it could put in shep di the political -- jeopardy the political process you put in place.

>> i assume my party of what is going on. i don't want to focus on other numbers. if the optics are not correct i'm here to say maybe i could have done things in a different way. >> he is backed and the secretary-general - if he feels he needs to give an explanation to the g.n.c. and libyans? >> i think mr lons tireless work to reach an accord speaks for itself. throughout the process he has been criticized from one side or the other. >> his agreement is it in the

final stages. as a new special envoy takes up a job in the next few days, the first step could be to repair the credibility of the process at a critical time. >> still to come on the programme... ..we are in greece, where refugees forced to flee their homes are finding something to smile about. plus... >> the world architecture festival is under way, i'll tell you why the 2000 delegates gathered to discuss the issues about design in the presence and the future. i'll tell you why the bam boo was in and concrete is out.

hello again, the top stories on al jazeera. european airlines warn against travel to sharm el sheikh. france, belgium and britain are concerned about security after a crash on saturday. the british prime minister says it's likely a bomb bought down the plane in london hundreds protested against abdul fatah al-sisi. he met david cameron at downing street. he's been accused of human rights abuses the outgoing united nations envoy to libya denied that he is bias. libya criticised his acceptance of a role in the united arab emirates dema.

>> the u.n. refugee agencies is expecting 5,000 migrants to arrive on shore. the prime minister visited the island of lesbos. he spoke about the need for an agreement. the registration process must be given in turkey, not greece. >> i think the key issue is not to encourage the people to take the risk to lose their life in the sea. and the only way is to give the hope that some day they will have the chance to be this mechanism for settlement from the court to europe. >> attention assist turning to the drama that the refugee crisis is inflicting. one group is using humour to provide comfort and psychological support to those

in need for a short while, the children were transported. overcome with all-consuming joy that made them forget unrelenting sadness. >> it's been a long time. my daughter lost a father. she is recovering. >> on lesbos, enjoyment is in a short supply. >> most of the children have been camped out in the parks lot for days, this is a much-needed dose of levity for a group of kids two accustomed to hardship. desperation runs as deep in young refugees as in the old. >> we need love regardless where we are. you need laughter, i need laughter and everybody needs laughter. >> as many as six shows a day

are put on by clowns without borders, all over the island. >> this 9-year-old may have escaped it off with her family, she's not escaped a reality used to get harsher by the hour. number today. >> they are telling me that they had so much fun and danced and got here three days ago and this is the first time they smiled since they got here. >> for the better part of an hour, fits of giggles replaced tears, making a difference for children that experienced so much death and destruction, turned upside down. >> this little boy is one of dozens telling us how much fun they are having. >> once the show is over they

cheer for the clowns. no one here wants this though end. with the passing performance, they see how traumatized the audience is. >> there's one other thing that happened. we were performing, and a helicopter past by and a kid's face turned into, like, a horrified scared face and took two kids down and like, it's airplane, airplane, put your head down. and i saw this in this one fraction of a second. the horror, when we were performing. i went to hug him, i said "okay, it's a helicopter, we are doing a clown show and he went back and danced again.

it's so - it's so painful to see things like that, a pain whose size a larger than the children, combined with a trauma faster than they do. they are resilient. when hope is gone, strength only lasts so long in romania, tens of thousands of people took to the streets of bucharest for a third night. protesting against government corruption, the demonstrations against nightclub fire. the prime minister and his cabinet resigned on wednesday, he'd been under pressure over charges of fraud, tax evasion and money laundering. >> an antigas lift demonstration turned violent. a police car set on fire. thousands were associated with a

group called anonymous. 28 were arrested. >> now, the homes and offices of the future may not look like anything like they do now. the eighth annual architectural festival has been held in sink more. they are showing a tries of things to come. >> reporter: the world's most creative architects gathered in singapore. 2,200 professionals are here with the creations that they have built, will build and hope to build in the future. all are up for scrutiny and awards. the annual world architecture festival is the largest gathering, helping to shape the way we think about the way we think work and spend leisure time. what it has is a body of the knowledge, a system of thinking, is a way of some commonality of

the experience across the world, and they are ways it can give issue. >> while the professionals are in discussion and debate, the next generation is waiting in the wings. these are the finalists. their challenge to accept the future of locations based on the past and potential use. universities of singapore and london's westminster are working on the business in singapore. >> analysing the buildings and the area, we can see things that we have no common with them, or that we pick up on that we don't. so it gives us a different perspective. it's a good collaboration, we learn from each other as well. >> the 5-star hotel used to be the post office. the challenge is not just about design, but working as a team. the future is on the mind of the

finalist. gomez from spain, his skyscraper tipped as a winner in the category we are joined live from singapore. interesting ideas showcased there. yes, it's the first time i have come to the festival. it's fascinating to look at. 30 categories are up from awards from buildings that are built and exist, that are in preparation and will be built. there's those in the future. it's not an opportunity for architects to have a holiday and give themselves a pat on the backs. important issues are discussed. they don't live in a bubble. joining me is paul finch. good to have you with us. >> good to be here. >> a main theme coming out of the festival this year is the environment. we are heading to france where

the french president will discuss issues of the environment. how does it impact on the confident in the hall here? >> it has a big impact. we are looking to raise buildings from the ground level in areas where there's bound to be flooding and higher watertables, and then the far greater impact of increasing heat. how do you try to sign heat in the buildings, cut the iran emissions and that's been a big issue, and different countries and different climates many different responses from architecture. comparing and contrasting what people are doing is interesting. >> the difference between countries and conferences is evident. some of the pictures here are elaborate and show space used at its optimum. but space is difficult. and expensive in the metropolitan cities such as new york, tokyo, london. how do they address cheap

accommodation. they are addressing it with great difficulty and the problem of affordable housing in the center of our great city is more and more intractable. the answer appears to be that you need political will to provide housing at prices people can afford. having said that, how do you accommodate increasing populations in the cities. it's an architectural issue and planning issue. one answer is to build higher, if you build towers next to each other, as happens in many parts of the world you lose yited and a sense of space in your own city. all you see is taller buildings. the answer is to build densely and taller, but to create greater amenity in landscape, and also at the tops of buildings and in terraces so as

in singapore, you can end up with more than 100% of groundcover. putting it into the building. >> paul finch, director of the world architecture festival. the day continues with a gala dinner, and two awards will be given. to the building of the year and future building of the year, we'll have tom time after 14 g.m.t. we'll be waiting for those. >> los angeles new president has been sworn in. several african heads of states, but the main opposition coalition boycotted the poll results. the victory has been overshadowed by a semiautonomous zanzibar region. the election will go to a run

off. none of the 54 ran a majority. there are reports one man held a run off between the top of two in december. mexico is preparing for a state visit from raul kavt re, the first time that a cuban leader visits the country, he is due to arrive and meet the mexican president peno nieto. >> n.a.s.a. scientists know they know why mars which ha active flowing water is dry. the atmosphere has been stripped away by solar winds, the latest in a series of findings about the surface of the red planet. jacob ward has more. >> to know why mars is cold, desolate, cold and try, you need to under the sun. scientists announced the planet's thick atmosphere, making it warm and wet was

stripped away by the powerful solar storms. today's less active son penetrated mars, leaving it vulnerable. blasts of gas, magnetic particles. the result was the disappearance of water and life. >> most of the stripping by the solar wind was thought to have taken place early in the history of the solar system when the sun was more active. when the solar wind was intense, today the raid of loss at mars is low. >> the spacecraft known as mefen entered the orbit last september. n.a.s.a. says maven documented a solar storm eating away at system in march. among the major findings was the discovery of water on morse. we have vis you will evidence that ancient mars had enough

water to support microbial life. so much so it looked similar to earth. >> when we looked at mars, we see a different surface, one that has a valley, lakes. we see an environment able to support liquid water. solar storms are less active today. >> as for a chance that earth could suffer the same fate. during the time earth might be losing atmosphere, the rate of loss would be low. and pope francis released his first music album entitled wake up.

the c.d. featuring the argentinian pontiff's voice over music. the 11 tracks included parts of the speeches, themes including peace, attention, need, faith and family. more on