This is what are the things that will make friday so special. Welcome to our viewers on Public Television in america and around the globe. The Islamic State stream is say they were behind the attack in tunisia on wednesday which left at least 23 people dead. The gunmen stormed the museum in the tunisian capital. Most of those killed were foreigners. Authorities have arrested nine people in connection with this attack. Our correspondent has the latest from tunisia. Reporter tunisias black wednesday has left its mark. The socalled Islamic State said that its gunmen carried out the attack. The gunmen took this into the museum. Then, when they got to this point, they started shooting. They headed down towards the museum itself. At this point, tourists would have heard the shots and the explosions and they would had just seconds to see if they could find a hiding place here. Tourists from japan, spain, australia, the u. K. , and italy were hit. They came in and sprayed bullets. A bullet grazed my side. Next to me were two people that did not move and others that were injured. Reporter a 57yearold, a solicitor from shropshire was killed in the attack. Her family says they are devastated. She and her husband had been on a cruise. This morning there ship left for barcelona. Robert has stayed here. Hes been helped by the british embassy. These terrorist attacks were an appalling and brutal outrage. I can confirm that one of those killed was a british citizen and our heart goes out to her family and we will do everything we can to help with the assistance and to help the family in this very difficult time. Reporter javier comella was killed as well as his mother. His father was the only one to survive. During the attack, tunisian mps found themselves trapped inside of the Parliament Building right next to the museum. They sang the Tunisian National anthem in defiance and i got out alive. And they got out alive. Imitators cheered for tunisia. This country faces difficult questions. It turns out that the authorities knew of one of the gun man. But they have done more to stop him and his accomplish. Katty the chief International Correspondent also in tunisia outside of the gates of the museum where that attack took place. I spoke to her earlier. What is happening in tunisia tonight after these arrests . Reporter it has been an actual ordinary day after the shock yesterday. It has been an actual ordinary extraordinary day after the shock yesterday. The trade unions, the Civil Society groups lawyers including women lawyers who came here and they took over this whole street and they mark streit and and they forced the security guards to open up the gate. With tunisian flags waving and saying, using the same phrase they used for years ago. A french phrase which means get out. They say this to the ruling party and now today, and some time to come, they will say this to terrorism. The Prime Minister is leading all of the political groups in the old city. Again, talking about unity in the face of a common threat. Katty James Reynolds raised the issue of whether the government should have done more to protect the museum. What are people saying about that . Reporter it is interesting because this is next to the heavily guarded parliament which they regard as having been a target of attack. To be fair, in the past few years, the attacks have tended to be outside of the capital largely against security forces. As we have been hearing, along the borders with algeria and with libya. They did not dare to believe that Something Like this, the most Famous Museum of ancient history visited by most tourists would be a target. Now, they know. Now they will have to consolidate around here. The barb wire, the police vans, will be here for some time. Katty tunisia is seen as the hopeful country. What is the mood there aside from this mood of defiance. Our people wary . Reporter tunisians like to believe that they are different and they are different. There is an element of Civil Society, even under authoritarian rule, even the rights for women. There is a functioning state including security forces. Powerful trade unions, that you normally dont see in many countries across north africa. Therefore, they believe that they can still be different although they must now be vigilant. Katty these offense in tunisia have put a new spotlight on cracking down on the spread of violence in this region. The french have set up a basis out of the libyan border hoping to cut off the supply routes that help if you miss groups operate. Our west africa correspondent has been given special access to the space and here is his report. Reporter out with the first light. Paratroopers from the foreign legion are on the move. This morning, they will advance through a bitterly cold desert wind. We joined them on the patrol. Their mission, searching for clues in this emptiness. This is about 100 kilometers to the libyan border. This is what the french call a great area because the authorities cannot control it. The group and the other militias control the border. The french are trying to secure this zone, to stop jihad he fighters and weapons from moving south. The last french outpost where soldiers keep a vigil. This is the gateway to libya. This is the easiest trafficking route. Goods, drugs, weapons, and migrants, it is all transited here. Jihad he groups and militia thrive on this lucrative business. We do catch weapons especially when we patrol in this area. We did not we go on patrol three or four times a month. Reporter the french ours stepping into the main hotspot. Concerned that legal trafficking will empower groups linked to al qaeda and the Islamic State. These armed groups may channel weapons into nigeria. There is also Drug Trafficking that funds terrorism. The operations are aimed at putting an end to these trafficking activities. There is the flow of the just tickle support that they can provide in nigeria and molly there is a flow of Logistical Support that they can provide in nigeria and mali. Reporter with the nigerian boko haram to the south had an expanding Islamic State to the north, the regional forecast does not bode well. Katty extraordinary images from the desert in niger. Yemens president has announced an attack on his compound as an attempted coup backed by the previous regime. The capital had been seized by the rebels. His predecessor was forced to step down three years ago. This has remained a key power in the country. President obama called Benjamin Netanyahu today to congratulate him on his recent reelection. Mr. Obama reaffirmed americas commitment to a two state solution to the israelipalestinian conflict. Both leaders agreed to continue discussions on a range of regional issues. Sierra leone is to impose a lock down an attempt to stem the flow of ebola. To an halfbillion people will be confined to their homes for three days. Two and a half Million People will be confined to their homes for three days. New cases are being recorded every week in sierra leone and in guinea. Some 30 additional attorney personnel have arrived in ukraine to provide medical and Tactical Training to troops. The ceasefire seems to be holding. Theres a split between the prorussian and those who believe in a united ukraine. We report from one of the divided regions. Reporter in war, you rarely witnessed a scene like this. Ella is reunited with her daughter and grandchildren. They had been living on different sides of the fighting in eastern ukraine. Im so happy that they have come back, ive not seen them. Reporter with the fragile ceasefire, the family is moving back home, to a neighborhood in the town now controlled by prorussian rebels and badly damaged. We want the kids to go back to school, we want to go back to work. My granddaughter to a first step and i wasnt there to see it. That was very hard. Reporter not very far away people are forced to wait. Outside this local government building. She tells us she cannot get to her home. She says this is the seventh time that this comes here and she finally makes it inside. She hopes to get a precious pass. The checkpoints mark the only road that is still open. People living on either side of this divide see the war in very different ways. Yelena decided to leave her house and has been in rebel held territory. Her husbands prorussian. But, she supports the claim government. For me, i have nothing to lose anymore. My home is 300 kilometers from here. All i have is my rock, my daughter. Reporter the guns are generally quite. They still point east towards the front line that separates families and tears relationships. Katty you are watching bbc world news america, still to come. Rio de janeiro prepares for the olympics, pollution could be a problem. A pakistani teenager who was flown to the u. K. For surgery after being shot by the taliban has been speaking to the bbc. He was shot at a school back in december. His brother and 100 ready people survived. He survived by prepending to be dead. He was flown to the u. K. Foreign operation and is now on the road to recovery. Reporter safe with his family. He survived the telegrams intent i show myself to them. They think that he is died. Reporter he is now recovering after he was flown here for surgery. By the physical therapy, the normal life can also play a role in the development of my hand. Reporter the family continues to received Death Threats for the taliban, it might be a while before he returns to taliban. He will continue with his education and will enroll in a nearby school at easter. I want to become a doctor. After this in turn, i want to be in the army, in the military that will save pakistan. To save pakistan from terrorism and other things. Reporter they might be unsure about what the future holds but for the moment, they are happy that the worst is over. Katty getting rid of the olympics is a huge task. Will the stadiums be ready as a securitys tight enough . When it comes to the summer games, there is the added issue of water sports and that means water quality. The bbc has seen startling evidence which suggests that the polluted waters will be nowhere clear enough for next years games. Our correspondent has the story. Reporter rios olympic park is shaping up. From a distance, it looks but he spectacular, but a close the view and smell is much less appealing. With deadlines looming, the waters around the park have been completely neglected. A black river of untreated sewage leads to chemically overloaded lime green lagoon. This biologist tells me that every river around here is practically dead. They are full of sewage. The situation is equally critical just up the coast in the bay. An iconic backdrop for olympic sailing events but into which tons of untreated sewage flow every day. Some parts of the they are so polluted that they are devoid of oxygen and of life. While the solid waste produced by a city of 6 Million People blithely environment and is a hazard to those who use these waters. Over the last year, the epic hopefuls including the British Sailing Team have been training here knowing that local authorities promised that the bay is clean and safe by the time the games come around. There is a lot of debris and water which is really bad. You can get caught around the board, you slow down, and that is completely erratic across different people across the race course. Reporter rio state officials have admitted that a fleet of boats that skims the surface is mainly for show and that it has been ineffective. The situation is critical. This is one highly publicized but are decreed method of trying to stop solid waste getting into the bay. Nothing more than an old net which stops some detritus. Most of the sewage and waste gets through. This is nitrate, nitrites ammonia. Reporter the top scientist who readily test waters says that levels of harmful chemicals are higher than ever. Looks we have done this for the last 20 years and the trend is increasing. The pollution is increasing. Sometimes the level of nitrogen increased 25 per year. Reporter Authorities Say they are improving the treatment of sewage by 45 and that this water would be safe. Are they right . Of course not. They are not right. They know they are not right. Reporter finishing the olympic projects is a race against time. Extending the metro, building stadiums, and cleaning the citys waters. It is not easy the government tells me. The money is there and the water will be fined for the games. But, they avoid my specific questions about guarantees to clean 80 of sewage entering the bay. The ecosystem is complex and some areas are less polluted than others. The Olympic Games are also about legacy, leaving clean waters that residents can use and be proud of. Katty water that does not look million very appealing. Millions of people have the chance to view a rare celestial event but they will have to protect their eyes. The moon will cross the sun on friday. The best seats will be in northern europe, particularly in iceland and norway, where they are expecting a total Solar Eclipse. That is when the moon blocks out the sun completely. The chief astronomer at the Franklin Institute joins me a few a short time ago. You will be watching this . Guest i will be watching it online, that will be the best bet for many people. Katty if you are not in those far northern parts, what will you see . Guest you will see a portion of the sun covered by the disk of the moon. The closer you are to the total eclipse path which is far north but you will be able to see is you will see part of the disk of the moon. The farther south you go, the less of the effect you will see. The folks will have the grace opportunity to see the effect. If you have someone of for viewer some sort of viewer you will see quite an event. Katty the people far up north how rare is it . Guest there is the opportunity for a solo clips twice in the year. This is quite unusual. The last time a Solar Eclipse like this occurred near the vernal equinox was in 1662. It was kind of rare to see this. Katty that is why they are all camping out. Just guest you want to make sure you do whatever you can to catch of you of one, especially if it is close to what you where you live. Why is it so harmful to the eyes . Guest often people thinks that there is a deadly eclipse raise. It is the fact that when the moon covers the sun completely if you are observing your pupils dilate to the change in sunlight. Any small part of the sun as just as bright as the entire sun, so that shock of light can do damage to your eyes. Is never it faisal to look at a total eclipse without protection. Katty listen to the warning, children. You mention the spring equinox you mention the Solar Eclipse. We also have a super moon. What is that . Guest this is a situation where we have the moon, the closest approach to the earth. So, the moon can seem to appear larger than normal. Actually, the visual difference is not very much. It is not that big a difference. In fact, you could get the same effect if you watch the moon as it rises in full, anywhere along the horizon because it is near objects of known size, it will appear to be much larger and that is just an optical illusion. Katty thank you so much. For those people who have gone all the way up north to watch it we hope that the weather clears for you, the clouds this is, and we get a fantastic eclipse. For all of us, thank you for watching the program, do tune in again tomorrow. Make sense of International News at bbc. Com news. Funding of this presentation is made possible by the Freeman Foundation newmans own Foundation Giving all profits from newmans own to charity and pursuing the common good, kovler foundation, and mufg. Clunks we can do more when we work together. At mufg, our relationships span cultures and every industry across the globe. Success takes partnership and only through discipline and trust can we create something greater than ourselves. Mufg, we build relationships that build the world. Bbc world news america was presented by kcet los angeles. Coming up next on odd squad. I want you to show around an agent in training. You expect me to believe that 2 experienced agents cant keep their eye on one recruit . Where did he go . Ori growling hi im ori my name is agent odd squad is made possible in part by. A cooperative agreement with the u. S. Department of education, the corporation for public broadcastings ready to learn grant and by contributions to your pbs station from viewers like you. Thank you. Olive. This is my partner, agent otto. This is a glass half full. But back to otto and me. We work for an organization run by kids that investigates anything strange, weird and especially, odd. Our job is to put things right again. theme music whinnying ah hiyaa come on olive come on where are we going . who do we work for . We work for odd squad. Ms. Stevens, im happy to report weve found your runaway snowman. Sorry, we took so long. Hey, stacy. I havent seen him since i was 7. Hoho want to go play . Yah thanks, odd squad warms your heart, doesnt it . weird animal sound whats the problem ms. O . There you two are. Something very odd has not happened. Not happened . Yes. And because you have so much free time, i want you to show around an agent in training. Oh this is ori. I like smashed prunes with ketchup. Ha i love this kid. Whoa two real odd squad agents unless. Are they holograms . Can a hologram do this . Ai ai ai were not holograms learning about headquarters is oris last step before becoming a fulltime agent. But. I dont need to tell you how dangerous this place can be. Now, if youll excuse me ive got my own tour to give. Come on, people once, i made shoes out of bananas. Nice ok, why dont we get on with the tour . Alright, ori, welcome to the most sophisticated place on earth. Its a place of wonder and amazement where longlasting friendship is made and dreams what does this do . Hey