talk to us on twitter and facebook. come back, we'll have more "america tonight" tomorrow. >> protesters are back on the streets as police look for those responsible for shooting. welcome to al jazeera, live from our headquarters in doha. also coming up in the next 30 minutes the difference between life and death now it's harder than ever to get supplies into syria. a giant in the world of fantasy literature has died. we look back at the life of terry pratchard.

and new hope in the fight against alzheimer's disease. >> we begin in the u.s. where authorities are search forgive those hyped the shooting of two police officers in the city much ferguson missouri. they have called it defenseless and repugnant. it's just hours after the police chief resigned following a report of widespread abuse within the police department. we're live in ferguson watching all of the developments. what is the latest, kristen on the investigation? >> well, county police are investigating the shooting that tack place right behind me outside of the city police department. they're also in charge of policing the demonstrators outside of the police department

as well. on the investigation front they've been questioning suspects, questioning people, but they say at this point they do not have have any one charge. they have not named the suspect as of yet. the situation outside of the police department is much calmer than it was a short time ago. the demonstrators were back out in force. they mostly have gone home for the night now but they were in the streets once again trying to block traffic and disrupt business as usual in the city of ferguson. although, being very peaceful about the way they did things, the police officers seem to be very--trying very hard to defuse the situation. they took different approach having the county police officers here instead of the ferguson plaintiff's here seem to have kept things a bit calmer. they've come out not in riot gear but with no helmets on and

wearing regular uniforms. they can be seen milling about with the demonstrators in the street, and things went off without an arrest this evening. it is midnight now much quieter than it was earlier and it is just about 24 hours now since those shots range out here. >> the investigation is far from complete, but the police chief from st. louis county says one thing is clear outside of the ferguson the police station. >> this is really an ambush. that's what it really is. you can't see it coming, you don't know what is happening and you're defenseless. >> demonstrators who gathered outside and then the gunshots. >> a cop got shot. >> this is the account of a photo journalist who had been packing up when the shots rang out. >> as we were about to pack our cameras up we heard what we thought were fireworks.

it turns out it happened three more times and it was gunfire. we saw the muzzle fire from the gun at the top of the street. we just ducked down. once we ducked down, we saw the cop was shot right next to us. >> the prison say they saw muzzle flashes 114 meters away from their position. they believe a handgun were used. two police officers were hit one in the head, one in the shoulder. both have been released from the hospital. dozens of people gathered earlier in the evening from what local reports described as a tense demonstration with protesters blocking traffic. the attorney general had this to say. >> this was not someone who was trying to bring healing to ferguson. this is a punk, someone who in a community that has been fractured too long long. >> the family of michael brown

were adamant that this would not effect their struggle. >> we specifically denounce the action of stand alonage staters who unsuccessfully try to derail the peaceful and non-violent movement throughout this nation that has emerged throughout this nation to confront police brutality and to forward the cause of the equality under the law for all. >> they said that the shooting will not deter them from the reforms they have been seek forgive months now. the recent report from the justice department showing widespread systemic racism in the department highlighting the needs for it. at the same time the police department remain very focused on the two police officers who were shot and injured. finding out who did it, and making sure that 2 doesn't happen again. >> kristen.

thank you very much for that. our correspondent kristen saloomey. thank you. to other news, the country could descend into civil war trying to broker the deal to end the crisis there. houthi rebels captured the capitol and dissolved the government last month. [ gunfire ] >> reporter: this video appears to show shots being fired at a demonstration against the houthi coup in central yemen. according to protesters, at least one man was killed and five others wounded. demonstrations like these have become frequent after shia houthi fighters took over the country last month. this is a man africaed by the u.n. to stop yemen from falling further into chaos. he has been meeting all parties of yemen as well as regional powers. he said there is a real danger of yemen breaking up.

>> if there is no agreement there prospect is very bleak. it's a horrible crooks and that's why everybody is aware that every effort should be make to promote a peaceful way forward. >> reporter: but the houthi rebels do not seem convinced about the u.n.-brokered talks. >> will we see a positive position by the u.n.? the u.n. security council? some specific parties and groups? why is there a negative stance when it comes to pocketed revolutions. >> reporter: the houthies have launched military exercises near the border of saudi arabia and on thursday they agree heed to expand the sea port. developments like these.

president hadi is trying to create a power base from aden. many of the parliament is being held by the houthis, and the u.n. is call forgive their release. >> we're asking for them to play a positive role. but there are ministers under house arrest. second, by safeguarding the human rights of the yemeni. >> reporter: as more meetings on the country's future continue both inside and outside of the country, thousands of yemenis took to the streets demanding restoration of democracy. al jazeera. >> sri lanka's president said that ale set up a domestic inquiry into war crimes during the country's civil war. the u.n. investigators won't be involved despite the international pressure. the sri lankan separatists ended

a 26-year conflict. and the prime minister has arrived in sri lanka. trade and investment are expected to top the agenda. we have the latest from colombo. >> reporter: the indian prime minister narendra modi's visit return visit to sri lanka after last month after he took over president of the country. things had been somewhat tense between india and sri lanka especially considering it's close alliance with china and the sri lanka government staying very close to china almost antagonizing and raising concerns for the region for big

brother about india. here we see sri lanka building bridges and trying to foster that warmth once again. we saw a very warm welcome for the prime minister. he has a very packed schedule over the next two days. he'll be holding talks with the president, the prime minister, and holding talks in colombo as well as paying respects at the indian peace memorial. the indians were here to help the government fight the tamil tigers. tomorrow on even an even more historic visit we're told it's the first of any indian leader. this is a sign of emerging warmth between the two countries. >> haiti has set a date for it's overdue presidential elections. it will take place in august with the presidential election following in october.

parliament will and it's president was forced to resign after protests. haiti suffered an earthquake that left hundreds of thousands of people living in camps. still to come on the program, find out how to debate on limited access to a popular.

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>> good to have you with us. these are the top stories on al jazeera. the u.n. demonstrateors are back on the streets in ferguson month m, hours just after two police officers were shot and wounded. protesters are shouting "no justice, no peace" after the shooting of unarmed black teenageer michael brown. escalating violence is threatening to plunge yemen into civil war and splitting it in two. there have been u.n.-backed talks to try to end the violence. india's president narendra modi is visiting sri lanka.

the war is entering it's fifth year, the u.n. said that there are millions of people in besieged hard to reach areas in desperate need of aid and the threat of isil is making it harder for help to reach them. bernard smith reports. >> from the moment they're born most syrians are now reliant on foreign aid. here it means the difference between life and death. but now as of isil has emerged to take control of some areas in syria, security concerns make it difficult to get aid through. >> we say it's a shrinking humanitarian corridor. it's a common phrase. it is just more difficult to get supplies from here to there. and for sure going deep inside syria where we were able to get fairly easily get in, and the

governor on the east side of the country. now that road is trench treacherous. it's very, very dangerous. >> but it's not just fighting that stops aid from getting through. many of the governments and shares that supply aid groups will not allow help to be stent to isil-held areas. they fear it will be diverted to isil fighters. hand in hand is one group whose warehouse is in syria hints at the mammoth scale of aid needed in though country. set up at the start of the conflict, the group's founders thought it would be needed for only four or five months. >> it was just basic help. medical aid, they needed bandages they needed cotton or just really basic needs. >> it's gone from providing cotton, some bandages baby milk, to what?

>> into providing complete hospitals now. >> now hand in hand, preparing for the next ten years. and an alarming prospect, and at least because of the costs involved. this year the u.n. is appealing for $2.9 billion to help 12 million syrians more than half the population. the delivery also cross borders here turkey, iraq and jordan in territory that has become some of the most difficult in the world for aid agencies to operate in. last year the u.n. only got half the money it asked for to help syrians. donor fatigue is a real concern. but without those donors and the aid hey them, they worry about the next few years. >> it is believed that they have killed the leader of al-shabab

al-shabab. he's suspected of planning failed attacks on kenya's coast and the ugandan capitol last year. now the u.s. secret service is investigating two senior agents after a car crash from the white house. the pair are accused of bashing through the fence after drinking at a party. we have reports from washington, d.c. >> reporter: nothing unusual here now. all guards in place. the secret service doing its job. just last week, another embar racement for the service which attracts scandal like the white house attracts sightseers. two seniors left a party and drove their government car through a security embear air that had been set us because of the investigation of a

suspicious package. >> they were going to test the agents for their level of alcohol, but it was decided they would be sent home. the department of homeland security will be carrying out the investigation almost an outside eye looking at the inside of the security service. one of those under investigation is a top member of the president's protective detail. often pictured close to barack obama's side. the other agent a senior supervisor in the washington field office. this is the latest in a long line of embarrassment and security lapses for the secret service. in october of 2013 a woman was shot and killed by police after she ran a temporary security barrier outside of the white house. a man jumped the white house fence armed with a knife. fought off two dogs and got into the building itself before being

stopped. and in january a drone was found on the white house lawn. one former white house insider says there needs to be a change in culture and better vetting. >> if they're coming to the secret service they need to get rid of any anticipation of reliving their juvenile teenage years. no the secret service is not about sex, booze or playing football on the ground. it's about protecting the president of the united states with that kind of dignity and decorum that is fitting for the office. >> an investigation was under way just as clancy was appointed last month to take control of the secret service. this is the first tunnel test of his leadership, and a real test to see if things are changing for the organization, which should never attract headlines for doing its job. >> rescue workers in bangladesh are searching for survivorrers

after a factory collapsed. it was under construction at the time of the accident. about 150 people were working on the building when the roof cased in. a proposal to limit access to the anesthetic academy. the world health organization warns there could be public health risks in developing countries. we look at what the measure means for beam in people in bangladesh. >> ketamime has been used as an anesthetic. it's safe and easy to use. it is an an thesologists' drug of choice. >> it's cheap to buy and patients recover very quickly.

>> but doctors might soon have trouble getting their hands on this drug. that's because china is leading an effort in labeling etamine ketamine as an narcotic drug. >> it's not lake heroin where you have the physical urge to take it. where like ketamine, you want to take a break. it's a lot for the mind to handle. >> ketamine has side aeffects and long-time use can cause damage to the organs. >> in bangladesh, no one has abused ketamine. that's the word we're looking for, abusing ketamine. not a lot of people have done

that, so i think it's an i will logical thing to make it illegal, or to put a tax on it, or to restrict supply to hospitals. >> and many would say sales of the drug here are already under control. a year ago you could go to any pharmacy and ask for some ketamine, and they would give it to you no questions asked. but today pharmacists will ask for prescriptions making it harder for recreational users to get their hands on the drug. it could lead to shortages and it will be doctors and patients ever bangladesh oh who will suffer. >> writer terry pitrit was

famous for his disk world series 40 books set in a fantasy university. pratchett wrote more than 70 books and translated into 37 languages with sales topping 85 copies. he was britain's best selling author in the 1990s until surpassed by j.k. rauling. he was diagnosed with alzheimer's disease. >> he spoke to al jazeera about the matter. >> i would like to see assisted dying for those cases which are not yet--which may not be

considered controversial. >> reporter: now pratchett was honored in by queen elizabeth for services to literature. in his final moments he remained eloquent. he announced his death on twitter. he said he took death's arms and followed them through the doors and onto the black desert under the endless night. >> now scientists believe they have found a way to treat alzheimer's disease without drugs. 50million people around the world live with alzheimer's which causes severe memory loss, and there is no cure, but medication can slow its progression. the build up of plaque in the brain stops neurons from working properly. they say the technique completely cleared the plaque in 75% of mice, who then performed

better in memory tests. jeffrey hughes says that more work needs to be done before a treatment is possible. >> we're excited every time there is research that those hopes, there are 40 million people around the world living with the disease with little prospect yet of finding a cure. this is early stage research in australia. it's only been done on mice and it's a relatively small study. we're hopeful with month investment we'll be able to build on some of these early studies and really find the answer in years to come. yes, it's important to have hope in the future, but what's also important is to give better support to people living without alzheimer's disease today. too many people around the world don't get a diagnoses and too many people feel embarrassed and feel there is a stigma.

they're hidden away, lonely, forgotten, and they suffer in silence. >> i islands emergency services say cyclone pam to struggle flash flooding and landslides. it has been described as the most power storm to hit va next uatnuatu. it may not be the levels of cannes or venice, it's trying to increase its reach. >> it's an international film festival bringing a stark dose of reality to the proceedings.

director says it's the festival's duty to remember the country's brutal history. >> it's our way to contribute to our peace process through cinema. we can't have a long-lasting peace or build a different country if we don't know what has happened to us, if we don't remember if we don't understand the horrible things that have happened, that we're all responsible for. >> 53 films are competing in different categories in the week-long festival. while some of the films have already been shown in major festivals around the world they often have a hard time finding an audience back home. >> it's difficult to imagine anything further apart than war and poverty than the beautiful perfectly restored center of cartagena. but it's here that festival goers are lining up.

the problem for these films is that they often look distribution in columbia, and across latin america. something that starting this year promises to change. >> the festival is becoming a focal point throughout the continent. 430 professionals are expected this year. >> we want to recognize ourselves as latin america as a gigantic market of 600 million people who speak the same language. but it's difficult to circulate latin american films throughout latin america. >> they cut distributions deals throughout europe but struggled to do so in latin america. >> until people understand that cinemas also are seeing representative, understanding better who we are it will be difficult to change that. we need to form a new public. >> and for a week here in

cartagena filmmakers will discover the stories that this continent has to tell. al jazeera, at the cartagena film festival. >> and just a reminder now that you can always keep up to date with all of the news on our website. >> flash point ferguson ground zeer who is right, who is on. it's in the eye of the beholder. life. >> every single person, there was a weapon, my weapon, and