i'm reena ninan. we begin with a possible break into the investigation of the crash of egyptair flight 804. sources in the u.s. and egypt tell cbs news the plane's flight data recorders, or black boxes, have been located but not yet retrieved in the area where wreckage from the plane has turned up. conflicting reports say the devices have not been located. the plane went down thursday, killing all 66 people on board. holly williams is in alexandria, egypt. >> reporter: the first images of debris from egyptair flight 804 show the plane's wreckage-- a life vest and luggage. egyptian authorities say human remains were also found in the several area in the southern mediterranean sea, where they're still looking for more wreckage and the bodies of those who were on board. the plane's flight recorders, or sold black boxes, could help answer what happened on the passenger jet with recordings from the cockpit in the minutes before the plane crashed. phillip balm is the editor of aviation magazine. >> presumably, they were desperately trying to aviate or fly the aircraft and recover it. we'll also get all of the readings from all of the different pieces of equipment on board the aircraft, which should give us an indication of what was going wrong. >> reporter: it was after 2:00 a.m. local time on thursday that the plane suddenly swerved, turning 90 degrees to the left, then spinning in a circle to the right, all the while plummeting, falling off the radar and into the water. data published by avherald, an aviation industry web site, appears to list automated transmissions from the airplane just before it disappeared from radar screens. they indicate smoke in the bathroom and in the avionics bay, then alerts from the plan's flight control systems. >> it implies there was something more significant that took place. it's very rare that you will a fire that will simply, you know, take over the aircraft and result in the aircraft actually, ultimately, crashing in the space of three minute. >> reporter: according to aviation experts, a loss of pressure could also have set off the smoke alarms. mechanical failure, human error, and terrorism are all possible causes of this crash. and, reena, so far, none of have been ruled out. >> ninan: holly williams in alexandria. thank you. more on the egyptair investigation we turn now to mark phillips at charles de gaulle airport in france. >> reporter: there were 15 french citizens among the passengers on the plane. as it happens, just this morning here, the french foreign minister, jeans marc ayrault, met with about 100 family members of the victims, and i'm afraid he could not provide the answers that they were looking for, despite new information that has been coming from the signals sent from the plane. the phrase that the french are using here is that there is still no favored hypothesis. in other words, they're keeping all the of their options open. here at charles de gaulle, they've tightened security. they're doing an investigation to see whether there could have been anything untoward put on that plane, but thus far, there are no conclusion that score, either. >> ninan: mark phillips at charles de gaulle airport in france, mark, thank you. and there's breaking news tonight from afghanistan where the u.s. military carried out an airstrike targeting taliban leader akhtar mansour. officials are not confirmed that manned sour was killed in the attack near the pakistani border pain gunman who caused a security scare at the white house friday remains in the hospital. authorities say jesse oliveri of ashland, pennsylvania, approached a checkpoint and refused to drop his gun before secret service officers shot him. a source tells us olveery may have been attempting a so-called suicide by cop. gun control is once again a major issue in the race for the presidency after donald trump was endorsed by the national rifle association friday. hillary clinton has an event in florida today, addressing mothers who lost children to gun violence. here's julianna goldman. >> crooked hillary clinton is the most antigun, anti-second amendment candidate ever to run for office. >> reporter: around with his n.r.a. endorsement, donald trump spent less time detailing his own gun proposals and instead tore into hillary clinton. >> hillary wants to disarm vulnerable americans in high-crime neighborhoods whether it's a young, single mom in florida or a grandmother in ohio. >> reporter: clinton hit back tweeting, "you're wrong, donald trump, we can uphold second amendment rights while preventing senseless gun violence." with a majority of voters saying gun policy is important in the november election, trump and clinton are drawing their battle lines. >> the gun lobby is the most powerful lobby in washington. >> reporter: the democratic front-runner has called for stricter gun laws, including universal background checks, and gun-free zones for schools and public facilities. >> they have figured out how to intimidate elected officials at all levels who basically just stop thinking about this problem because they're too scared to stand up to the n.r.a. >> reporter: trump is proposing getting rid of gun-free zones, cas hauled for making conceal carry permits valid across the country and is against an assault rifle ban. but after the sandy hook elementary school massacre, trump applauded president obama's speech calling for stricter gun laws tweeting, "president obama spoke for me and every american." tonight, clinton will be at an event with parents who have lost children to gun violence, including the mother of trayvon martin. reena. >> ninan: julianna goldman in washington. thank you. george zimmerman has apparently sold the gun he used to kill trayvon martin. a man in daytona, florida, bid $150,000 for the gun and said he thought he won the auction, but zimmerman later claimed someone else offered $250,000. zimmerman's web site says the auction is over and the winning bidder is being contacted. the c.d.c. says 279 pregnant women in the u.s. and its territories have tested positive for the zika virus. most zika cases in the u.s. so far have been in people who traveled frotraveled from latint health officials expect mosquito-borne enfekses will occur here soon. ceeps news chief medical correspondent dr. jon lapook is here. we're talking about more than 150 pregnant women who have tested positive for the zika virus. >> reporter: right here in the united states. >> ninan: right here in america. how concerned should women be? >> reporter: perspective, first of all. these are the women who have gotten the zika virus because of travel, because they went somewhere else, they got infected down in, say, brazil and came back up to here. in a few cases there has been sexual transmission. so far we don't know of a case from a mosquito in the united states biting someone who is uninfected and giving them what is called local transmission of zika. if thams, there is going to be a lot of concern. >> ninan: on how will we know if mosquitos, when they are infected with the zika virus? >> reporter: we may not know right away, and that lag is something that is of concern to public health officials. i mean, if that happens, somebody comes from brazil, say, they come up here, they've got zika in their blood. they infect a local mosquito, that mosquito bites somebody else. since 80% of the time we think people have no symptoms, that person may go around having zika in their blood without us knowing it, and then another mosquito may bite that person and get infected and we start having local transmissions. what public health people are doing is setting traps. we were down in houston in harris county, and they went out there and put traps in the sewers and traps in the wetlands. it's doing carbon dioxide, and certain types of chemicals and they get attracted and come in. they take them, they smooive them up, they take thim to a lab and say what's inside? what kind of viruses? if they find a zik zika virus ia local mosquito, they sound the alarm. >> ninan: a new york city police officer is under investigation after cell phone video showed him pointing his gun at a crowd of people watching officers make an arrest. demarco morgan has the latest. >> reporter: this cell phone video shows plainclothes officer risel martin arrested 21-year-old deyshawn bettway, suspected of riding an illegal dirt bike. >> his head is in between his legs and he's sweding. >> reporter: ronnie pinkerton recorded the video from his cell phone. you see the officer pull out his gun and point it at bystanders. >> when i saw the gun, my heart raced a little bit. i was like is he really going to shoot? is he going to shoot right now? >> reporter: in a separate video taken just a few moments later, martinez is seen punching spectators in the face. >> he looked like he was going somewhere else. >> jahnico harvey was charged with menaces and disorderly conduct. >> it's just another example how police can, honestly, do whatever they want and get away with it. >> reporter: the officer seen point higz gun and delivering that sucker punch has been stripped of his gun and badge and placed on modified assignment while the nation's largest police department investigates his actions. reena. >> ninan: cell phones documenting so much now, memarco. a san francisco police chief was forced out of office this past week over accusation of racial bias in the police department. carter evans tells us about the challenge of new chief is facing. >> you got a good captain. >> reporter: acting san francisco police chief toney chaplin has his work cut out for him. >> reforms, reforms, reforms. >> reporter: chaplain took on the job thursday after mayor ed lee told embattled chief greg suhr it was time to step down. >> the progress we have made has been meaningful but it hasn't been fast enough. >> reporter: the move came within hours of the city's latest officer-involved shooting where san francisco police killed an unarmed 29-year-old woman suspected of stealing a car. thursday's shooting was the latest in a string of racially charged incidents that have sparked outrage in the bay area. the protests gained momentum after this video surfaced last december. >> oh, my god! drop it! >> reporter: police opened fire on a man holding a knife. five officers fired more than 20 shots. >> oh, my god! >> reporter: court documents also reveal several officers exchanged text messages littered with racist language. chaplain, a 26-year veteran of the san francisco police, was already leading a task force to reform the department, and there are two things he wants to implement immediately. >> the body camera rollout so we have another set of eyes. and the other thing is our use-of-force policy. >> reporter: the acting chief has the support of the police union and the n.a.a.c.p. but, reena, chaplain still won't say if he's willing to be the city's permanent police chief. >> ninan: carter evans in los angeles. thank you. a giant fuel tank from the defunct space shuttle program was slowly hauled through the streets of los angeles today. it will be displayed at california's science center along with the retired shuttle "endeavour." it was shipped to california from louisiana through the panama canal. a solar-powered plane is flying to dayton, ohio, tonight. solar impulse two took off from tulsa, oklahoma this morning on the latest leg of its journey around the world. coming up, wildlife rangers take drastic action to save rhinos from poachers when the cbs weekend news continues. ♪ ♪ that's life. you diet. you exercise. and if you still need help lowering your blood sugar... ...this is jardiance. along with diet and exercise... jardiance works around the clock... to lower blood sugar in adults with type 2 diabetes. this can help you lower blood sugar and a1c. and although it's not for weight loss or lowering systolic blood pressure, jardiance could 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but dehorning the rhinos could save their lives. they're not in any pain. it's like filing a human nail. >> 25. >> reporter: this rhino horn is what this war is being fought over. it is still so valuable to poachers that even after it's been removed, it is immediately whisked off the property and taken to a secret location out of the reach of criminal syndicates. in some parts of asia, the rhinos' horn sells for about $150,000. veterinarian mike toft. >> i would rather see this little guy upright in two years' time than in a ditch upside down dead having had his horn poached. for me it's a no brainer. >> reporter: the rhinos are sprayed with a purple disinfectant, the mark of survival. >> another all right, we're ready to wake up. he's looking, looking 100%. he's nice and relaxed. >> reporter: the horn will grow back in a few years, although it will become increasingly rare to see a rhino with its horn on this reserve. but it may be the only way to save the species. debora patta, cbs 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(children giggle) symbicort. breathe better starting within 5 minutes. call or go online to learn more about a free trial offer. if you can't afford your medication, astrazeneca may be able to help. >> ninan: how far should america go to prevent another terror attack? nocial security is at the forfront for the race for president. tonight "48 hours" presents "the spymasters: c.i.a. in the crosshairs." 12 c.i.a. directors offer candid views on the war against terrorism. >> i found that i was making decisions on life and death. >> are you now free to engage the vehicle. >> those decisions are never easy, and, frankly, they shouldn't be easy. >> anything except full confidence. >> the keepers of america's secrets, the spymasters, shared for the first time their passionate disagreements about the agency's past, its current mission, and its future. >> let me bare my soul just a little bit more. >> in a conflict against a ruthless enemy, what are the rules for america's spymasters? >> clear to engage. >> does the c.i.a. go too far? >> going to town, man. >> or not far enough? >> we have people chopping the heads off christians. i would bring back waterboarding, and i'd bring back a hell of a lot worse. >> if some future president is going to decide to waterboard, he better bring his own bucket because he's going to have to do it himself. the agency is not going to do this again. >> our constitution does prohibit cruel and unusual treatment. if it's cruel, we shouldn't be doing it. >> the question people need to ask themselveses is 10 years from now will people be asking them the same questions about the use of these drones? >> this administration prefers killing terrorists rather than capture them. >> he is killing more people than he needs to, and we'd be better off capturing some of them and interrogating them. >> these are tough decisions, but, you know, this is a war. god forbid this country faced another 9/11. you know what the first question would be-- "why the hell did you let this happen? why the hell did you let this happen?" >> ninan: you can watch "48 hours presents the spymasters" tonight on cbs. it is a coproduction of shotime and cbs news. on the eve of president obama's arrival in vietnam, the ghosts of saigon. with usaa is awesome. homeowners insurance life insurance automobile insurance i spent 20 years active duty they still refer to me as "gunnery sergeant" when i call being a usaa member because of my service in the military to pass that on to my kids something that makes me happy my name is roger zapata and i'm a usaa member for life. usaa. we know what it means to serve. get an insurance quote and see why 92% of our members plan to stay for life. try cool mint zantac. hey, need fast heartburn relief? 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>> prison. it's a nice, fancy word for a prison. >> reporter: bien made it to the u.s. in 1979, married, got a job, and discovered a talent for woodworking. herrington continued on with his army career. >> there wasn't an april that went by for the better part of 37 years that i didn't think about that. what would i say to one of these people if i ever met them. >> reporter: then he got a phone call. >> i said, "stu, this is bien pho. i don't think you know me. but evidence one of the ones that got left behind." >> and i felt like i at least needed to explain and apologize, but he wasn't really wanting explanations or apologies as much as to call me up and to say, "i'm okay. i did fine. and don't worry about it." >> reporter: it's now been 41 years since herrington ended the vietnam war with his cheap little lie to bien pho. but seeing them walk together past the vietnam memorial tells you the only way to really end a war is through forgiveness. david martin, cbs news, washington. >> ninan: forgiveness, they say, an attribute of the strong. and that's cbs weekend news for this saturday. the news continues now on our 24-hour digital network, cbs "n," at cbsnews.com. i'm reena ninan in new york. from all of us at cbs news, thank you for joining us. good night. captioning sponsored by cbs >> announcer: the following program is sponsored by operation smile. every three minutes, a child is born with cleft lip or cleft palate. in many countries, they can't get the surgery they need. >> interpreter: i feel bad when they stare at her. they say, "look how ugly she is." i feel very happy. i don't know how to explain it. she looks brand-new. >> interpreter: he gets upset when he drinks because it falls out of his mouth. before, he looked so different, but now he looks good, and that makes me happy. he's very handsome now. >> interpreter: people say he was born like a monster. we have prayed for this moment to happen. he's gorgeous, precious - very precious.

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