satellite images appear to show mass graves outside of mariupol. an adviser to the mayor says they show mass graves. but cnn cannot independently verify those claims. and the discovery happening as the heavy fighting continues in the port city. an estimated 100,000 people, both soldiers and civilians, trapped amid the relentless russian onslaught. one small boy praying for a miracle. >>. >> translator: i want toss the sun so when our houses are rebuilt, we can live in peace, so we can live in ukraine, because this is our native home. another humanitarian corridor opening in mariupol as civilians try to escape the fighting. russia capturing dozens of small towns in the east, but uk officials say russians have not made any major gains in the last 24 hours. russia also revealing its mission for the invasion, top military officials say they plan to take full control over southern ukraine and the eastern donbas region. let's bring in scott mcclain who is in lviv. what details are we learning about the photos that appear to show mass graves? >> reporter: this is in an area to the east of mariupol. it's in an existing cemetery. most of the graves don't look like they've been touched for quite a long time. but there are these new trenches that have been dug. the earth is freshly disturbed. they're 40, 45 yards long each and there are several rows of them. local officials there in mariupol say this is evidence of mass graves being dug. cnn can't verify that, but it would not be the first time that that accusation has been made, just a few days ago, there was a similar accusation made this time to the west of mariupol. again, in an existing cemetery. there was rows of freshly dug graves about 200 of them or so. the ukrainians put the death toll in mariupol since the war again at around 20,000. there's no way for us to independently verify that number considering the state of the city. obviously there has been widespread destruction of buildings. but the human toll, though, is not quite yet known. >> and then let's talk about this evacuation corridor. it is supposed to open today. but what do people feel about whether that's true or not? >> reporter: yeah, this is what ukrainian officials were saying is that this evacuation corridor would open and begin at a mall on the western edge of the city. we don't have an update as to whether that corridor has been successful, whether or not anyone has been able to get out. they did say that in addition to buses, people would be allowed to join that convoy with their own private vehicles. but only women and children would be allowed. again, these things have been hit or miss since the beginning of the war. some have been successful, many others have not been. ukrainian officials warned right off the bat that -- warn people that russian troops may try to push people in the opposite direction, opening a so-called parallel corridor to push people into russia and we've met people who have had to go that direction simply because they didn't know where else to go and they simply wanted to be able to get to safety. this corridor, though, is a long way from the steel plant. that is where ukrainian troops are making their last stand. it is also where women and children are sheltering underground in this deep facility. and that is where ukrainian troops released a video from today showing children who have been underground for almost two months now, some of them have been pleading just to see the sun. just to be able to get out of there, simply. frederica. >> so sad. scott, there was also some shelling taking place in mykolayiv. does this have anything to do with what the russian military strategy or the new phase is all about in the southern portion of the country? >> so the strikes that we've seen as of late seem to line up with the strategy that the russians have made public. according to this military commander who spoke with russian state media, they would like to have full control of the eastern donbas region and also the southern coast of ukraine as well to link up with moldova. and specifically, the separatist region of moldova. that's not going well with the moll moldovans. city officials say that there have been about 20 injuries over the last two days. there have also been missile strikes today in odesa, the southern port city, which seems a long way from the front lines. but military facility there was hit in addition to two residential facilities. this in addition to more fighting in the east. sort of paints this picture that the russians are telegraphing exactly what they would like to accomplish here in ukraine. >> all right, scott mcclain in lviv, thanks so much. we'll check back with you. as the war rages on, aid continues to pour in from around the world. joining me right now is the president and ceo of project hope and just returned to the u.s. after visiting ukraine. robbie, so good to see you. >> thank you for having me. >> you went to kyiv and surrounding areas include bucha. you saw the devastation in those places firsthand. tell me about what you witnessed. >> yeah, i went to kyiv and irpin and bucha and what i saw was heartbreaking. m more than half of irpin has been destroyed. hospitals have been attacked, windows have been blown out and the same thing in bucha. more than half of bucha has been destroyed as well. but i also saw how committed ukrainians are to go to pass through this. doctors and nurses working around the clock trying to help people. i visited the mass grave at the back of the church as well and it was sad to see what ukrainians are going through. >> and then of the survivors, these ukrainians that you have come across, i mean, what are their stories? what have they witnessed? how are they explaining how they've survived this? >> i mean, i went -- i visited a trauma ward in kyiv and i saw a lot of the war casualties, most of them were civilians. women, elderly men. they were injured just walking down the street or by sniper fire or by unexploded ordnance or bomb and they said they just want to live and they survived because of the goodness of other ukrainians who helped them, because of doctors and nurses who were committed to staying behind and helping them. i mean, i saw a 63-year-old woman who was shot in the arm as she was walking by and the bullet went from the arm to the chest and she was just basically walking with her hands up, just to get through the fighting lines. and this is the story of almost every ukrainian that i met that came either from irpin or bucha or some other areas like kharkiv as well. >> tell me the ways that project hope is able to assist. what's been the focus? >> right from the start, we've been sending medicines -- medical supplies, trauma kits to hospitals throughout ukraine and kyiv and lviv, kharkiv and irpin. right now we are rehabilitating the hospital that has been damaged by the war. and our focus is to really get medicine and medical supplies in for the doctors and nurses. but we're trying to focus on the mental health in ukraine as well as the surrounding countries. people have seen a lot. people have seen things that nobody should see in their lifetime and we're trying to help them cope with it, whether it's mental health assistance for doctors and nurses that have been there from day one, living in the hospital 24/7, or some of the people that have fled and seen the violence. >> what other tools and supplies are still needed in your view? >> everything. anything from basic medicines to insulin to bandages, trauma kits, i mean they're going through things very quickly. some supplies make it to kyiv or lviv and it's peaceful there, they're trying to send them to the front line like kharkiv as well or to the east and south. we're preparing for population movement from the east to the south based on attacks. so we're trying to preposition supplies in all of those areas. we're trying to help those doctors and nurses cope with the situation. >> and i know you have been focused on helping others, but now that you're stateside and reflecting on your entire journey, is there a way to express how it has impacted you? >> i mean, i grew up in a civil war. i'm originally from lebanon and i was 4 when the war started. and i work in many different war zones. and seeing those images in ukraine obviously brought back painful memories of living in lebanon when i was a kid and even my younger years. and knowing how much people need help is what drives us. it's what drives project hope to continue working in places like ukraine. and we're committed to stay there for the long haul. this is a sprint and a marathon. as long as we're needed, we will continue to stay in ukraine. >> robbie of project hope, thank you so much. i know the people there are very grateful for all that you and your teams are doing. thanks so much for being with us. >> thank you. all right, russia's aggression is worsening on the ground and also potentially in cyberspace. a non-profit in switzerland received a string of malicious links on their cell phones after publishing a report last month on russian attacks on hospitals in ukraine. but this isn't the first cyberattack on the aid group's involved in the war. joining me right now is cnn's cybersecurity reporter. is it the case, indeed, that these attacks are coming from russia? >> sometimes it's hard to pin down, frederica. in the case that you mentioned of the non-profit in switzerland, i interviewed the director and she suspects that they may have come from russia but can't be sure. the fact is they began -- as they've never received many cyberthreats, but just so happens after they publish a report documenting some of the atrocities committed -- allegedly committed by russian forces in ukraine, they start receiving a flood of this -- of malicious links and she told me that it was basically designed to intimidate her colleagues and it's not working, they're continuing to carry out their work. but it was sort of a rude awakening to the landscape out there in terms of cyberthreats to humanitarian groups that don't necessarily have the resources to deal with them always. >> so if intimidation is one of the goals, are there other goals that come with these attacks? >> sure, there's a range of types of hacking aimed at any organizations, but in this case, humanitarian organizations. we also documented some cases of espionage, cyberespionage, meaning not disrupting the computer networks but lurking on them, surveilling them. one case that we spotlighted, i believe possibly the belarusian government was behind this, trying to surveil european government officials and their efforts to help refugees fleeing ukraine. and the working theory is there's an effort by the belarusians to use that information they gather to spread disinformation about antirefugee sentiment in europe. that's another example of what can be done when this data is exposed. >> cybersecurity experts are concerned that scammers or spies could be using data from non-profits and other entities exposed during the war. what harm ultimately will it be doing? >> it's -- i mean, any time you have vulnerable people whose data might be accessed, it can be used years down the road for scamming someone. could try to impersonate you and conduct identity threat. in the case of intelligence services in russia or belarus, the concern is retaliation for political activists. before the war started, there was a lot of concern that the russians would go after that data and try to target people with that. so there's an array of things that could happen, unfortunately, frederica. >> thanks so much. coming up, republican lawmakers, marjorie taylor greene and kevin mccarthy, are facing questions about the january 6th insurrection. details straight ahead. >> announcer: "cnn newsroom" brought to you by -- and this is the sound of better breathing. fasenra is a different kind of asthma medication. it's not a steroid or inhaler. fasenra is an add- treatment for asthma driven by eosinophils. it's one maintenance dose every 8 weeks. it helps prevent asthma attacks, improve breathing, and lower use of oral steroids. nearly 7 out of 10 adults with asthma may have elevated eosinophils. fasenra is designed to target and remove them. fasenra is not a rescue medication or for other eosinophilic conditions. fasenra may cause allergic reactions. get help right away if you have swelling of your face, mouth, and tongue, or trouble breathing. don't stop your asthma treatments unless your doctor tells you to. tell your doctor if you have a parasitic infection or your asthma worsens. headache and sore throat may occur. this is the sound of fasenra. ask your doctor about fasenra. cal: our confident forever plan is possible with a cfp® professional. a cfp® professional can help you build a complete financial plan. visit letsmakeaplan.org to find your cfp® professional. ♪ you're probably thinking that these two are in some sort of lover's quarrel. no, no, no. they're both invested... in green energy. and also each other. digital tools so impressive, you just can't stop. what would you like the power to do? 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>> i've had a few discussions. my gut tells me no. but what i think i'm going to do is i'm going to call him. >> reporter: before that audio was leaked, mccarthy denied "the times" reporting as totally false and wrong. the fallout from january 6th also playing out in a georgia courtroom during a hearing about representative marjorie taylor greene potentially being disqualified for running for re-election over the insurrection. lawyers representing voters challenging greene argued she helped facilitate violence at the capitol, but greene's argue her rights are being violated. >> the question of voter fraud in the 2020 election, it was a -- is a quintessential example of political speech, legitimate political disagreements about what happened. >> reporter: greene, who still pushes the big lie that trump won the election and denied ever opposing a peaceful transition of power, testified for more than three hours repeatedly saying she does not remember many key events or even her own actions leading up to january 6th. >> my question is just about whether anybody at all ever mentioned to you the possibility of violence. >> i don't remember. i don't recall. >> they were going to flood the capitol with people. >> no. i don't remember ever hearing that. no, i do not remember that. >> reporter: the judge who presided over friday's hearing will ultimately make a recommendation to the georgia secretary of state about whether greene should be disqualified. as for representative mccarthy, he's expected to address his colleagues next wednesday. some republicans tell cnn they expect he might face some uncomfortable questions, but ultimately they expect this controversy will blow over. paula reid, cnn, washington. and still to come, across the u.s., some cities and local transit authorities are reinstating orders requiring masks on public transportation after a federal judge struck down the public transportation mask mandate. we will discuss with a physician and professor of emergency medicine after this. eyes on the ball baby. digital tools so impressivive, you just c can't stop. what would you like the power to do? 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fewer groceries. this phone? more groceries! this phone? fewer concert tickets. this phone? more concert tickets. and not just for my shows. switch to xfinity mobile for half the price of verizon. that's a savings of over $500 a year. switch today. this weekend the most populous county in america is bringing back some mask mandates. los angeles county reinstating an order requiring masks on public transportation. the county says covid-19 cases have jumped to over 2,000 per day, the highest level since february. that order comes just days after a federal judge struck down a federal mask mandate for planes and other mass transit. the doj is appealing that decision. joining us now to talk about all of this is professor of emergency medicine for oregon health and science university. always good to see you. >> good morning, fred. good to be on with you. >> cases have gone up in l.a. county but are still relatively low. do you agree with this new mask mandate there? >> i do. it really sounds like l.a. county is doing exactly what health departments are supposed to be doing, which is be nimble and bring back some of these layered protections when it is for the good of the community. l.a. county public health officials also, i thought, summarized their rational really well. you know, they're still adhering by current cdc guidelines which have extended mask mandates until may 3rd. they kind of reject the idea that a judge with very little public health background has better thoughts or advice than our cdc. and they're also acknowledging, i think, what we should all be thinking of when it comes to public transit is that -- which is that these really need to be accessible spaces because they're used by 1 in 10 americans, many of them are essential workers who require this type of transportation to get to work. they are low income workers, people who have been hit the hardest in this pandemic and they deserve public spaces, particularly ones that are crowded that don't have great ventilation, and in order to feel that they can continue to pursue their live hoods, provide services without having to balance that without risk to themselves or family members who are as a rule vulnerable. >> and philadelphia renewed its indoor masking policy only to end it days later. do you think these kinds of back and forth decisions end up hurting the public health messaging? >> there really is so much pressure the minute that you put on any public health protections. this is why we have none in place right now. i mean, we have really liberalized things like masking, testing, proof of vaccination in pretty much every space. it's one space that some communities are trying to be consistent and asking people for the reasons i enumerated to, please, put on masks when we see things like uptick in cases and transmission and so i think it is really tough when there's so much pushback. i think we need to get better at saying this is what public health recommends right now and so we can get the things we want, which is keeping our businesses and cools open and our health care systems able to take care of the people. so it is unfortunate so much back and forth. >> the cdc does continue to recommend masks be worn on public transportation. should people be wearing masks on planes at this point or just should it simply be people's discretion? what would be your recommendation? >> well, i know we talk a lot about gauge your individual risk and do what's best for yourself. but i think, again, in these spaces, we need to think about how do we make it safe for everybody, including people who don't have a lot of choice. i mean, airplanes are one piece of that. but 34 million americans use ground transport during the weekday to get to work. it's not like you're in a place like a mall or grocery store where you have some ability to modify when you go how much distance you have between people. on public transit, you're kind of stuck and they are very crowded places. so i always think -- i'm not thinking about myself when i put on a mask. i'm thinking, what do i signal to other people, particularly those who have children under the age of 5, people could not get fully vaccinated or don't have access to quick health care in order to get some of these medications we have should they get ill. and so i'm just kind of thinking about what is my piece, the thing that i can do that isn't terribly complicated, expensive or difficult that will make the entire space safe, and i hope that people can think in those terms and consider continuing to wearing a mask. >> children under 5 still not eligible for a covid vaccine, and that represents 18 million people. is this taking a long time? >> it has felt really frustrating, especially because it seems like it's always just about to happen. it's always -- by the end of the month or the next month or within a short period of time and there have been a lot of hiccups. pfizer first looked at its two-dose series and decided to back off. moderna, data released in march and both of those companies have plans to present this data soon-ish to the fda. so i know it's been really frustrating for families. at the same time, we haven't done a great job in vaccinating our children, for example, the 5 to 11-year-old age group, vaccination really stalled out. the vast majority of those children have not received their vaccination series. as eager as we are for that, we have to think about how do we continue advancing vaccinations and get answers to parents who have questions or doubts about the vaccine even -- who are currently eligible because those same concerns will hamper the vaccine effort for the younger children when it comes out this summer, hopefully. >> doctor, always good to see you. thank you so much. >> appreciate you. a new study from providence health care system shows unvaccinated people who tested positive for covid developed roughly the same amount of protection against reinfection as those who had been vaccinated. but as cnn's dr. sanjay gupta explains, it's really not that simple. >> reporter: in this lab at emery university, scientists are working to answer one of the most common questions of the pandemic. how much protection does a previous covid infection provide? >> a vaccine response, you may have all individuals have high antibodies that wane over time. with infections, you'll have individuals that have low and individuals that have very high antibodies responses. >> reporter: take a look at this graph of people who have immunity from a prior infection. see how varied the blue dots and lines are. they represent the antibodies response. it's all over the place. it is proof he says that not all infections are the same. but with vaccines, a much more predictable, consistent antibody response. how do you use this data to make decisions in the real world? especially now that states have loosened measures like masks and vaccine mandates? >> if i were to get my antibodies checked, could i then get some sort of measure of just how protected i am? >> there aren't good groups of protection. something that says this is the measurement that one needs to know how well they are protected. with these variants, we're seeing how the antibody responses take a hit. >> reporter: let's say you're in a situation where someone doesn't have antibodies anymore, you were to measure their antibodies and you don't see them. does that mean they no longer have protection? >> not necessarily. so there's several aspects to one's immune system that can drive protection. >> reporter: like b-cells which can make more antibodies if the virus comes back and t-cells which help activate the immune system and get rid of infected cells. antibodies in your blood naturally wane over time. think of it like security lights at your home. when there's an intruder nearby, they should turn on. but when there's no more threat, you want them to turn back off. >> reporter: why do we focus so much on antibodies? >> one aspect is that antibodies are probably one of the easiest to measure in the laboratory. >> the immunity you get from prior covid infection has become way more politicized than anything i've ever seen in medicine. but it's still a very important medical question. >> reporter: this doctor is a transplant surgery who says antibody tests should be used in some cases to understand how protected people are. in february, he published research on hundreds of unvaccinated americans who had covid. >> almost every single one of them had detectable antibodies. >> reporter: and the science says if those people then later got vaccinated, they will have even more robust immunity than infection alone. it's something he thinks we do need to take into consideration. >> covid is a high-risk, high-consequence way of getting immunity. but if you had covid and you went through that and you have immunity, that is something we need to respect and we need to incorporate in the ways we draw the new social contract of covid. >> reporter: so there's no doubt that being previously infected can provide significant protection. the issue more is how consistent is it, how predictable is it. an older person who didn't get that from the original infection, they may not generate as many young antibodies as a young person who got very ill. you can't predict that. and getting infected comes with the risk of getting sick. developing long covid symptoms. as things stand now, about 95% of the country has some degree of immunity, that is a combination of being both vaccinated and infected. but, again, it's the vaccinated immunity that is going to be far safer. >> sanjay gupta, thank you so much. coming up, we will show you samples of the math textbooks florida education officials rejected citing that they said were references to critical race theory or other prohibited topics. you're probably thinking that these two are in some sort of lover's quarrel. no, no, no. they'reoth invested... in green energy. and also each other. digital tools so iressive, you st can't stop. what would you lik the power to do? 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it's a good thing he's so handsome. subway keeps refreshing and refre- florida education officials claim elementary school math books are being used to indotcom trin nate students. the state rejected 41% of the textbook submissions claiming they referenced critical race theory. here's more. >> reporter: these are the images released by florida's department of education, examples of what it finds too objectionable to be included in public school math books. one of the images that were sent to them by the public shows a bar graph measuring racial prejudice by political identification. another adding and subtracting a section that begins with, what, me, racist? it talks about racial prejudice and measuring bias. public school textbooks just the latest battleground in a culture war waged by ron desantis. >> there's outrageous things going on by using critical race theory to bring ideology and political activism to the forefront of education. >> reporter: florida's department of education says it's rejecting publishers attempts to indoctrinate students. some did not meet state standards. others incorporated prohibited topics or unsolicited strategies. >> it's interesting to see this ever-expanding umbrella under this fear-mongering campaign that is using critical race theory as the sort of trojan horse in education. >> reporter: another reason textbooks were rejected, references to social emotional learning in math. it's a practice that supports the social side of learning and emotional needs of children as described by the social and emotional learning. >> this is a fight about honestly next to nothing. a lot of this is inspired by political disputes and by political advantage. there's a vast industry in this country that uses contempt and hatred to divide us politically and i think sometimes that industry of division and contempt uses schools to advance its own aims. >> reporter: a "new york times" review of 21 of the rejected books found many of the textbooks included social emotional content but found little that touched on race or critical theory. a focus for the political playbook of a potential 2024 presidential candidate. >> nobody wants this crap. they're trying to shove it down the tlohroats of the american people. you're not doing that here in the state of florida. >> reporter: the department of education, florida's department of education, released these images that they received from the public. when i asked the press secretary for exact textbooks that these images came from, we never heard back. i have been talking quite a bit to florida math teachers, a handful of them, and many of them tell me that they're worried this will set them back, that they're worried this will now become a back-and-forth in an appeals process for the publishers with the state and they really just want to get their hands on the materials so they can start planning for the next school year. other top stories we're following this hour, the suspect in a shooting rampage that left four people wounded in washington, d.c., on friday is dead. police say they believe as the yet unidentified man took his own life in the apartment where he was found. they also recovered six firearms from inside that same apartment, including long guns, handguns and a multiple -- and multiple rounds of ammunition. police say they are still searching for a person of interest. 23-year-old raymond spencer who is not considered a suspect in this case. four people were also injured in two separate shootings near the indiana university campus early this morning. bloomington police say shots were fired around 1:00 a.m. near a nightclub where three men were shot. 20 minutes later, another person was shot two miles away. it's not clear whether the shootings are connected. and in new mexico, dry conditions and extreme wind gusts up to 65 miles per hour are fueling at least four dangerous wildfires in two counties east of santa fe. the fire has forced the evacuation of at least 20 communities in the county with another eight areas prepping to evacuate today. meanwhile, in san miguel county, the fire has burned 7,500 acres since april 6th. still ahead, the story of russian opposition leader alexey navalny and how he became one of putin's greatest enemies. merica. look at this guy. he bought those tickets on his credit cacard and he's r rackin' up the rewards. she's using zelle to pay him backk for the hot dogs he's about to buy. and the announcer? 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>> of course. 100%. >> reporter: cnn's clarissa ward and her team confronted a member of tsb's toxin team. [ speaking russian ] my name is clarissa ward. i work for cnn. can i ask you a couple of questions? [ speaking russian ] was it your team that poisoned navalny, please? >> reporter: five months after his poisoning, nalny returned to russia knowing what awaited him. >> i will go back i'm russian, i belong to this country. i would never give putin such a gift. >> reporter: he was arrested on arrival. in prison, he started a hunger strike. he was initially sentenced to 2 1/2 years for violating his probation, then another 9 were added for fraud and contempt of court charges, which putin critics say are clearly political. alex marquardt, cnn, washington. and you most definitely want to tune in to this all-new cnn film, "navalny" premiering sunday at 9:00 p.m. on cnn. he's finding some investment ideas with merrill. eyes on the ball baby. digital tools so impressive, you just can't stop. what would you like the power to do? waxed. natural. sensitive. new dove ultimate antiperspirant. our unique water based formula and 6x me glycerin. helps restore skin to itsbes. new dove ultimate. if your moderate to severe crohn's disease or ulcerative colitis symptoms are stopping you in your tracks... choose stelara® from the start... and move toward relief after the first dose... with injections every two months. stelara® may increase your risk of infections, some serious, and cancer. before treatment, get tested for tb. tell your doctor if you have an infection, flu-like symptoms, sores, new skin growths, have had cancer, or if you need a vaccine. pres, a rare, potentially fatal brain condition, may be possible. some serious allergic reactions and lung inflammation can occur. feel unstoppable. ask your doctor how lasting remission can start with stelara®. janssen can help you explore cost support options. with angi, you can connect with and see ratings and reviews. and when you book and pay throug you're covered by our happiness check out angi.com today. angi... and done. ♪ ♪ ♪ ♪ ♪ ♪ voltaren. the joy of movement. as a main street bank, pnc has helped over 7 million kids develop their passion for learning through our grow up great initiative. and now, we're providing billions of dollars for affordable home lending programs... as part of 88 billion to support underserved communities... including loans for small businesses in low and moderate income areas. so everyone has a chance to move forward financially. pnc bank: see how we can make a difference for you. 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