mariupol is in a disaster. food, water and ammunition growing more scarce by the hour. hundreds of women and children hiding inside a battered and burnt out fortress. no agreement on evacuation corridors out of mariupol because the ukrainians fear they will be attacked by russian forces. this morning disturbing satellite images as well show rows of mass graves near mariupol. russian soldiers dumped bodies into ditches to cover their crimes. the mayor of mariupol calling it evidence of war crimes. >> i spoke with the mary and he said these images are painful to see. a once blossoming city now reduced to rubble. he said more than 20,000 people, 20,000 people have been killed there. we will hear from him directly just ahead. meanwhile, president biden says the war is now entering what he called a critical window. he announced a new 800 million ukraine weapons package, the second one in just over a week. the new package focused on heavy artillery, howitzers and drones. president zelenskyy tells the world bank he will need $7 billion a month, a month, to make up for the economic losses here. those of course beyond the human losses in this country. in eastern ukraine, the russians are trying to advance overnight. heavy reporting in the donetsk and luhansk regions. evacuation attempts were halted. deliberate targeting of humanitarian corridors. and new intercepted audio, russian soldiers can be heard referring to an alleged order, an order to kill ukrainian prisoners of war. we will play that sound for you just ahead. just following orders. what does that remind you of? isa soares is here with me in lviv. isa, we see the evidence of what the russian military has been willing to do and has done in this country. you see the conditions of bodies after soldiers withdraw, gunshot wounds in the head. now we have the sound soldiers speaking specifically about the orders to do it. >> what we are seeing time and time again is the reality of what russian forces are doing across the country. and this is their modus operandi. the new imaging, if you remember, a second set of mass graves in two and a half weeks. remember bucha. the images are so hard to watch. we have four rows very clearly marked in the satellite images by maxar technologies that shows the vast nature of it. and you're looking at the top part of our screen right there. maxar technologies has compiled and analyzed all of these satellite images and say there are about 200 new graves. just to bring perspective for you, that long line is about 1,100 feet. and that's 20 times larger than what we saw in bucha. and i was doing some calculations before i came on air, and that is more than three times an american football field. it's just stager igering to comprehend what we are seeing. the mayor of mariupol believes about 20,000 people having been killed. listen to what he had to say, jim. >> legal definitions are very important. we claim all the world, we claim the united states and all other civilized country to recognize everything what is happening here as a genocide. because russians are killing ukrainians just because of ukrainian, without any other reason. >> so genocide in the 21st century. the importance, as you were pointing out, of really writing down the crimes, keeping on top of the crimes. it doesn't matter how small they are. but you hinted at the fact that expect more of this to come. what russians are doing, mopping up their crimes. >> important point there, right, the mass graves. but also accounts of burning the bodies. the crimes and then the efforts to cover up the crimes on a grand scale. isa soares, thanks so much. >> in a moment you will hear from the mayor of mariupol. he said people who are getting out say there is hell, and its name is mariupol. but he does have hope that ukraine will get the besieged city back. how and when, we don't know. thatter interest view just ahead. brianna. jim, new this morning, ukraine's military intelligence released purported communications of russian forces referring to an alleged order to kill ukrainian prisoners of war in the city of popas in the eastern region of luhansk. here it is. >> translator: what can i tell you, damn it. you keep the most senior among them and let the rest go forever. let them go forever, damn it, so that no one will ever see them again, including relatives. >> now, cnn has not been able to confirm the authenticity of the reporting. natasha bertrand and kylie atwood with us. kylie, this is bad. this recording is terrible what it is showing. >> reporter: yeah. incredibly awful words to hear here. and we are still waiting to hear from the biden administration, from the state department, to see if they have received these intercepts. we know the biden administration has been working with ukrainians to determine the authenticity of some of the reports that have been coming in to verify if what they are seeing, hearing and collecting is in actuality what it appears to be. in this situation, if these enter septembers were shared with the u.s. government, they would be given to the intelligence community for authenticity checks, for processing. that information would be shared with the state department. rest a sssured that would contribute to the war crimes determination that the united states has already made about what the ukrainians are doing in -- excuse me, about what russians are doing in ukraine. but this is incredible to listen to. we're still waiting to see exactly how the biden administration is going to respond. >> yeah. we are waiting. i wonder what questions this raises for you, natasha. >> yeah. investigating them for war crimes investigation is going to be key here. we have seen the ukrainian military release intercepts like this in the past. and the biden administration has not previously commented on them one way or the other saying we are not going to second-guess of course what the ukrainians have released. we are investigating everything as it comes in. this is going to be analyzed by the intelligence community. it's important to remember that it's very plausible these are real because of how the russian soldiers have been communicating largely on open lines here. they have not been operating on secure channels. it has been simple for the ukrainian intelligence community toer is september these conversations. it is important to remember they are killing civilians point-plank, which is what the united states have accused them of and what the videos and photos have shown, they would be reticent to show the war crimes >> can you tell us about the russian oligarchs. we know of the death of a second oligarch, and not only him but his family. >> it's very suspicious. the russians have a track record of carrying out assassinations. but there is no evidence at this point of course that the russian forces or the russian security services are involved. but two families connected to the russian gas industry have been murdered in recent days. the husband, the wife, and the children. there are of course really harsh sanctions right now on the russian economy. a lot of these gas industries, gas executives have lost a lot of money. so one of the theories is this could be a murder-suicide situation. but it raises questions given the russians' histories of carrying out attacks on european soil and making it kind of look like an accident can't be ignored either. >> i wonder, kylie, how u.s. officials are assessing this and how relations between vladimir putin and oligarchs in russia are going, if they have a sense of that? >> reporter: u.s. officials see striking similarities in these two instances. as natasha was saying, two separate incidents killed just days apart from one another. one was in spain. one was in moscow. these of course are being investigated. but the fact that these happened in tandem i think is a very key note to point out. and when you talk about president putin's relationship with russian oligarchs right now, it isn't altogether a steady relationship. we have seen some oligarchs who have defected from russia. a lot of oligarchs have come under pressure from the biden administration, the international community as they have faced incredible sanctions. they are not able to live the glamorous lives they were able to live before the ukraine war. that is creating some division, tension between president putin and those who have been very close to him, have propped him up throughout his entire presidency. but we should also note there are a tremendous number of oligarchs who haven't broken from putin. until those folks do, he has the support he needs to maintain the piggy banks he has all around the world through the oligarchs. >> certainly does. thank you so much for the reporting. i do appreciate it. >> up next, russia is trying to hide evidence of war crimes. that is from mariupol's mayor. what he said about the soepbls in the steel plant and his message to putin. plus, house leader 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city. >> vladimir putin is claiming victory in mariupol. president biden said there's no evidence that mariupol has completely fallen. which is it? >> translator: the truth is that the armed forces of ukraine are defending mariupol. mariupol is the beating heart of ukraine today. our guys are outnumbered 10, 15 times, but they are defending. they're holding up. and they are remaining there. and they are frustrating the enemy as much as possible. >> now, putin also said he scrapped plans to storm the azovstal steel plant. what will happen to all the people trapped there mao? >> translator: so, at the moment, we have people waiting for evacuation. we would like to evacuate the civilians that are sheltering in azovstal. we need one clear day of cease-fire to evacuate those people. however, we have not been able to so far. the day before yesterday, we planned to open up an evacuation route that these people could join. however, the russian forces that continued bombarding the plant and shelling the plant, and we weren't able to get the people out of there. >> is there any current effort by ukraine or other nations to get them out safely? >> translator: everybody is uniting around this goal of helping the people trapped there. yesterday we heard an appeal from u.s. president joe biden, who asked for everybody to do whatever is possible to save the people trapped in azovstal. >> new satellite images seem to show mass graves just outside mariupol. how many civilians do you believe have been killed in your city? >> translator: so, as of the 21st of march, our utility services and our municipal services registered officially 5,000 dead. that's as of 21st of march while we were still able to operate there. these people died from the many days oven my air bombardment and enemy shelling and 90% of the buildings in mariupol were destroyed. then after that, there was a lot of street fighting. people were dying in the streets. and he with still had -- we weren't able to register officially, but we still had some services working until the 24th of march. so according to our estimates, we have around 20,000 dead, civilian deaths in mariupol. and these were people who were buried by enemy shelling, by enemy bombardment, buried under the rubble. at the moment we are witnessing the enemy trying to hide the evidence of their crimes, using the instrument of mass graves. >> as the leader of this city, you knew many of these people. what is it like to see this happen? >> translator: it is very painful for me to see this. very painful and sad. because for eight years, we were trying to develop mariupol as a showcase for ukrainian donbas, restored donbas since the 2014 attempts to take it. and it was blossoming. it was turning into a modern city. we were developing it as a modern state-of-the-art city to fulfill people's dreams as we imagined. we had a strategy for the city development to make this a showcase. and i feel as if my heart has been torn out. my life, my family, we lived there. this hfs our life. and pore me and tens of thousands of residents, it is terribly painful to see so many dead and the city destroyed. >> the u.s. is sending another big weapons shipment to ukraine, $800 million, heavy artillery. tell us how this will help the fight and what's missing at this point? >> translator: well, the number one priority now is to help save the lives of civilians. but i also want to thank joe biden for helping us with the military assistance and thank all the partners. these weapons are very necessary. it will enable us to block mariupol and eventually free the region and the entire ukrainian territory of the enemy occupation. we want to thank everybody who is getting involved in helping us militarily. we will win because truth is on our side and god is on our side and we are on our own land. >> do you believe ukrainian forces can ever take mariupol back from russian forces? if so, how do they do it and when? >> translator: well, one thing that i would say that will help us get back to mariupol is a full oil and gas embargo on russia. those who buy these products must realize they are financing the enemy's war and the damage that the enemy is doing to our cities such as mariupol. they need to stop receiving this money. and once that happens, we believe that in two to three weeks, we will stop the enemy, and the enemy will be forced to retreat. and we will get back. we will counterattack and get our territory back. the front line will move. and at the moment i have full faith in our heroic defenders in mariupol today and are continuing to defend it. >> i feel as if my heart has been torn out. those are the words of the mary of mariupol with a harrowing eyewitness account from his city. coming up this hour. kropb on the front line in a town russia claimed it has captured as hell rains down on ukrainians. we go to the bombed-out theater are civilians are too scared to flee. >> plus, back in the u.s. -- >> mr. depp, you said i will [ bleep ] her burnt corpse afterwards to make sure she is dead. >> johnny depp confronted in court with graphic texts, angry outbursts with his ex-wife amber heard. what else we learned in the courtroom. what does the future of strength look like? it's dynamic weight that adjusts for you in real ti for a more effient workout. and you can only experience it... 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>> brianna, probably the most volatile day of the year so far. extreme fire conditions from denver to albuquerque. winds will be blowing at 70 miles per hour. all the ground is dry. the grasses haven't greened up yet. extreme conditions. we get two or three a year. and this is the worst i have seen this year. tornados and large hail east of there. to the north, a blizzard into parts of the dakotas. the south wind will blow up very warm air across the south and the southeast. not quite to new york city but certainly to d.c. this weekend. bree app that. all right. target audience there in d.c., you know. ukrainian firefighters working tirelessly since the war began rescuing people, putting out fierce. seeing these images from too much for one american firefighter. he started an effort to get equipment from people in the u.s. to ukraine. now he is there working toward that goal. he is with us now. he is a firefighter from san miguel, california. eric, thank you so much for being with us. tell us about where you've been working and the kind of work that you have been doing. >> we're predominantly working bucha aaron, eastern ukraine, eastern kyiv region that was under russian occupation the time that we have been here. >> so you have been working in -- i mean, ideally the goal is to work in rescue. i know you have been doing a lot of recovery as well of bodies but also possessions. can you tell us what you've been doing? >> predominantly at this point our effort is all recovery, to bring closure to families and finding ones that have been deceased. and in rescue efforts, we have been pulling out family photographs and valuable items that the families want to keep. on easter sunday when we were recovering a body, we found and recovered all the family photographs. >> that may be all they are able to keep. i know you have had some experience with boobytrapping. what are you seeing? >> in one of the areas we have been working in, kosmel, it was taken over by russian forces and used as a command post. they set ieds they set trip wires, anti-personnel mines, buried everywhere we have seen. one of the places we were working easter sunday we found a landmine close to where we were working. . >> the challenging conditions. i can't even imagine what you are dealing with. can you tell us why you decided you need to do this, eric? >> it all started back in the united states. we were sitting at our firestation watching the news. we saw the firefighters there on tv. they are trying to fight fires and rescue people. and you watch all the media. they were sending aid teams with doctors, nurses, medical supplies, even aid to the military with weapons but nothing was coming for the firefighters. they have been working tirelessly since this war started. i said we are going to provide aid to them and get them the resources they need directly. this morning we had our cargo of brand-new technical equipment, medical supplies that we'll be distributing today to 10 firestations. . >> amazing work you are doing. talk to us about what you are doing and what you are seeing. thank you. >> thank you. scientists say coronavirus antibodies come from both infection and vaccination, but that doesn't mean equal protection. we'll have dr. sanjay gupta joining us on that. it's 5:00 a.m., and i feel like i can do anything. we've been coming here, since 1868. there's a lot of cushy desk jobs out there, but this is my happy place. there are millions of ways to make the most of your land. learn more at deere.com do you think any of us will look back in our lives, and regret the things we didn't buy? (camera shutters) or the places we didn't go. ♪ ♪ welcome to allstate. where you can bundle home and auto insurance. right, frank? i saved 25%. booyah. and now you're relaxing! we're working from home. save up to 25% when you bundle home and auto with allstate. the grizzlies rallied from a 26-point deficit in an epic game three against the timberwolves. andy scholes has more in this morning's "bleacher report". that is something, andy. >> reporter: it will be hard to find a more wild game than this one last night. they rallied from being down 26 in the first quarter and 25 in the third to easily beat the timberwolves in game three. minnesota came out on fire and scored the first 12 points of the game. the crowd was all pumped up. they are up by as many as 26. grizzlies went on a run. they cut into a seven-point deficit at halftime. but then the timberwolves came out red-hot again in the second half and opened up a 25-point lead in the third quarter. but the grizzlies just showed incredible resolve. they outscored minnesota 37-12 in the fourth quarter. incredibly, they won game 3 easily, 104-95 to take a 2-1 lead in that series. the warriors continue to just put on a show in denver. steph curry coming off the bench again. 27 points, as did the warriors new star jordan poole. klay thompson had six threes, 26 points. and draymond green coming up with a huge steal from likely mvp jokic. brianna, they say it's not over until it's over. that warriors/nuggets series is over. 143-0 all time in the playoffs. >> unbelievable. andy, thank you so much. really appreciate it. the recent dropping of mask mandates has many people wondering just how well protected we are against the coronavirus. our best defense is our immunity from infection or from vaccination. but as cnn's dr. sanjay gupta explains, not all protection is the same. >> reporter: in this lab at emory university, scientists like this 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, all individuals will have high antibodies that wane over time. you will have individuals with very low and very high antibody responses. >> reporter: take a look at this graph from people with immunity from a prior infection. see how varied the blue lines and dots are. it is 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. but 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? >> aren't good core lats of protection. something that says this is the measurement one needs to know they are protected. now with these variants, we see how they take a hit. >> reporter: say someone essentially doesn't have antibodies anymore. does that mean they no longer have protection? . >> not necessarily. there are 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 is an intruder near your home, they turn on. why do we focus so much on antibodies in. >> one aspect is they are one of the easiest to measure. . >> the immunity you get has become way more politicized than anything i have ever seen in medicine. but it is still a very important medical question. >> reporter: dr. dorry segev, said antibody tests should be used 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. its is something segev thinks we 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 this sort of new social contract of covid. >> reporter: so, brianna, there's no question if you have been previously infected, that can provide immunity. the real issue has been how predictable is it. somebody who is older with a weakened immune system, they may not generate as much as someone who is younger who got very sick. it is hard top predict. if you have to get it through the infection rather than vaccination, infection can make you sick, leave long covid symptoms. that he wants the balance. that is the real balance back and forth. >> those graphs don't lie in the protection and how dependable one is over the other. sanjay, thank you so much for that. >> and "new day" continues right now. ♪ good morning to viewers here in the u.s. and around the