lawyer on the line as you're being pulled over. >> announcer: this is "nbc nightly news" with lester holt good evening, everyone bloodied and humiliated by a smaller but more nimble ukrainian military, russia appears to be adjusting its aims tonight. a new commander with a reputation for ruthlessness now in charge known to some as the butcher of syria amid gathering signs the eastern donbas region may be next to suffer under a brutal russian offensive word of russian troops massing for attack has sent a crush of civilians evacuating the region before they suffer the fates of places like mariupol where ukraine's president believes tens of thousands may have died, though there is no way to verify. president zelenskyy pleading for even more firepower from the west, and warning his citizens of an impending new push by the invaders as each day brings more evidence of civilians being systemically targeted. our gabe gutierrez is in ukraine with the very latest >> reporter: this body camera video shows a fire fight in the besieged southeastern city of mariupol where ukraine's president zelenskyy now says it's likely tens of thousands of people are dead, though tha number cannot be verified. after its defeat around kyiv, russia is now shifting its assault east tonight, u.s. officials say they have seen efforts by the russian military to resupply and reinforce their troops in the eastern donbas region. the country's largest city in the east, kharkiv, is seeing more deadly airstrikes as satellite images show an ominous eight-mile-long russian military convoy on the move near kharkiv, president zelenskyy over the weekend hosted british prime minister boris johnson defiantly strolled through kyiv. while zelenskyy told cbs that president biden and the u.s. are still not providing ukraine with enough weapons to win. >> translator: whether we will be able to survive depends on this unfortunately, i don't have the confidence that we will be receiving everything we need >> reporter: in the suburbs of kyiv, after russian forces retreated, a clearer picture of the destruction is emerging. the death toll is rising, now topping 400. here in bucha a painstaking recovery is underway forensic investigators are still exhuming the bodies from this mass grave, and war crimes prosecutors are on the scene today, sasha came to pay respects to his good friend who was buried here. he also tells us his father-in-law died of hunger i want the world to know that this is genocide, he says. among those rounded up by russian troops was dmitry, an advisor to the city council here he says his hands were tied behind his back and he was held at gunpoint. you were held here he was told if he tried to escape russian snipers would shoot him. he did it anyway when he thought the troops weren't looking during the harrowing russian occupation he says he personally knows at least ten people who were killed. it's very difficult to understand how these things could be happening in the 21st century, he says how could they shoot a man who was trying to escape with his family tonight in bucha there are many such questions but few answers. >> gabe, the scale and horror of all this continues to reveal itself and we understand president zelenskyy is warning his people of a dangerous new chapter >> reporter: yes, he says that the russians are sending a colossal amount of equipment east also, the russians have appointed a new ground commander known as the butcher of syria. he led russian forces there where civilians were targeted and cities were reduced to rubble, lester. >> all right gabe, thank you. meantime, the u.n. is investigating reports of sexual violence by russian forces in bucha and in other cities across ukraine. under international law rape and sexual assault are considered war crimes molly hunter now with a harrowing account from one woman accusing a russian soldier of rape >> reporter: 28-year-old olena and her husband sasha were living here when the war started. in early march looking for water she was captured by russian troops, she says, held hostage in a one-room apartment for two days it was about to get worse. starting the moment she was hit by a piece of burning metal shrapnel, that's olena's day one. >> reporter: can you describe the wound? >> reporter: she was in so much pain that on day two by olena's timeline she went looking for first-aid. russian soldiers occupying her town said they could help. >> reporter: olena is thin with a slight build we are not showing her full face she and her husband were very poor before the war broke out. they have a 7-year-old daughte they tell me she is with relatives. on olena's day three russian soldiers offering medical aid again changed her bandages, she says now we're at day four. what happens day four? she tells us three different soldiers came to their house dressed in civilian clothes saying they were there to help she has no idea how they knew she was wounded. one of them, a russian speaker, said he could take a look at her wound, she says, taking her upstairs so she went back downstairs. medics tell us her husband had at least one broken rib and the following morning on day five the soldier who had been upstairs with olena returned >> reporter: she made a run for it arriving home in tears. afraid the russian soldiers might return they fled to this area of bucha, which is where we met them are you angry? have you even had time to process? >> reporter: molly hunter, nbc news, kyiv. >> a hard story to hear but an important one to hear. new concern tonight as covid cases climb again. it's happening around the country including these six states with the biggest increases in the last two weeks. and triggering a return to a mask mandate today in philadelphia here's miguel almaguer >> reporter: tonight is the face of the pandemic continues to evolve for the city of philadelphia its future will soon look more like its past citing a more than 50% climb in new covid cases and fearing the start of a new wave, effective next week masks will once again be required indoors. >> i sincerely wish we didn't have to do this again. i wish this pandemic was over just as much as any of you. >> reporter: becoming the first but likely not the last big city to reimpose mask mandates today columbia university joined georgetown and others also requiring masks again in the classroom. omicron's highly contagious subvariant ba.2 is fueling the spike in cases and hospitalizations in some pockets of the country for now the northeast home to the most significant spread. and while cases are on the rise in more than half the country, infections are up less than 6% nationwide >> i am not overly concerned right now. we saw this in europe a few weeks ago. but the good news is we are coming off of so very low infection numbers. >> reporter: with americans basking in the rollback of restrictions, the cdc will soon decide if masks are still needed on airplanes it comes as families prepare to travel and gather for passover and easter >> each individual is going to have to make their calculation of the amount of risk that they want to take in going to indoor dinners and going to functions. >> reporter: tonight the w.h.o. is monitoring two new omicron subvariants. meantime, at least 30 million americans remain eligible for that second booster shot. lester >> all right miguel, thank you. starting tonight another round of severe weather. the fourth in as many weeks is expected to hit some of the same areas pounded by those previous storms dylan dreyer is tracking it for us what are we looking at >> once again those severe storms will impact the middle of the country. we have tornado watches in effect until 11:00 central time. also those red squares indicate the tornado warnings that are currently in effect. now, as we go through the night we will see especially down through arkansas the threat of hail in excess of three inches in diameter, winds gusting over 70 miles per hour, and the risk of tornados. tomorrow notice it doesn't shift that far to the east we are still looking at severe storms with hail, tornados, and damaging wind gusts and then again on wednesday the same general area, including once again arkansas, but this time stretching up into st. louis, indianapolis, even chicago could have that risk of severe storms and since all this activity is happening in the same area we could see the risk of flooding especially across western tennessee. also want to point out the snowstorm that is bringing blizzard-like conditions to parts of the northwest we could see 18 to 24 inches lester, in portland, oregon, they have never seen measurable snow in april. they already have an inch of snow on the ground. >> got a lot on that map tonight. >> oh yeah >> thank you. just in this evening the verdict in the second january 6th case to go to trial. thomas robertson who was an off duty virginia police officer when he stormed the capitol was found guilty on all six counts by a federal jury. among the prosecution's witnesses was a fellow officer who entered the capitol alongside robertson. a sentencing hearing has not yet been scheduled. facing rising crime, president biden announced new restrictions today on those so-called ghost guns that are hard to trace. kelly o'donnell is at the white house with that story. >> reporter: just blocks from her new york city high school, 16-year-old honor student angellyh yambo did not make it home friday after gunshots rang out. her mother's grief is agonizing. >> i lost my life. i lost my daughter i have no words to say or even express to you what i'm feeling now. >> reporter: police say a teenage suspect killed angellyh and wounded two others with a kind of weapon known as a ghost gun. last year about 20,000 suspected ghost guns were recovered from criminal investigations. a tenfold increase since 2016. today president biden put on display the kind of kit used to assemble a ghost gun as he announced new federal actions to ban the manufacture of unlicensed gun kits and require federally licensed gun dealers add serial numbers to existing weapons in stock. >> illegal for a licensed gun dealer to sell them without a background check. >> reporter: president biden is under pressure with crime on the rise many major cities across america have reported a grim record from portland to philadelphia, austin to albuquerque, toledo to tucson each of them set all-time highs for murder last year tonight angellyh's family wants action. >> please, we need to change we need to change the way this is going. because it is not changing for the better >> reporter: gun rights advocates say they will challenge the new rules in court. the president used his executive authority today because gun safety reforms cannot get passed through congress lester? >> kelly, thank you. in 60 seconds we will take you inside the new app aimed at reducing tension during traffic stops with police by getting a lawyer on the line immediately in brooklyn center, minnesota, a candlelight vigil being held tonight for daunte wright, the young black man shot and killed by a police officer during a traffic stop one year ago today. since then a new tool has been launched to de-escalate these encounters here's shaquille brewster. >> reporter: a local attorney available on demand and around the clock. >> are you being pulled over now or what's your status? >> reporter: through turnsignl, an app that connects subscribers in real time with lawyers who offer legal advice in a demo, they showed us how it works. with a click of a button or voice command the program records interactions during traffic stops or car accidents. >> where did that video go >> the video saves to your own personal cloud and only the driver has access to it. >> reporter: in response to george floyd's murder, three twin city natives built the technology launching it after the death of daunte wright, killed during a minnesota traffic stop a year ago today. a third party trains all available attorneys in de-escalation. >> we have seen the tragic deaths that have occurred during roadside incidents with law enforcement and what we know is we can put someone in that vehicle to de-escalate that interaction. >> reporter: a recent study showed black drivers are nearly 20% more likely to be stopped than white drivers. >> so we built this app for people that look like jazz, andre, and myself. >> reporter: as black men. >> black men we think about parents of young teenage drivers that don't necessarily know what the dos and don'ts are of being behind the wheel of a vehicle. >> reporter: turnsignl is now available in three states. >> we received calls on the platform almost daily at this point. >> reporter: is this app about policing the police? >> no, we are not a police monitoring app we are here to protect the interactions. >> reporter: minnesota's largest police association declined to comment but turnsignl's founders say they consulted with law enforcement to build the app, including st. cloud's police chief william blair anderson >> my initial reticence was because it has the potential to divide our attention and so i have come around to the viewpoint that so long as whoever is on the other end of that phone isn't escalating, we have to give it the old college try. >> reporter: using technology to bridge the gap between drivers and law enforcement. shaquille brewster, nbc news, minneapolis. here in new york a hate crime guilty plea by the california woman who wrongly accused a black teenager of taking her phone in a manhattan hotel, then grabbed him as he tried to leave in a plea deal miya ponsetat pleaded guilty to a charge of unlawful imprisonment in the december 2020 attack. up next, alarm over russia allegedly jamming american gps signals that ukraine's military uses our exclusive report ahead (music throughout) back now with an nbc news exclusive a top general accusing russia of jamming the gps signal u.s. satellites provide to ukraine. tom costello at the pentagon >> reporter: from drones in the skies to targeted missile launches on the ground, the war in ukraine is heavily dependent on technology. a four-star general at the pentagon says russia is interfering with the u.s. provided gps signals in ukraine. ukraine is unable to access gps because it's being jammed on the ground >> that's right. ukrainians may not be able to use gps because there are jammers around that prevent them from receiving and using the signal effectively >> reporter: while russia and china have their own gps satellites, most of the world relies on the gps provided by the u.s. for free. it's up to the u.s. space force, the newest branch of the military, to watch over the orbiting gps satellites from this command center in colorado. >> each satellite actually broadcasts multiple signals so the civilians get their signal. the military gets their signal. >> reporter: interestingly, the russians and the chinese can use our gps satellites, as well? >> i bet you they do. >> reporter: and gps has become a vital every day tool, from suburban drivers to international shipping to farming to banking to disaster response to those ukrainian military units meanwhile, russia has also reportedly jammed the gps systems used by civilian aircraft along its borders with finland. so far u.s. commanders say russia has not attacked u.s. gps satellites in orbit, though it did test-fire a weapon destroying one of its own satellites. >> they were also making a very clear statement to us about their intention to threaten our capabilities. >> reporter: saber-rattling in space and on the ground. tom costello, nbc news, the pentagon. and up next for us tonight, a trailblazing 20th century architect and how others are now building on his legacy finally tonight, the visionary who designed homes for hollywood's biggest stars now he is inspiring the next generation building the future. here is morgan radford. >> reporter: his work is instantly recognizable this is his handwriting on the sign of the beverly hills hotel? >> yeah. >> reporter: but for many his name is still unknown. paul r. williams, california's first accredited black architect. >> he is one of the greatest architects that america has produced. >> reporter: born in los angeles in 1894, williams became the most influential black architect of the 20th century. designing the homes of america's biggest celebrities, from frank sinatra to lucille ball. >> he was interested in social impact. >> reporter: often in neighborhoods where he wasn't allowed to own property himself. today just 2% of american architects are black why do you think that is is it barriers to entry, lack of exposure >> we need to prioritize diversity. who can be in the room to make those power judgments about what gets built, where it gets built. we need to be at the table >> this is another important area >> reporter: which is why the university of southern california launched a brand-new program for high-schoolers how many of you, by a show of hands, had ever met a black architect? nobody where they spend three hours a day completing their own design projects >> and you make buildings on laptops and stuff, what i never thought was possible. >> reporter: you are designing them yourself? >> yes. >> reporter: how does it feel to know that there are people who look like you and come from a similar experience designing the buildings you are in every day >> that it can be me one day designing a school building or an office building. >> reporter: a legacy generations in the making. morgan radford, nbc news, los angeles. and that's "nightly news" for this monday. thank you for watching, everyone i'm lester holt. please take care of yourself and each other good night - through the darkness, artists create light. they illuminate a path to health and well-being for all of us. and now, their light is shining on our stage, the blue shield of california theater at ybca, where artists and audiences create community together. - come join us inside. i'm raj mathai. next on nbc bay area news tonight, a lot of wind causing a lot of problems. jeff's going to break down when's behind all these gusts and exactly how long it's going to last. also that five-alarm fire over the weekend, intense, this is at that home depot in san jose. we're learning new information about how the evacuation went down and how homes in the area were saved. >> i couldn't even scream for help because my throat was so burned. >> we're live on the scene. what we're uncovering about this investigation. and putting the masks back on. we saw philadelphia reinstating its mask mandate. could we be doing the same thing here in the bay area? and this is cool, rate-season snow in the

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