welcome to "world news tonight." breaking news. chaos on the strip. a gunman kills one then squares off against s.w.a.t. teams in las vegas. a section of the strip shut down. this just hours after the bellagio hotel is put on lockdown after armed burglars wearing masks attempt a major jewelry heist. also developing, brauwls breaking out at a pro-trump rally in california. this as the white house re-groups after the devastating health care defeat. vice president pence announcing the war on obamacare is not over. details on president trump's next move. night strike. the tornado. dangerous winds and hail hitting in the middle of the night. this church destroyed. deadly crash landing. imagine coming home to this. a plane's nosedive blasting a

quiet neighborhood. the fiery explosion and what may have saved the homeowners. and assassin in action. tonight, the chilling new surveillance video showing the apparent execution of one of vladimir putin's fierce critics. and good evening. thanks for joining us. i'm tom llamas, and we begin tonight with that breaking news. the terrifying moments unfolding in las vegas. chaos on the strip. as we come on the air, parts of the strip shut down tonight. tourists sent scrambling. all of it sparked by a deadly shooting on a bus. the suspect barricading himself surrounded by police. hours after this at the bellagio hotel, at least three masked gunmen trying to rob a luxury store. casino-goers running for their lives. abc's marci gonzalez is live on the strip with the details

coming in. >> reporter: a bustling las vegas strip is calming down, and police try to find out what prompted today's violence. >> we have one suspect down. >> reporter: tonight, a standoff on the las vegas strip. s.w.a.t. teams surrounding a gunman they say shot two people on a bus, killing one of them. tourists watching it all unfold. this just hours after another tense scene that triggered a lockdown at one of the trip's famed casinos. armed and disguised in animal masks -- >> possible masked shooter in a zebra mask. >> reporter: suspects seen in this video posted on youtube carried out a high end heist inside this jewelry store at the hotel. >> i noticed a person in a pig mask, and it noticed it looked like he was holding something long and black in one hand, and i notice he was holding what looked like a gun in the other hand. >> reporter: the thieves using sledgehammers to smash into the

rolex store just before 1:00 this morning. police say no one was hurt, but authorities wouldn't reveal how much the criminals managed to get away with before descri getting away in what police describe as a clumsy escape. >> they attempted to escape in a vehicle, and that failed to start. they tried to carjack people, and they fled on foot. >> reporter: police making one arrest saying they are on their way to tracking down the other suspects. >> we know one person was killed in the standoff student. what is the latest with it? >> reporter: the second victim suffered nonlife threatening injuries and we got an update. the suspect was taken into custody without incident, and they have no reason to believe, that the two incidents, the heist overnight and shooting today have any connection. >> that looks like a ghost oun. marci, thank you.

we want to turn now to the new pictures coming in from california. violence breaking out at a pro trump rally in huntington beach. punches thrown in various forms. all-out brawls. police say a march of about 2,000 trump supporters clashed with dozens of anti-trump forces. anti-trump protesters sparked with incident when they pepper sprayed marchers. the president re-grouping after failing to repeal and replace the affordable care act. the president and his team re-grouping after failing to replace the affordable care act as promised in his campaign. failing to galvanize the republican majority in the house. mike pence spoke to business owners today in west virginia, saying the victory of obamacare won't last long. abc's david wright at the white house tonight. >> reporter: with the gop health plan in tatters, president trump sought to reassure his supporters that all is not lost. tweeting, obamacare will explode, and we will all get together and piece together a great health care plan for the people. do not worry. vice president pence brought much the same message to coal

country. >> we will end the obamacare nightmare and give the american people the world class health care that they deserve. >> reporter: millions of voters who got coverage under obamacare are worried. >> it's not a perfect plan, but i'm grateful to have what i do have. >> reporter: a settlement shared even by trump supporters. abc news recently met mike taylor, a supporter for whom keeping obamacare was a life or death issue. >> what's worrying you? >> if they do away with this, the insurance, they need to -- i think, they need to reform it. >> reporter: today, he still supports trump, but he is thankful obamacare survives. >> i'm glad they voted the way they did. can't build a mansion overnight. maybe they will get together and resolve it to where it still helps. >> reporter: whether or not obamacare now explodes depends partly on trump according to

andy slavitt who helped president obama implement the affordable care act. >> it's completely within the power of the administration right now to decide how successful this law is, and if it fails, it's going to fail because they decided to let it fail. >> reporter: during the campaign, trump promised this would be easy. >> you are going to have such great health care at a tiny fraction of the cost, and it's going to be so easy. >> reporter: only to get a serious reality check once in office. >> health care is a very, very difficult subject. it's a very complex subject, and it's a subject that, you know, goes both ways. >> reporter: now the administration is cutting its losses and moving on to tax reform. >> working with this congress, president trump is going to pass the largest tax cut since the days of ronald reagan. >> promising tax reform, david joins us from the white house. the trump administration has had trouble with their travel ban, and now health care, and it looks like tax reform won't be

any easier. >> reporter: not at all. here's why. every special interest that currently enjoys a tax loophole and every interest that wants one, they will be lobbying their members of the congress, and that's why we haven't had tax reform in more than 30 years. >> david, thanks so much. much more on "this week" when george goes one-on-one with senate minority leader, chuck schumer and freedom caucus chair, mark meadows. next tot fiery crash landing in georgia. a small plane spiraling out of control, slamming down into a yard and erupting into flames, killing the pilot on board. why the family escaped injury, abc's eva pilgrim reports. >> reporter: tonight, the fiery plane crash under investigation. >> my house is on fire. >> reporter: a home engulfed in an inferno. >> plane crash! >> a plane just crashed. >> reporter: the atlanta suburb rocked by the explosion. >> we do have a column of smoke here.

>> reporter: the plane slamming into the lawn of this moment, killing the pilot. >> i looked back up and i saw the plane spiraling out of the control, and it started taking a nosedive and spiraling down. >> resulting from aircraft crash. >> reporter: the plane took off from cincinnati and according to air traffic control audio from the cockpit, there was a problem with the autopilot. >> we'll be looking at that and seeing if it was a factor. >> reporter: the family who lives here, thankfully not home. at church at the time of the crash, telling neighbors they were saved. >> by the grace of god. that's how he put it. >> reporter: there were roughly 135 small plane crashes a year. that's about ten a month. many due to losing control of the aircraft. tonight, ntsb investigators poring through the mangled wreckage of the crash site. as you can see, they are moving the plane as they continue to pinpoint exactly what happened, saying they will research both the pilot and the plane's histories, tom.

>> eva, thanks so much. now the severe weather pushing east. a tornado blew through arkansas, and winds damaging the church, stunning the faithful outside of louisiana. here's abc's phillip mena. >> reporter: tonight, destruction in the south. as a new threat takes aim at tornado alley. >> it was there. >> reporter: in greengold, louisiana, pastor martha griggs' church destroyed by extreme wind overnight. >> it brought me to tears. >> reporter: the roof and cinder block blown down. bibles scattered in the debris. >> i'm thankful there was no one in the building. no one got hurt. >> reporter: that same line of storms spawning an ef-2 tornado in arkansas. >> there was a frame there a mobile home that was blown off. >> reporter: the twister on the ground for less than a minute, but flipping this mobile home. the bottom gone, and this home's ceiling caved in. the night's storm making it dangerous for drivers in kansas. pelted by hail up to the size of golf balls.

tom, this church is a total loss, but sunday worship will go on. the pastor here telling us she will hold services at her home nearby until a new church can be built, tom. >> devastating. thanks so much. senior meteorologist rob marciano joins us with the forecast. we're talking about a possible tornado threat? >> reporter: a couple of rounds of them. storms are firing tonight, and not a lot of damage, but they are going on east of new orleans up through nashville. you will see the wide expanse, there you but we're in this amplified pattern, and the rockies gets into the plains and we have a higher threat for severe weather. oklahoma city, almost down to dallas, and tornadoes will be a risk there. dangerous situation into monday into the mississippi towns including memphis and greenville, and advance of this storm, spring temperatures across the east, and still shots of cold air in boston and d.c., so keep your coat handy. >> thanks so much.

now we're going to head overseas to the disturbing images emerging from ukraine. the undercover video showing the assassination of a vocal critic of russian president vladimir putin. it's the latest of a series of deadly incidents raising new questions tonight. abc's ron claiborne tracking this. >> reporter: in this newly released chilling video, the russian defector can be seen. that's denis voronenkov. his bodyguard on his left. watch as a man approaches from behind. steps up to voronenkov, and shoots him. the bodyguard charges the attacker. as the victim lay on the ground, his body can be seen firing at the fleeing assailant, fatally wounding him. but voronenkov was dead on the street in the ukrainian capitol, and officials there immediately blamed russia calling the murder an act of state terrorism. voronenkov, a member of the russian parliament, fled to ukraine while under investigation for corruption. he spoke out against putin. over the years, a number of putin critics have been

murdered. he had given several interviews saying his life was in danger. two years ago, boris nemtsov, a prominent politician, gunned down near the kremlin. and in 2006, alexander l lit v litvinenko was poisoned. his murderer was carrying a passport, but people say russia ordered the hit to silence him. a spokesman for putin says he hopes that an ukrainian investigator is able to solve the murder, and mr. putin invited the victim's widow to return to russia. >> we'll see if they accepts that invitation. thanks so much. now to the u.s. military tonight admitting it launched an air strike in iraq that killed scores of civilians. the u.s. saying iraqi security forces requested the air strike on isis targets in mosul on march 17th, and they

did not confirm casualty numbers, but health workers say at least 100 people were killed. we're learning more about the final moments of the man accused in the horrific attack in london. details coming out with ties to saudi arabia, and questions intensifying on whether he worked alone. abc's jennifer eccleston with the latest from our london bureau. >> reporter: new video of the attacker moments after his deadly rampage. police rush to the policeman fatally stabbed. the killer already shot down, surrounded. the gates into britain's parliament open, unguarded. this image shows that policeman posing for a photograph with an american tourist moments before that horrific scene. tonight, investigators are racing to unravel khalid masood's past. saudi arabia confirming masood was in their country three times since 2005. stressing he was not on a terror or criminal watch list.

also tonight, that key question. did he act alone? british media reporting the 52-year-old used the whatsapp messaging service two minutes before the terror unfolded. just who was he communicating with? not known. the british muslim convert was born adrian russell ajao. spending time in prison for assault and investigated for links with extremists more than a decade ago. he was determined low risk. ten men have been arrested and released since the rampage, and police will be searching computer files seized for any indication that the perpetrator received support, encouragement or directions to carry out the attack. >> jennifer, thank you. there is much more on "world news tonight" this saturday. the crash of the self-driving uber. who was at fault? man or machine?

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accident is investigated. and the arrest of a man police think is the elusive incognito bandit. hitting 16 banks in the boston area over two years. the fbi tracking him down to an airport, nbaing him before he could get on a flight to south afri africa. you have to see this. this cow ran into a fenced in area, and the cow didn't like that. turned around and started charging at the officer. now this brave officer took off running. that cow still on the loose. a human @rescue of a shark in florida. the lemon shark swimming up to the diver, and it had a hook in its stuomach. the shark kept coming back. the diver thinks it was thanking him. when we come back, the little boy coming all the way from kosovo.

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finally tonight, a little boy from kosovo in new york for surgery. in addition to his doctors, his family thanking a group of american high schoolers. >> reporter: with that smile, that energy and that laugh, it's hard not to like 6-year-old erblin. this little guy is happy because he is learning first hand the generosity of americans. he was born with a life-threatening congenital heart defect. he needed heart surgery. his father ran out of options. >> i was terrified and scared, while i was in kosovo that he will die. >> reporter: but a group of high school students from long island heard about erblin's problem,

got together with a program called gift of life, and they raised thousands of dollars to fly him over to fix his heart. >> before the surgery, we were able to meet him and he was so adorable. >> reporter: but these students didn't just raise money. they sat in on the surgery. all of them with dream of being a doctor just like the surgeon who patched him up. it was only a 35-minute procedure, but it was life-changing. >> i was tired. now i feel good. >> reporter: and so do those students. not doctors yet, but already saving one life. >> this is, like, truly a day i will never, ever forget. >> reporter: he now heads back to kosovo. his heart feels better, but not as good as his stomach because this was his favorite part about america. >> i like the food. [ laughter ] >> spoken like a true 6-year-old. "gma" and "this week" in the morning. i'll see you right back here tomorrow night. good night.

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get the best. go to getfios.com >> i'm erin o'hearn. >> and i'm karen rogers. tonight on fyi philly. >> friday, saturday, sunday >> we try some new center city dining. >> very vip. >> take you to a modern member's only social club. >> this is what we do. >> round up some favorite brunch spots. >> yum. >> taste gourmet marshmallows and ice cream sandwiches. >> show you the latest in spring fashion! >> this is a work of art >> and give our regards to broadway philadelphia. >> hamilton! >> hi everyone and welcome to fyi philly! we are at the james here in logan square. >> named after james logan who was the 14th mayor of philadelphia. >> it's right across from the new comcast technology tower and there are new residential spaces popping up just around the corner. >> it's one of two new spots we found that are bringing an upscale bar scene to their respective neighborhoods. >> walk into james and you're greeted by a 50-foot bar that runs t