stay with us for "good morning america." making news in america this morning -- another explosion. in austin, texas, after a string of deadly package bombs left outside homes. >> i've been here my whole life. and -- i think i'm just in a state of shock and disbelief right now. >> neighbors ordered to stay indoors, as police work overnight to clear the scene. the city on edge with a potential serial bomber on the loose. what's different about this explosion? president trump steps up his attack on robert mueller's russia investigation. prompting a new statement from the white house this morning. this, as facebook responds to a bomb shell report that political clients exploited the data of 50 million facebook users.

a star acrobat fell to his death in front of fans of cirque du soleil. millions of dollars in missing gold. is it here in pennsylvania? plus more bracket-busting results in the march madness tournament. and the chick-fil-a worker who went above and beyond after a customer forgot something at the drive through. a good monday morning. to you all. we begin with breaking news. parts of austin, texas, are on lockdown after the city's fourth bombing in 17 days. >> the latest explosion came in the southwest section of the city, leaving two men injured. it came just six days after a package bomb killed a teenager. the previous explosions involved packages rigged with improvised explosive devices. in this case, police where are investigating where the device was triggered by a trip wire. a witness says the wire was tied

between two real estate signs. police are urgently combing the area to make sure there are no other devices. residents within half mile radius are being told to stay indoors. >> we're asking you to stay in your residence until we have had the opportunity to ensure this neighborhood is safe. if you have an emergency, call 911, give us the address so we can come in and safely escort you out. >> i don't know if it was malicious on or just an accident. i'm scared it's related to what's been happening. >> if we're all more aware, hopefully, we will catch them. we're going to stress it more to our child, too. anything you see out of the ordinary, just instantly report it. >> that entire city of 2 million people on edge this morning. two men injured in last night's explosion are in good condition. so far, police have not linked this bombing to the three earlier explosions that left two people dead. the victims in those cases were people of color. the reward has been raised to $115,000.

now to the other big story. that we're following overnight. president trump ramping up his attack on special counsel robert mueller's russia investigation. >> the president fired off a series of tweets this morning. now a white house lawyer is trying to clarify. arlette saenz has more. arlette, good morning. >> reporter: diane and kendis, good morning. president trump spent the weekend out of the public eye but fuming over twitter. his latest attacks on the russia investigation are entering new territory. he's steering his fury in a new direction. his latest target, special counsel robert mueller. calling him out for the first time by name. the president tweeted the mueller probe should never have been started. in that there was no collusion and there was no crime. witch hunt. the fresh attack came after his personal lawyer called for the justice department to end the special counsel's probe. lawmakers on both sides of the

aisle are issuing a warning, don't fire mueller. >> if he tried to do that, that would be the beginning of the end of his presidency. we're a rule of law nation. >> this would end in a constitutional crisis. and i think democrats and republicans need to speak out about this right now. >> reporter: a white house lawyer tried to ease concerns. the white house yet again confirms that the president is not considering or discussing the firing of the special counsel. on fox news, one republican urged the president to exercise restraint. >> if you have done nothing wrong, you should want the investigation to be as fulsome and thorough as possible. >> reporter: the president took aim at deputy fbi director andrew pk kab, who was fired on friday, days before his retirement. mccabe denies any wrongdoing. but the president tweeted his ouster was a great day for democracy. sources tell abc news mccabe was interviewed by mueller's team and gave investigators personal memos of his interactions with the president. similar to memos written by his boss and former fbi director

james comey. the president tweeted he spent very little time with mccabe and never saw him taking any notes. he's calling the documents by mccabe and comey quote fake memos. kendis and diane? >> all right, arlette saenz, live from d.c. for us. thank you. president trump is set to roll out his plan to fight the opioid crisis today. it calls for the death penalty for drug traffickers. it calls for mandatory minimum penalties for dealers who distribute certain illegal opioids. he'll unveil more details today in new hampshire, a state hard hit by the opioid crisis. facebook is under more scrutiny this morning as we learn more about information about how a political consulting firm was able to collect the personal data of 50 million facebook users without their knowledge. that firm went on to work for the trump campaign. the man who blew the whistle on the data grab is now speaking to

abc news. our molly hunter is joining us from london with this story. good morning, molly. >> reporter: kendis, diane, good morning. that's right. this story is causing outrage on both sides of the atlantic, british and american politicians are threatening to haul in mark zuckerberg to testify and explain how this happened. a data company tied to president trump's 2016 campaign is under investigation by facebook, accused of mishandling millions of americans' personal information. >> if you're looking at trying to create information weapons, the battle space you operate in is social media. that is where the fight happens. >> reporter: in 2014, chris wylie worked for cambridge analytica. the organization helps political candidates better target voters online. speaking for the first time on american tv since blowing the whistle, he claims cambridge analytica, using a third party, took data from the facebook accounts of up to 50 million americans. cambridge analytica would create

online quizzes. when facebook users filled out the tests, they were giving the firm access to their data and the data of their friends as well. >> when you like things, you reveal all these little clues. if we have enough of those clues, we can start to develop a portrait of who you are. >> reporter: armed with that info, wylie says they had a questionable power. >> cambridge analytica will pick at whatever weakness of vulnerability we think you have. >> reporter: the firm went on to work for the trump campaign. which denies using their data. wylie says some of the familiar phrases heard on the campaign trail were tested years earlier by the firm. >> we tested things like drain the swamp. a lot of the narratives of the alt right, we started testing before really they gained prominence in american political discourse. >> reporter: now, chris wylie says he's coming out now because

he feels bad about the impact after the 2016 election. facebook has now banned him, that third paert, and cambridge analytica. the firm denied any wrong doing. kendis and diane? >> molly hunter, thank you. >> and one more note from overseas. vladimir putin has crushed the competition, easily winning re-election. as president of russia. putin joined cheering fans who braved the minus 10-degree weather. thanking them for their support. the election results are expected to be validated despite this widespread stuffing of ballot boxes caught on camera across the country. back in this country, time for a look at your weather this monday morning. ♪ a storm front stretching from north dakota to florida is on the move at this hour. pushing severe weather into the tennessee valley.

nashville could see the worst of it this afternoon. by tomorrow night, that storm could develop into a nor'easter, dumping up to eight inches of snow in the mid-atlantic area. today's temperatures will be almost summer-like in the south, warming up to 84 in new orleans. but in the northern half of the country, it's still very much winter. spring starts tomorrow. ♪ coming up, the $457 million powerball mystery. and also ahead, the war of the dating apps. the new legal battle in the search for love online. but first, a new revelation overnight about the florida school shooting suspect and what officers at his school were concerned about back in 2016.

and there it goes. all it took was about 300 pounds of dynamite to bring down this old building in ft. worth, texas. >> very effective. >> implosion took ten seconds, turning the 12-story building into rubble. it appears there was yet another missed warning sign about the florida school shooting suspect. court documents reveal school officials tried to have the alleged shooter committed in 2016 for a psychiatric evaluation. he had allegedly indicated he wanted to harm others and himself. and he even admitted to drinking gasoline. if he had been committed, he likely would not have been able to buy a firearm legally. one of the people making the recommendation was the sheriff's deputy accused of doing nothing when that shooting happened at stoneman dough last high school. an unsung hero from 9/11 has passed away from cancer at the young age of 45. firefighter thomas phelan evacuated hundreds of people

from lower manhattan while working as a ferry captain. officials say his cancer results from the fumes around ground zero. the mayor tweeted overnight -- in our city's darkest hour, firefighter thomas phelan's heroism saved countless lives. we'll never forget his service and sacrifice. the international search for a missing pennsylvania teenager is over. 16-year-old amy yu, who allegedly ran away with 45-year-old kevin esterly were found in mexico. esterly who is married father of four is in custody. he is awaiting extradition to pennsylvania. there's a new legal battle in the online dating world. the parent company of tinder and match.com is suing bumble. the lawsuit is claiming patent infringement, saying the co-creators of bumble are former tinder employees who set up a virtually identical service. just last november, bumble reportedly turned down a

takeover offer from match. someone who bought a powerball ticket in pennsylvania is several hundreds of millions of dollars richer. there was one winning ticket for saturday's $457 million jackpot. but powerball has not yet released the exact location of where that the ticket was sold. the cash value is $273.9 million. the eighth largest prize in powerball history. when we come back, the craziest moments so far in the march madness tournament. but first, the research that stephen hawking submitted days before his death about the end of the universe. and new details on the tragedy at cirque du soleil, as a star performer falls to his death. cirque du soleil, as a star performer falls to his death.

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witnesses say he appeared to simply lose his grip. >> yeah, the whole thing happened as the audience watched. abc's daria albinger has more. >> reporter: acrobats swing overhead in tampa, florida. at a cirque du soleil performance. then, horror. >> they had a performer that fell from an unknown height. >> reporter: one of the acrobats plunging 20 feet. >> we -- we experienced him literally fall in front of us. >> that was the shocker point for everyone, i think. >> reporter: cell phone video capturing the moments after the fall. >> we wanted the guy to get up. he was unresponsive. >> reporter: the tragedy happening saturday night. 38-year-old yann arnaud was taken to the hospital. a veteran aerial strap artist. on his instagram page, he posted video of his solo act. he'd been a cirque du soleil performer for 15 years.

the company released a statement saying the entire cirque du soleil family is in shock and devastated by this tragedy. the circus canceled the remaining two performances in tampa. police are investigating. daria albinger, abc news, new york. >> this is not the first deadly fall. during circumstance cirque du soleil shows. a performer was killed in 2013 after falling about 50 feet at a show in las vegas. students at florida international university return to school today for first classes since the tragic bridge collapse. a memorial at the bridge is growing. it includes six crosses, honoring the six people killed when the span collapsed. the final victim, brandon brownfield, was identified sunday. today, the university community and the public are being asked to pause at 1 dln 47 p.m. to mark the moment the bridge came down. for now, the street will remain closed. stephen hawking left us one more thing to think about before

his death. the end of the world. he submitted a research paper that was approved just ten days before he died. it predicts how the universe will fade into blackness as stars run out of energy. his paper gave a road map on how scientists can try to find another universe. switch gears to sports. a long weekend of march madness coming to an end just after midnight eastern time. >> that's right. now the sweet 16 is set. florida state is still dancing after knocking off number one seed xavier. the seminoles rallied to advance to the first sweet 16 since 2011. florida state plays gonzaga next on thursday. the cinderella story of the university of maryland baltimore county is over. the retrievers hung in there last night against kansas state. but eventually lost by seven points. the wildcats will face the other wildcats from kentucky. on thursday. >> and finally, a stunning comeback. nevada overcame a 22-point

deficit to beat number two seed cincinnati. that tied for the second biggest comeback in tournament history. nevada had the lead only once, at the end of the game. they play loyola chicago next. they were 22 points down with just 12 minutes to go and they pulled ate off. >> just an unbelievable weekend indeed. up next in "the pulse." a new milestone for "black panther." and real-life treasure hunt. missing gold from the civil war. what is going on there now? and the world watches as eagles hatch in the nation's capital. >> yes. copd makes it hard to breathe. so to breathe better, i go with anoro. ♪go your own way copd tries to say, "go this way." i say, "i'll go my own way" with anoro. ♪go your own way once-daily anoro contains two medicines called bronchodilators, that work together to significantly improve lung function all day and all night.

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for five consecutive weeks. it made about $4 million more this weekend than the reboot of "tomb raider." >> it has $1.1 billion banked worldwide and counting. not too bad. a mystery 155 years in the making. it takes us back to the civil war. >> legend has it that a shipment of union gold was lost in pennsylvania around the time of gettysburg. treasure hunters say it's buried in dent's run, pen, about 130 miles northeast of pittsburgh. >> the fbi is on the case. agents have been at the scene. they're not saying why. it's believed the gold could be worth $55 million. they're expecting to learn more from authorities some time this week. >> the group that claimed to find the gold said the feds didn't allow them to dig it up. now nobody's talking. we're getting interested. plenty of speed on show in the track and field masters indoor championships. first, check out the woman in lane 2.

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good morning. it's 4:27 on monday, march 19th. this is the official week of spring, right? >> the last day of winter. >> astronomically, yes. >> we have a beautiful day ahead. >> the rest of the week -- remember how we talked about that last week. how monday morning commute would be dry and we were looking forward to that. there it is. live doppler 7. it is crdry. but things will get wet again tomorrow. upper 30s in the inland 39 at half moon bay. your planner coming up. part of the commute is due

to the ideal traveling conditions. here's a look at the san mateo bridge. the westbound 92. not a lot of folks moving yet this morning. a quick check of light drive times across some of our other bridges here. golden gate bridge, six minutes from the north bay. westbound 80 across the bay bridge. 12 across the san mateo bridge. we'll look at more in a couple of minutes. from the live desk, i am tracking another bombing in austin, texas. this one may have been triggered by a trip wire. police are now asking people in one neighborhood to stay inside their homes until daylight while officials search that area. they've been doing that throughout the night. an explosion injured two people last night and they are expected to survive. this is a fourth blast within the past month. police have not said if the latest incident is a package bomb like the previous ones. but they're warning people to stay away from anything that looks like a package in the dark. >> it's important for anyone in

the neighborhood behind us to remain inside and give us time to work through this. we do have a second item in th area, a backpack that we're clearing to ensure that it is safe. it is a very active scene. >> so like i said, there is still a lockdown until the sun comes up. i'll be tracking the story throughout the morning. the reward for any information leading to an arrest right now has increased up to $115,000. back to you. jessica, thank you. 4:29 now. happening tonight, a celebration of life for three women killed at a veterans facility in yountville. jennifer golick was a therapist, wife and mother to a 7-year-old daughter. jennifer christine life to helping veterans heal.

they were shot by veteran wong before he took his own life. we will have live coverage of the memorial at 6:00 p.m. right here on abc 7. it is 4:30. if you're just waking up to us. hello there. quick update on the weather and traffic. we start with mike nicco. >> thanks, reggie. we'll start with the 12-hour planner today. we're going to see stars up until about 6:45 when the sun takes over the skies. temperatures in the mid-30s to 40s. maybe a degree or two warmer than yesterday. i don't think we'll see the frost that we saw yesterday inland. look at these temperatures by noon. no umbrella needed. in the upper 50s. a touch of spring as we hit the mid and upper 60s. we'll round it out with increasing high clouds. still a comfortable evening. here's alexis. >> so far so good, mike. mass