As a tropical threat moves in. Crazy close encounters. The new video, a shark spotted swimming with these surfers in florida. These sharks closing a beach in cape cod. Go on. And the woman jogging on vacation when this bear charges. No. How she managed to scare it off. Mock guac. As avocado prices double, the new report. Are you being duped by your favorite dip . Fireball and pitbull is firing up your morning, performing his biggest hits live in central park. You ready for me . And the celebrity cameo you have to see right here on gma. Fireball and good morning, america. Hope you guys are well this friday morning. Lets look at the crowd in central park right now. Look at that. 7 01, 2,000 people already there for pitbull. They are ready to party, and they are packing in to see mr. Worldwide. Hes playing some of his biggest hits, and wait until you see his new music video in pop news. Really . Its always a lot of fun when hes here. Were looking forward to that. But we begin with those new developments overnight in the Kennedy Family tragedy. The 22yearold granddaughter of ethel and the late Robert Kennedy found dead at the family compound in haiyigh an is port, massachusetts from a suspected drug overdose. Whit johnson is leading us off with this. Good morning, whit. Reporter cecilia, good morning to you. Its another sad chapter in the Kennedy Family legacy. Saoirse kennedy hill was beginning her life, a senior at boston college. Her family now remembering her passion for philanthropy and generous spirit. This morning, authorities are investigating a Kennedy Family tragedy. 22yearold Saoirse Kennedy hill, the granddaughter of robert f. Kennedy, passing away after being rushed to the hospital. On the phone with a caller now. 21 marchant in hyannis port for a possible o. D. Reporter a possible overdose at this storied family compound in hyannis port, massachusetts. Authorities responding to emergency calls around 2 30 thursday afternoon. Bring that ambulance closer to the front door. Three minutes. Reporter First Responders finding hill in the same home where her grandfather lives. The exact cause of death still under investigation. Hill is the daughter of Courtney Kennedy hill, rfks fifth child. The Kennedy Family saying in a statement, our hearts are shattered by the loss of our beloved saoirse. Her life was filled with hope, promise and love. Her 91yearold grandmother ethel adding, the world is a little less beautiful today. The family sharing that saoirse was an advocate for human rights and womens empowerment, but three years ago while in high school, hill opened up about her struggles with depression writing in her student newspaper, quote, i suffered bouts of deep sadness that felt like a heavy boulder on my chest because many people feel uncomfortable talking about it. No one is aware of the sufferers. This leaves people feeling even more alone. So glad to see you all again, and welcome to hyannis port. Reporter the iconic Kennedy Compound in cape cod is cemented in American History with sweeping ocean views and lush manicured lawns. The sixacre estate has been a refuge for the kennedy clan dating back more than 90 years. John f. Kennedy with his wife jackie spent summers there with their children. It served as the primary residence for senator ted kennedy in his final years. Sadly, the Kennedy Family is all too familiar with tragedy. This year marking the 20year anniversary of that deadly plane crash that took the lives of jfk jr. , his wife and sisterinlaw. As for the investigation here, authorities still looking into the exact circumstances surrounding saoirses death. Cecilia . Such a tragic story. Okay, whit johnson, thank you. We turn now to that major flooding in the heartlan its hitting kansas hard leading to water rescues. This as a tropical threat moves toward the southeast. Rob is tracking the very latest. Good morning, rob. Good morning, michael. Some of that tropical moisture already getting into the southeast. This is what marietta looked like yesterday, just north of atlanta. Severe thunderstorms, talking about 3 1 2 inches of rain in a short period of time. 66mileperhour winds there doing damage to trees as well. This is the wave that brought heavy rain into puerto rico, now into florida, parts of georgia and South Carolina as well. This will bring thunderstorms. This could produce water spouts in the way of wind damage, and in the atlantic, were watching this closely as well, we have several days if not a week to deal with that. Lets talk about whats going on in kansas. Heavy rain in eastern kansas. 9 1 2 inches in about a 36hour period. Flash flooding happening there, and this is a front that is not moving. Were looking at the same situation today. Flash flood watch for eastern kansas, nebraska, getting into parts of oklahoma, missouri and arkansas as well. Flash flood until 8 00 tomorrow morning. Well update you on whats going on in hawaii in just a few minutes, george. Thanks very much. Well go to the white house now and President Trumps decision to add new tariffs on imports from china. The announcement already rocking Financial Markets and the president defended his decision at a Campaign Rally last night where he continued to take aim at American Cities run by democrats. Abcs Kyra Phillips is at the white house. Good morning, kyra. Reporter good morning, george. After that racist chant about democratic congresswoman ilhan omar broke out at trumps last rally, all eyes were on the president and his supporters last night. President trump didnt back off from namechecking his rivals either, but he certainly was not afraid to go after many of their districts. In front of a rowdy crowd in cincinnati after a week of railing against baltimore, president p escalating his attacks on a number of major u. S. Cities. Look at los angeles with the tents and the horrible, horrible, disgusting conditions. The conditions in Nancy Pelosis once great city of San Francisco are deplorable. We can name one after another, but i wont do that, because i dont want to be controversial. Reporter and also touting a trade policy that could hit his supporters in rural america. The era of economic surrender is over. [ cheers and applause ] reporter just hours after announcing another 10 tariff on 300 billion of chinese products. Until such time as there is a deal, we will be taxing the hell out of china. Thats all there is. Okay . Reporter the tariffs likely to raise prices on a wide range of consumer goods for americans. China responding with tariffs of their own hiking taxes on crops imported from the u. S. , impacting American Farmers bottom lines. Potentially a tough sell in battleground ohio, but trump standing firm. Chinas paying for those tariffs. Reporter and george, chinas seeing things a little bit differently this morning. Beijing is pledging to respond with countermeasures now saying that while they dont want a trade war, they are not afraid to fight one, george. Okay, kyra. Thanks. Lets get more on this now from our chief economic adviser Rebecca Jarvis. When this president sent out this tweet, you saw this swing in the stack market. And this is the tit for tat that wall street was worried about with a trade war from the very beginning. Now every single chinese good that comes to the u. S. Is going to be subject to a tariff, and in real terms, those are things that people use. Toys, clothes, shoes, electronics, and thats why you saw the stocks of retailers like target and nike and best buy, they were hit especially hard. These businesses either have to eat those costs, george, or pass them off to the consumer and most people are anticipating that consumers will pay higher prices as a result. The president says china will pay it. Thats not entirely accurate. It works as a tax on the american consumer. It works as a tax on everyone. Thats why an analyst called it a sword at the throat of the u. S. Economy. The Federal Reserve has laid out the fact that tariffs are the single biggest threat to the u. S. Economy and the global economy. What they ultimately mean is that prices go higher, you see it in your 401 k and in the longer run it can hit jobs because if businesses are either passing these costs off to consumers or absorbing they will, and that will ripple down to the jobs theyre employing and thats a big issue for the economy and potentially the election ahead as well. Hard to see the strategy here. Rebecca, thanks very much. Cecilia . Now to the details about the plan to end the war in afghanistan. The u. S. Is reportedly nearing a deal with the taliban. The pentagon says the nearly 18yearlong war has cost nearly 2,300 american lives and roughly 45 billion a year. Our Foreign CorrespondentJames Longman is tracking the latest on this. Good morning, james. Reporter good morning, cecilia. President trump has long promised an end to what he calls americas endless war, and this morning, we have new details on some of the specifics of the troop withdraw, but the negotiations have a long way to go. This morning, the major changes planned for americas longest war. The u. S. Is looking to withdraw thousands of troops from afghanistan in exchange for a taliban cease fire and commitment to eliminating any safe havens for terrorists. The Washington Post reporting if conditions are met, the United States would specifically reduce the number of troops from 14,000 to between 8,000 and 9,000, roughly the same as when President Trump took office. Secretary of state mike pompeo teasing progress in afghanistan early they are week. In the next handful of weeks, well have significant progress we can announce. Reporter now this is not a done deal. Deadly attacks by the taliban continue, and in some question their real commitment to peace. Will they take advantage of a u. S. Exit to retake power . A spokesperson tells abc news the d. O. D. Has not been ordered to draw do, and our troop wills remain there at appropriate levels so long as their presence is required to safeguard u. S. Interest. Cecilia, dont forget, isis is now growing in strength there too. That is true, james. One more headline for you this morning. North korea it appears has fired another round of what seem to be these short range missiles. This would be the third launch in just a week. President trump though, james, says, he doesnt have a problem with it. Reporter thats right, cecilia. Even though they are in violation of the u. N. Resolution, and trumps often used a pause in testing as proof of his success in associations but new talks, they dont feel any closer. They dont. Michael . Now to the investigation under way to that massive deadly gas line explosion in kentucky, killing one person, injuring several others and flattening homes around it. Abcs alex perez is on the scene in lincoln county, kentucky with the latest. Good morning, alex. Reporter good morning, michael. People who live here say it sounded like a war zone. I want you to take a look behind me. You can see some of those charred cars and debris here. You see that orange fence that marks the exact explosion sites. Authorities are now trying to figure out what caused all this. This morningfederal investigators expected on the scene of this massive explosion. The 1 30 a. M. Blast rocking this rural community, the roar jolting residents out of bed. You could feel the ground moving and tumbling and rolling. Reporter the highpressure 30inch high gas pipeline exploding, a humongous fireball shooting 300 feet into the air. Some residents suffering burns as they ran for their lives. It looked like a tornado, like a fire tornado. It was so hot, i dont i dont see how we got out of there. Reporter daylight has shown the extent of the blast zone. Land completely charred, cars melted. At least five homes decimated. Jason griffith says it looked and sounded like a war zone. It looks like a bomb has been dropped. It has leveled everything around it. There is nothing left. Its just gone. Reporter a 58yearold woman who was trying to escape the blast was killed. The 9,000mile pipeline that runs through here carries natural gas from the gulf of mexico to the northeast. Investigators now trying to pinpoint what exactly triggered the rep tour. All things considered, Authorities Say this could have been much worse. They say they are very lucky that more people were not killed. Michael . Devastating images there. Alex, thank you so much. Cecilia . Now the new shark sightings from cape cod to florida shutting down beaches. Take a look at this new video. A shark in florida there catching a wave with surfers. No thank you. Victor oquendo is on miami beach with the latest. Good morning, victor. Reporter good morning, cecilia. One of the surfers here in florida falling off his board at the wrong time. The danger lurking all the way up the east coast and officials forced to shut down several beaches because so many sharks were spotted near the coast. This morning, shark sightings leaving beachgoers on edge in cape cod. More than ten spotted close to shore in the last 48 hours, forcing officials to close the popular beach. Take a look at this video. Massachusetts state police spotting two sharks while flying above long nook beach. This summer of close calls up and down the east coast. In this new video from florida, a drone capturing a shark darting between two surfers in satellite beach. I was yelling to him, hey, theres a shark. Theres a shark. And i dont think he heard me because he fell off his board at just the wrong time. Reporter earlier this summer in new smyrna beach, dubbed the shark capital of the world, dan watson was playing in the surf when this drone spotted a shark swimming feet away. I screamed that my wife was closer to the kids, to get everybody out of the water. Reporter less than a week ago in jacksonville beach, recorded by frank orourke, struggling to stay above water as what was believed to be a black tip bit him. You have all the rows of teeth just kind of clamped onto my arm. Reporter so far this summer, there have been reports of at least 24 unprovoked shark attacks and were just now entering the peak season for shark activity. According to the Atlantic White shark conservancy, august through october are the peak months. Some easy safety tips here. Dont swim alone and be careful if you go past waistdeep water, dont splash around too much. Whats driving the search there in cape cod . Reporter well, its all about what sharks eat. In this case, gray seals. There have been Recovery Efforts for gray seals over the last decade. They have gone well, but that also attracts more sharks to the water. Cecilia . Great tips. Okay, victor, thank you. Michael . I should become a Swimming Pool builder. Stay home in the pool. Were going to go now to a wild Emergency Landing that happened right on the highway in washington state. A state troopers dashcam capturing the moment. You see that plane closing in on the road. That trooper was a quickthinking one. He made a uturn, slowed down to block the traffic to give the plane room to safely land. The plane came to a stop right at a red light. The pilot said he didnt want to get a ticket for running it. Thats skill. The trooper said the plane had a fuel system malfunction and amazingly, no one was injured and there was no damage. Can you imagine seeing that . Youre driving down the street, coming at you. Amazingly enough, the road was open for him to land at the moment. A skilled pilot as well. More crazy video for you. Take a look at this. A close encounter. Yes. Thats a bear. No. You hear her. Thats a jogger on vacation. This bear charges right at her. Her fitbit shows her heart rate right at the moment. You can only imagine what that looked like. Well tell you about what she did to survive. And we have a surprising headline about your guacamole. This made cecilia mad earlier. As avocado prices spike, why some restaurants are using mock guac. Wait until you hear what you might be eating. First, back to rob. Fake stuff, real stuff. I love me some guacamole. Bring it on. Well take you to hawaii where pineapples are the thing of choice. Theyre dealing with erick. This is the big island south shore, what is now Tropical Storm erick making inroads there and making waves. You saw it. Now its about 350 miles south of honolulu, and it will keep that southern trajectory, and it will continue to weaken. Water temperatures here right around 80 degrees. Thats the cusp of seeing any sort of strengthening. Flossie, were worried about it because of the name. Thankfully, and its in weakening mode. We getting more confidence now as it would be heading towards hawaii, and steering to the north. Well take that. Likely thing is a Tropical Storm sunday night right before monday morning. Theres one behind this one. Plenty of time to watch that. Time for your weekend getaways brought to you by pronamel. We showed you the waves we showed you the waves crashing on the lava rock, the black sand beaches of hawaii. Check out this video earlier in the week of a dust devil basically going over a coal field. So that is coal. Black coal is being sucked up into this dust devil. Were calling it a coalnado. I dont remember reading about that in meteorology school. There it is. Proof in the pudding. Dirty tornado for sure. Thank you, rob. Pitbull is coming up. Hes in the park, going to perform live. E park, going to perform live. 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