Here are tonights headlines. Water rescues underway in tennessee after more than 10 inches of rain falls in under 24 hours. Literally everything in our yard, it floated away. John mass chaos in new Yorks Union Square after crowds gather for a giveaway of Gaming Consoles and computers. We have seen at least a dozen people being arrested. John School Shooting reenactment. Investigators fire dozens of rounds as part of a trial against the parkland, florida, resource officer, who never entered the school. He is still guilty of running away from our children. The victim in the decadeslong gilgo beach murders investigation has been identified. Authorities say jane doe number 7 was karen vergata. I think it is important that we remember and honor not only miss vergata, but all of the victims on gilgo beach. John as the Writers Strike nears hundred days, the widespread effect it is having as a multibilliondollar industry sits at a standstill. 10 or 11 jobs every day. It drops to maybe one or two jobs. John hospitals and Emergency Rooms across multiple states shut down after a cyber attack. Their wedding was like a fairy tale. House on fire. And that was the end of that. But unbeknownst to the Bride And Groom, angels were swooping in. To have them pick up the reception out of ashes made the wedding better than we could have imagined. John good evening, and thank you for joining us on this friday night. Im John Dickerson in for norah. We begin tonight with chaotic weather across much of the nation, from scorching heat to thunderstorms and heavy rain. Millions of americans are under flood alerts tonight, and flash flood emergencies were declared in parts of kentucky and tennessee this morning after Torrential Downpours dropped nearly a foot of rain in some areas. Entire neighborhoods are underwater in union city, tennessee, where residents were rescued from their homes and evacuated. In the rest of the south, its the heat making things dangerous for 65 million americans. Its been that way almost every day this summer in arizona and texas, where cbss Omar Villafranca starts us off with the latest. Reporter tonight, Severe Weather slamming parts of the south. I want you to see how deep this is. Reporter nearly a foot of rain falling over 24 hours in northwest tennessee. The flash floods forcing emergency evacuations. This trailer Park Community under waistdeep water, some two dozen people rescued onto dry land. Looked outside, and literally everything in our yard, it floated away. I had to get my cat, and literally the clothes on my back. Almost up to our porch now. Reporter a frightening scene in union city, tennessee. Video taken from a front porch showing the widespread high water levels. Parts of kentucky and alabama soaked, too, leaving this roadway washed out. This comes as the recordbreaking heat makes a comeback across the south and west. Millions of people, from texas to arizona under tripledigit excessive heat warnings, as folks brace for the return of oppressive temperatures. The agency that manages texas power grid has issued a watch for next week, when we are expecting more temperatures in the triple digits and demand to be up. Now, they say so far the power grid has held up even after setting seven new peak demand records just this summer. John . John Omar Villafranca, thank you. The threat of heat and severe storms is far from being over, so lets bring in meteorologist chris warren from our partners at the weather channel. Good evening, chris. Good evening, john. We are tracking a dangerous Severe Weather threat for the northeast. But as omar was showing us, this is a very heavy rain setting up overnight across parts of tennessee, leading to some widespread flooding. That has since dissipated. Our focus here turning on the northeast, with more strong storms, golf ballsize hail possible, with some of these storms 6065mileanhour winds also a possibility. Meanwhile, dangerous heat continues across a lot of the south west and southern plains, right into early next week, and once again, john, temperatures will be well into the triple digits. John chris, thank you. Mayhem broke out in new york city this afternoon when thousands of young people flooded the streets after a popular Social Media Streamer promoted a giveaway. Cbss Lana Zak Reports The Nypd deployed more than 1,000 officers to control the chaos and made multiple arrests. Reporter chaos erupted in manhattans Union Square Park as a large, rowdy crowd gathered for a free giveaway by a social media influencer. Thousands descended on the park after Popular Twitch star kai cenat, who has millions of followers online, promised free playstations to his fans. The crowd grew agitated, forcing cenats Security Detail to shield him and move him to safety. From a nearby Construction Site forcing the nypd to call in its highest level of mobilization. This assembly is unlawful. You are ordered to disperse. Reporter more than 1,000 responded. We were there as police cleared the crowd. The nypd is starting to physically move in. In a formation in front of this area. There are reports that several officers were injured as some nearby businesses had to evacuate their stores. At this time, we successfully dispersed. We still have crowds roaming around manhattan, and we have officers following them, preventing them from destroying property. Cenat was later seen getting into the back of a police suv. It is unclear where he is right now. The situation here was extremely tense, at times. We understand that cenat did not have a permit for the event and is currently being questioned by authorities. John . John lana zak, thank you. Today, one of the deadliest shootings in American History was reenacted at a school in parkland, florida. Nearly 140 live rounds were fired inside Marjory StonemanDouglas High School as part of a civil lawsuit against the officer who was supposed to protect the school that day. Cbss Manuel Bojorquez spoke to some of the victims families on why they wanted this day to happen. Reporter Ballistics Experts spent hours inside the schools 1200 building, shooting live rounds that would mimic the sounds heard during the 2018 mass shooting. [gunfire] eerie, painful, but necessary, says tony montalto, whose daughter, gina, was killed. Why a reenactment . The reenactment is an attempt to disprove the falsehoods that were mentioned during the trial of the failed deputy, Scot Peterson. Reporter details of the reenactment included setting off a fire alarm that blared during the shooting, retracing the shooters footsteps along the second and third floors, and firing up to 139 rounds, the number fired that day. All to see what it may have sounded like outside, where Surveillance Cameras captured former School Resource officer Scot Peterson on a golf cart, and later taking cover outside the building on his police radio for more than 40 minutes. He did not go inside to try to stop the shooter, who killed 17 people. The defendant is not guilty. Reporter a jury in june found him not guilty of several charges stemming from his response to the shooting, in a separate criminal trial. His attorneys argued he could not tell where the shots were coming from due to echoes. He is still guilty of running away from our children. He is still guilty from running away from the students and teachers who depended on him for protection. Reporter it is unclear at this point whether the judge will allow the reenactment to be used as evidence during the upcoming civil trial, but it had to be done now because the building is set to be demolished. John . John Manuel Bojorquez, thank you. There is an update on the federal case concerning former president Donald Trumps handling of classified documents. Three additional criminal charges were filed last week, and today, trump submitted a not guilty plea and does not plan to appear in person next week for his arraignment on those charges, which include trying to destroy surveillance video. Thursday, trump pleaded not guilty to the most recent indictment, charges stemming from his efforts to overturn the 2020 president ial election. Trump spoke moments ago at a Campaign Rally in alabama. They want to silence me because i will never let them silence you. In the end, they are not after me, thereafter you and i just happen to be standing in their way. John trump continues to hold a dominant lead in the race for the 2024 republican nomination. Police in the Gilgo Beach Investigation have identified a possible Seventh Victim using dna technology. Cbss Shanelle Kaul reports investigators have not confirmed a link between the victim and suspect Rex Heuermann, who has been charged with the killing of three other women. Reporter for 27 years, she was known only as fire island jane doe. Today, her true name. We are able to identify fire island jane doe as karen vergata, who was 34 years old at the time of her disappearance. Reporter Suffolk CountyDistrict Attorney ray tierney says vergata lived in new york city and worked as an escort before disappearing on valentines day in 1996. Her remains were found in two locations near gilgo beach. Last year, police used dna testing to confirm her identity. Using a buccal swab from a relative. Reporter the identification comes after Rex Heuermann was arrested last month and charged with the murders of three victims. He has pleaded not guilty. He is also suspected of murdering a fourth woman, but authorities wont say today if he is linked to vergata. It is important to note that there are no charges at this time. Reporter vergata is among 11 people found dead near gilgo beach. Most were escorts. Criminal defense attorney Joe Tamburino says there could be a connection. And this could be a pattern, and possibly his first one, ms. Vergata, is the same type of victim that we see in the other cases. Reporter and this week, prosecutors asked for a courtordered dna sample from Rex Heuermann, hopefully to determine whether or not he is connected to any of the other bodies found here near gilgo beach. John . John Shanelle Kaul, thank you. Tonight, the fbi is investigating a cyber attack targeting hospitals and clinics in at least four states thursday, forcing several Emergency Rooms to shut down. Prospect medical Holdings Says it took its Computer Systems offline after learning it had been breached by hackers. The problem also caused urgent care and elective Surgery Centers to close and ambulances to be diverted. The systems are not expected to be online until next week. The Labor Department reports the u. S. Added 187,000 jobs in the month of july, which was less than expected. One possible reason for the slow down was the entertainment industry, with thousands of writers and actors out of work and on the picket line. Cbss Jonathan Vigliotti reports on the wider Economic Impact as the wga strike new years day 100. Union power union power reporter Hollywood Writers and actors hit the pavement yet again, as the Writers Union met with Studio Executives for the very First Time Since their strike began. I think it is helpful because it has been crickets, it has been silence for a long time. Reporter in california, film and Tv Production accounts for more than 700,000 jobs and nearly 70 billion in wages. We are really fighting for the rights of the people who are working and living in this city. Yeah reporter Konstantine Anthony wears many hats. He is an actor and the mayor of burbank, home to several major studios. If people arent coming to work, if people are on strike, they are not spending money at their local grocery stores. All of those secondary industries are greatly affected by the loss of that income. Reporter that includes alex ucedas catering company, typically feeding hollywoods film and tv crews. At the end of last year, we were working 1011 jobs every day. It drops to maybe one or two jobs. Reporter he says he has had to lay off nearly half of his 50 employees. Are you able to give me a sense, percentagewise, how much business you have lost . I would say at least 70 . Corporate greed has got to go repororter Picket T Lines Gw Last Monthth as actors b began o strike, as well. Top stars have donated 1 million each to help others pay their bills. For those who Depend On Hollywood to make a living, todays talks bring a glimmer of hope. I beg all the people from the studio, please, please make it happen, you know, for the good of everyone. Reporter and many Fall Television shows and films are already delayed. Even if a deal is reached, could take several weeks if not longer to ramp up production, john. John Jonathan Vigliotti. Thank you, jonathan. Turning to the invasion of ukraine, a Russian Navy Ship was apparently damaged overnight in what ukraine says was a drone strike. Ukraine says this video shows a sea drone approaching the russian ship at a port in the black sea. The video drops out on impact. Another unverified video shows the ship listing to its side as it is being towed away. 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