cdc panel voted no on. when asked for boosters fs for people with jobs at high risk, the cdc voting 9-6 against it. dr. jha standing by. how soon this all starts for millions and why that no vote for some. there is also that developing headline in the search for brian laundrie tonight. a person of interesting in the gabby petito case. the news coming in, that arrest warntd for the fbi. new york city and much of the northeast bracing for possible flash flooding tonight. alerts in several states. delaware, new york, up to massachusetts. damaging winds possible and rob marciano timing this out. tonight, the change at the border. after those images of border patrol agents on horseback confronting migrants, tonight, the department of homeland security temporarily suspending the use of horses in del rio, texas. thousands remain under that bridge. tonight, the u.s. special envoy to haiti resigning in protest to the biden administration's handling of this crisis. the capitol hill showdown over president biden's agenda. rachel scott in the halls of congress, pressing moderates and progressives, asking, will democrats unite to save the president's plans? how they answer. and all of this amid a looming government shutdown. the white house now warning federal agencies to prepare. the terrifying fall. a toddler falling into an open manhole at a playground. his mother jumping down into that hole to save him. and america strong tonight. thousands rallying behind a mom and her scones, after learning what she did during the pandemic. good evening and it's great to have you with us here on a thursday night. several breaking headlines. booster shots approved for millions, but one group they voted no on. also, the fbi with an arrest warrant in the search for brian laundrie. but we are going to begin with that deadly shooting at a grocery store. colli collierville, tennessee. police receiving a call, four minutes later, law enforcement arriving at the scene. the fbi now on the scene, too. officers running toward the gunfire, securing the scene inside, finding employees and customers hiding in freezers and in offices. 13 people shot, at least one person has died, several people have now been rushed to the hospital. the shooter also dead, apparently shooting himself. one worker climbing to the roof to survive this. another worker describing the desperate rush to hide, saying the gunmen kept on shooting and shooting. tonight, what we're learning about the suspect already. and abc's chief justice correspondent pierre thomas leading us off. >> reporter: tonight, shoppers and employees running for their lives at this tennessee supermarket as shots ring out. >> they have four to six victims at this time. >> reporter: local police, s.w.a.t. teams and federal agents swarping the scene. a kroger supermarket about 30 miles east of memphis. >> there's over 200 police cars out here. >> reporter: authorities say the gunman opened fire around 1:30 this afternoon. killing at least one person, and wounding at least a dozen more. >> he kept on shooting and shooting and shooting. he shot one of my coworkers in the head. >> as bad as this scene is and it's horrific, i've been involved in this for 34 years and i've never seen anything like it. >> reporter: officers canvassing the building, searching for survivors. >> we found people hiding in freezers and in locked offices. and, you know, they were doing what they had been trained to do. run, hide, fight. >> reporter: one worker fleeing to the roof for safety. police say they found the shooter dead of an apparent self-inflicted gunshot. the suspect's vehicle located in the store parking lot. >> we are waiting on some additional equipment to get here, to be able to safely check that vehicle. >> reporter: supermarkets again on the list of soft targets attacked by lone gunmen, after that horrific shooting at a colorado supermarket earlier this year, in a nation reeling from a stunning surge in mass shootings. >> and pierre thomas, our chief justice correspondent, back with us tonight. and pierre, you have late reporting on a possible motive here? >> reporter: david, tonight, tennessee sources are saying that police are looking into whether this was another tragic case of workplace violence. and david, we have some truly stunning numbers. there have been more than 2,500 people shot and more than 500 victims killed in mass shootings so far this year. truly stunning, david. >> pierre thomas leading us off tonight. pierre, thank you. and now to that major news on the pandemic. the cdc late today clearing the way now for millions of americans to get booster shots. the panel voting yes to americans 65 and older getting the pfizer booster six months after the second shot. and yes on boosters for adults 18 and older with medical conditions that put them at high risk for the virus. but voting no to boosters for people who have jobs that put them at high risk, front line workers, teachers among them. dr. jha standing by to break all of this down, what you need to know. how soon this begins. but first, abc's whit johnson tonight on the cdc decisions that came down late today. >> reporter: tonight, that decision from the cdc paving the way for millions more americans to start getting booster shots. >> yes, this motion passed. >> reporter: an advisory panel voting to recommend a third pfizer shot six months after a second dose to people 65 and older, long-term care residents, people 18 and older with medical conditions putting them at risk. but where the panel said no was on this question -- should there be a booster shot for people whose jobs put them at high risk of infection? like teachers, day care staff, grocery and health care workers. >> i think the health care workers are critical and cannot be forgotten. >> reporter: the panel voting 9-6 against giving those frontline workers booster shots. >> the nays have it, and the recommendation does not pass. >> they were considering whether or not to say that everyone who was in a workplace where transmission is high or likely, such as, for example, a hospital should get a vaccine. they didn't vote for that. >> reporter: more than 13 million americans over 65 are already at least six months past their second pfizer dose. >> i am over 65 and it can't help but protect me better. >> reporter: health officials not ruling out extending boosters to more people over time as more data becomes available. >> they were seeing a waning of immunity against severe disease, particularly in the elderly. and for that reason, that's why they made their decision based on their data that they were going to give a boost. the boosters will be available to the newly eligible group as early as tomorrow at more than 30,000 locations across the country, including urgent care clinics, some federally qualified health centers and pharmacies. at least 1,900 sites available in new york city alone. >> we're ready. we know how to do this. >> reporter: the cdc saying side effects from booster shots were similar to what was reported after earlier doses. 2 million immunocompromised people have already received boosters. like teacher karla mench, who got her third shot earlier this month. >> it was a simple piece of paper i filled out and had to just mention that i had a kidney transplant. >> reporter: for people who got the moderna and johnson & johnson vaccines, it will be a longer wait for boosters. >> hopefully, we're only a few weeks away from seeing clear recommendations from moderna or clear recommendations for j&j, because right now, those people are kind of left out in the cold. > reporter: so, how soon could these booster shots be available? the cdc director still needs to sign off. that could happen at any moment. once it does, people who got the pfizer shot and who qualify for a booster could start to line up at pharmacies like this one as early as tomorrow morning. david? >> all right, whit johnson here in new york tonight. whit, thank you. we know many of you at home have questions because this is the pfizer booster first. they applied for authorization for their booster first. moderna and johnson & johnson could be applying in the coming weeks. in the meantime, let's bring in dr. ashish jha. great to have you. the cdc tonight backing the single pfizer booster after six months for those 65 and older, for those 18 and older with underlying health conditions and given the data that you've studied, you're completely comfortable with this? >> good evening, david. yes, i am. i think the data supports that quite strongly and i think the cdc panel got that one right. >> the one surprise here, the experts were asked about those with jobs that have a high risk of infection, front line workers, teachers among them. the vote was no. 9-6 on this. a lot of those workers are watching the news here tonight. can you explain why the cdc said fwho no to them? >> yeah, this is anned advisory committee vote that i don't understand. i think about an icu nurse that is nine months out from her second shot, she needs a booster. i'm hoping the cdc director will jeefr rule this, but i don't think this was the right decision by the advisory committee. >> and this panel did leave open the door to amend this as they move forward. and dr. jha, with a few seconds left, you mentioned the cdc director there, if she signs off on this tonight, these boosters begin immediately? >> they do begin immediately. and they can be revisited at any point. we can expand the list, but people should be able to get boosters very quickly. >> jchlt jdr. jha, thank you. we continue on this very busy news night and we learned just moments ago that the fbi has now issued an arrest warrant for brian laundrie, who was traveling with gabby petito when she went missing. she was later found dead. tonight, what those charges are fur and new details of gabby petito's final days. a witness describing the scene at a wyoming restaurant between the two. here's trev vow auor ault again tonight. >> reporter: tonight, an arrest warrant issued for brian laundrie. the decision coming as the final days of gabby petito's life are coming into clearer view. >> you could feel his temper. >> reporter: nina celie angelo claims she saw petito and laundrie in an explosive confrontation at merry piglets restaurant in jackson hole, wyoming. >> he was just very visibly angry. she was crying and he immediately went to the hostess stand and was just, yeah, he was just like going in on the hostess and the waitress and then eventually, the manager. >> reporter: that was august 27th, three days after investigators had originally said gabby was last seen and the same day her mom received a final text from gabby's phone, reading, "can you help stan? i just keep getting his voicemails and missed "buts. stanll is gabby's grandf and gabby's mother says she never called him that. and the city of moab, utah, now launching a formal investigation of the response to a fight between the couple days prior. today in florida, laundrie's parents retrieving the ford mustang the fbi towed from their home monday. the car they told officials brian drove to a nearby nature reserve last week before he vanished. tonight, drones and dive teams again searching for him in that unforgiving alligator-infested terrain. and to be clear, brian laundrie is not charged with gabby petito's homicide. she's charg he's charged with illegally using a debit card that didn't belong to him. in regards to gabby's disappearance, for now, he is simply a person of interest. david? >> all right, trevor, thank you again tonight. and there's news this evening on the search for a missing woman from washington state, an indigenous mother of two in las vegas to get married. she was traveling with her fiance and two friends when she disappeared earlier this month. they returned to the reservation without her. the family says a woman at the motel was the last person to see her. 57 indigenous people reported missing in washington state just this year. we're going to turn now to a major change at the u.s. border in texas tonight, after those images of border patrol agents on horseback confronting migrants. the department of homeland security temporarily suspending the use of horses in del rio, texas. thousands remain under the bridge there tonight. president biden being blasted from all sides. tonight, his special envoy for haiti resigning in protest over inhuman deportations. abc's kenneth moton on this again tonight. >> reporter: tonight, after those images of mounted border patrol agents aggressively confronting migrants, homeland security today temporarily suspending the use of horses in del rio, texas. >> we feel those images are horrible and horrific. i can also convey to you that the secretary also conveyed to civil rights leaders earlier this morning that we would no longer be using horses in del rio. >> reporter: and in a scathing letter, the u.s. special envoy for haiti, daniel foote, kwifting, cikwift i quitting, citing the "inhumane, counterproductive decision to deport thousands of haitian refugees and illegal immigrants to haiti." fewer than 4,000 migrants remain under that del rio bridge, nearly two-thirds, families. >> i work ed on the border my entire career. over 20 years of law enforcement. i've never seen nothing to what i saw in del rio, texas, was very disturbing. >> reporter: border patrol aiming to get everyone out by the end of the week. thousands of migrants have been loaded onto buses and planes transported to other u.s. cities or deported. desperation at the airport in port-au-prince just days ago, as a group of haitians removed from the u.s. tried to rush back onto the plane. david, more than 1,400 migrants have been sent back to haiti on a dozen flights this week. at least 3,000 still here in the u.s. being processed or preparing to be deported, but the numbers from dhs are still coming in. david? >> kenneth moton, thank you. now, to the capitol hill showdown over president biden's agenda. democratic leaders said today that they've agreed to a framework, was their word, for how to pay for that massive nontraditional $3.5 trillion inf infrastructure plan for pre-k, family leave, climate change and other issues, as well. they still haven't decided if that price tag will shift, if it will come down. and then, there's the $1 trillion bipartisan inf infrastructure plan. the question, obviously, will both get passed to save the president's agenda? rachel scott asking democrats that question on the hill tonight. >> reporter: tonight, democratic leaders feeling the pressure, trying to show they are making progress on president biden's domestic agenda. >> the white house, the house and the senate have reached agreement on a framework that will pay for any final negotiated agreement. >> so progress on how to pay for the bill, but no agreement on how much it will cost. and that's the real sticking point. today, speaker pelosi defensive. >> this is not about price tag. it's about values, not dollars. >> reporter: for moderates like senator joe manchin, it is about the price tag. progressives want $3.5 trillion for everything from child care to fighting climate change. manchin wants a whole lot less. >> is there a consensus yet on a price tag? >> we don't know. >> reporter: progressives now threatening to tank the bipartisan infrastructure bill unless they get that what they want in a larger deal. bottom line, both bills or nothing at all? >> that's what it is. >> reporter: progressives saying both bills or no bill, turning up the heat on speaker pelosi. are you confident that you have enough support within your own party to move forward with a vote on monday? >> we take it one day at a time, but i'm confident we will pass both bills. >> all right, the speaker saying one day at a time. rachel scott live on the hill tonight. rachel, we're talking again about two bills here. the $1 trillion bipartisan in infrastructure bill and then that $3.5 trillion human inf infrastructure plan, early education, paid family leave, climate change. but we all listened to what progressives told you there on the hill today, they say they won't vote on one without the other. so, where does that leave the president's agenda tonight? >> reporter: well, david, the reality is, speaker pelosi faces the same challenge that she has for months. she needs the votes of her entire caucus. right now, she does not happen. congresswoman jayapal told me tonight if that bill comes to the floor, it will fail. david? >> rachel scott, thank you. when we come back here, new york city and much of the northeast bracing for possible flash flooding tonight and dangerous winds. rob marciano timing this out. with dupixent i can du more... yardwork... teamwork... long walks.... that's how you du more, with dupixent, which helps prevent asthma attacks. dupixent is not for sudden breathing problems. it's an add-on-treatment for specific types of moderate-to-severe asthma that can improve lung function for better breathing in as little as two weeks. and can reduce, or even eliminate, oral steroids. and here's something important. dupixent can cause serious allergic reactions, including anaphylaxis. get help right away if you have rash, shortness of breath, chest pain, tingling or numbness in your limbs. tell your doctor if you have a parasitic infection, and don't change or stop your asthma treatments, including steroids, without talking to your doctor. are you ready to du more with less asthma? just ask your asthma specialist about dupixent. i brought in ensure max protein, with thirty grams of protein. those who tried me felt more energy in just two weeks! 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