this is "nightline". >> tonight, plots thickens -- >> he wants to kill 100 people, at least 100 people, have fun doing it. authorities say there's been a surge in attempted mass shootings... ohio -- florida -- connecticut. claiming some are connected to a rising white supremacy. as we track hate across america -- and the race to stop future bloodshed. plus, rising star -- coco gauff -- from her historic showing at wimbledon. the young tennis phenom serving win after win -- smashing her way into hearts worldwide. now, robin roberts one-on-one with the star. the sky isn't the limit.

you can go as far as you want. inside her continuing climb to greatness. but first the nightline. number one in just sixty seconds.

>> good evening. thank you for joining us. shootings -- authorities say they thwarted multiple attempts -- now a link being

drawn between some of this violence and white supremacy in this country -- as some look for reasons behind the growth of this hate -- others are in a race against time to find -- and stop the next potential mass shooter. >> i, dalton barnhart, vow to bring my father's m15 to school and kill seven people at a minimum. >> a 15 year old florida boy's alleged threat to shoot up his school read by the police officer arresting him. his mother standing by his side. >> he's just a boy playing video games. >> this case one of several alleged close calls in just the past few days. >> he talks about how he wants to die in his text messages. and when he dies, he wants to kill 100 people, at least 100 people. have fun doing it. multiple alleged would-be mass shooters all arrested by law enforcement before they could carry out their deadly plans. >> bodycam video recording one of the dramatic take downs. >> do you have any weapons that we need to know about? >> potential tragedies averted just weeks after gunmen in el paso and dayton left 31 dead. suspects in connecticut, florida

and ohio all thwarted due to tips from the public. >> the connecticut suspect of committing a maoting.ncreasea clear picture is emerging. some of these killings are being plotted or carried out by white supremacists. >> the us has experienced a significant increase in violent activity from individuals and groups of individuals who believe in the white supremacist ideology. the director of the fbi acknowledging as much last month. >> a majority of the domestic terrorism cases we've investigated are motivated by some version of what you might call white supremacist violence. >> but the approach to addressing the issue has, so

far, been limited. in fact, not only has funding that can be used to address this threat been decreased, but the u.s. government through its anti-immigration and immigration enforcement priorities has actually played right into the ideological agenda of the white supremacist movement. >> to help fill the void, nonprofits have stepped in to play watch dog, keeping an eye on online hate groups. >> so this is our heat map, which means hate, anti-extremism, anti- semitism and terror. so it allows us to track in real time hate crimes wherever they're happening across the country. >> well, if this is an indication of hate crimes, we're in a bad place right now. >> i mean we've seen some pretty alarming trends in recent years. last year the fbi reports a 17 percent increase in hate crimes overall. >> at their headquarters in new york, the anti-defamation league monitors and tracks extremist ideology all over the country. >> i found this one guy who we

are not sure where he is. but he seemed to be threatening acts of mass violence toward women. >> and what would you do with that information? >> we will look at it. we'll assess it. if we think it's a credible threat, we'll pass it on to law enforcement >> but even with complex monitoring algorithms, and a vigilant team watching constantly for potential threats, people regularly fall through the cracks. >> people like james reardon, jr arrested days ago for allegedly threatening a mass shooting at this ohio jewish community center. >> the 20 year old self described white supremacist from youngstown appeared to be a normal kid to local reporter graig graziosi who has met with reardon several times. he seemed like a nice kid who was politically engaged. when i saw him when he got older it wasn't just political engagement anymore. it was ideological fervor. >> reardon even attended the 2017 charlottesville unite, the right rally seen here in this national geographic documentary.

he was happy to be associated with white ethno states with the idea of white supremacy. he was all about it. >> but he seemed to only get law enforcement's attention after posting this disturbing video on instagram. >> showing himself firing a semi-automatic weapon seemingly acting out his plan to kill. the caption on the post sounding like the way a report might cover his attack. police identified the youngstown jewish family community shooter as local white nationalist. the post also tagged the location of his alleged intended target. the fbi raiding reardon's house, where they say they found a large collection of rounds of ammunition, a gas mask and bullet proof armor. he was taken into custody on local harassment and aggravated menacing charges. reardon has plead not guilty. >> white supremacy is an ideology based on the belief that white people of european descent are intellectually and physically superior to nonwhites. but more importantly the ideology calls for action. >> i've never met you know a white supremacist with positive self-esteem. >> christian picciolini became a self-proclaimed white

supremacist as a teenager in the late 1980s, starting a white power rock band, seen in this hbo documentary, "skin heads usa, soldiers of the race war." and sharing his philosophy on cnn in 1992. >> i believe we're warriors and we're fighting for a great cause which is the white race. >> he says the white supremacist movement has gained momentum, attracting new recruits with the euphemism "white nationalist" to literally whitewash their hateful ideology. nobody really likes to be associated with white supremacy out in the open. so they come up with terms like white nationalist or alt right to make themselves sound a little bit more palatable. >> christan abandoned white supremacy in his early 20s, and now works to disengage youth from extremist ideologies. >> i can tell you that the antidote is not more alienation. it is not pushing them further away. we have to intercept these people before they get so desperate that they have to latch on to an ideology.

>> in the wake of the el paso shooting, president trump expressing his distaste for hate in general. >> i'm concerned for any group of hate. i don't like it. >> and tasking the justice department with targeting social media. >> work in partnership with local state and federal agencies, as well as social media companies, to develop tools that can detect mass shooters before they strike. >> but democrats say the trump administration has systematically cut back on resources used to address threats from domestic extremists. >> i think president trump isn't doing enough. he's hollowed out the department that is in charge of actually preventing these mass terror attacks that are launched domestically by groups that often are spewing hate white supremacy and white nationalism. >> presidential candidate and senator kirsten gillibrand

says the department of justice should infiltrate white supremacy groups. >> what was recommended after 9/11 is that our fbi our cia and erconters law enforcement work where all data all information is shared in real time so that we could support terrorism that needs to continue. >> and that kind of partnership between local and federal law enforcement does work. earlier this month, the las vegas joint terrorism task force along with federal authorities arrested this 23 year old self described neo-nazi who was allegedly plotting to bomb a las vegas synagogue or gay bar. >> i have my bushmaster ar-15 rifle. >> investigators say a search of his home turned up illegal guns, bomb making materials and a notebook outlining plans for reneheoras this picture from the 1960s hangs the adlofce american

history when leaders found the courage and conviction to lead. there's no sort of silver bullet that will stop this th you've got to realize that it takes an all hands on deck effort. >> abc news learning authorities have stopped what they say were two more potential pass shootings. up next, the young tennis star beating a legend -- capturing the crowd -- and now becoming a household name. ♪ here i go again on my own ♪ goin' down the only road i've ever known ♪ ♪ like a drifter i was-- ♪ born to walk alone! ...barb! you left me hangin' on the high harmony there. if you ride, you get it. geico motorcycle. 15 minutes could save you 15% or more.

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>> tennis star coco gauff is

only 15 years old -- and she's dreaming big -- to be the greatest ever -- she's already with her fairy-tale run -- now robin roberts with the exclusive interview with what's next for the rising phenom. >> let's talk about wimbledon. have you had time now to kind of reflect on what you accomplished? >> for me, i'm still like-- can't-- still can't believe it. >> this is coco gauff -- she's the 15-year-old tennis phenom who burst onto the world stage. taking on and beating the legendary venus williams in her debut at wimbledon. kiutus, s juurt i was not playinmy game. >> no small feat -- considering venus and her sister serena were two of coco's biggest role models and that she was playing in one of the biggest tennis tournaments in the world. >> the stands were full, people were cheering your name. everybody wanted a picture with you or wanted your autograph. what was that experience like

for you? >> for me, it was crazy because growing up, i just thought about winning tournaments and playing wimbledon and the grand slams. but i never thought about all that would come with it. coco was already the youngest qualifier in history to make the main draw at wimbledon, when she smashed her way into thousands of hearts, making it all the way to the final 16. beating veteran players like polona hercog. >> in upset after upset. >> how has your life i don't wanna say changed since then. but it is-- it is different. how's it been? >> i feel like as a person, i feel like i grew a lot just after that tournament 'cause i got to experience things that not many 15-year-olds get to experience. >> coco, riding high on her ayi wild card in the us open next week and she is in the zone. practicing 4 hours every day in the florida heat. >> we kinda try to practice when we can 'cause sometimes it rains. but it takes a lot -- a lot of work and a lot of hours.

>> when did it all sink in that, hey, i'm pretty good at this? >> as or me, i always, like, try to push myself. so i never tell it-- like, i know that i'm doing well. but i don't tell myself, oh, i'm pretty good i think 'cause i think i can always improve. >> who has given the best advice? and what was the advice on the court and also off the court? >> all my-- on the court i would just say my dad-- his best advice was just to tell me to go into the tournament believing i can win. and off court, for me, was just to-- just enjoy life and-- at the end, all this is gonna be over. after that, my tennis kinda improved-- jumped-- another level because i stopped putting so much pressure on tennis, tennis, tennis >> it's advice that's obviously worked for coco -- after all no one thought the 15-year-old could beat some of the world's top players. >> what do you want-- when people are watching you play, what do you want them to feel when they're watching you? >> for me, i just want them to feel that anything's possible and that, like, honestly, the sky's the limit. actually no. the sky isn't the limit. you can

go as far as you want i think that anything is possible at any age or any point in time of your life. >> i gotta say, coco, your composure, where does that come from? >> to be honest, i don't know, maybe from being the oldest. i'm the oldest sibling-- maybe that or maybe just playing tennis i think probably helps because i'm on the court alone. >> she may feel alone on the court -- but offcourt her family is with her every step of the way. her parents giving up their own careers to support coco -- dad corey is now one of her coaches..heco and her mother candi's ecstatic wimbledon celebrations went viral. we sat down with coco and her parents back home. >> reporter: did you realize you became a viral sensation at

wimbledon? >> not immediately. but, like, when i'm walking through the venues and -- people notice me or stopping me and -- and saying that, "you're coco's mom. you're coco's mom. >> when did you know that coco-- there was something that she had, that she had what my father would call that it factor? >> early on, like, around three years old. and i saw my daughter at a track-- event with my nieces. and she got out of her stroller. and she just started running. she was determined, determined trying to keep up with her nieces. >> she had an appetite to win everything we played. and so i knew that-- you know, that concentration, determination that she'd have an opportunity to be good in sports. >> coco first picked up a tennis racket when she was just 6 years old, hitting balls against her garage door. >> what is step one in training a tennis champ? >> get them to love the game. yes. if they don't, you make them do all you want. but eventually, they'll go to what they love. i would go out there and, you know, intermittently and play with her. so she just loved playing. so we made it real fun at the beginning. her family -- inspired by the williams' sisters careers, using them as a blueprint for coco's

own. >> the williams family how have they helped you in your journey. >> his girls as they started to break down a lot of barriers inspired me to kinda say, "okay. if-- if the opportunity comes even though i wasn't sure she was gonna play tennis but if the opportunity comes, this is kind of what you need to do." >> it may have been inevitable that coco became a sports star both her parents were college athletes. >> candi ran track and field, and corey played basketball. >> no. they always fight over who -- like, gave me the gifts, i guess. so, like, my dad says i got the height from him. my mom says i got the legs from her and the speed from her. but then he argues that the speed is from him. so-- >> it goes back and forth. >> yeah. but it-- >> well, i think the thing is-- i think-- obviously, she's more accomplished than we are at this point. as former athletes, you know, you look at the things that you coulda did better and-- and i think that's why she's able to be successful 'cause we always tried to give her the very best

that we can afford or had time for at the time so that, you know, if she decided not to play again, fine. we'd be satisfied that we did our very best to give her the best opportunity to be successful. >> it's not just coco's parents who have supported her. her grandmother yvonne, a stage four lung cancer thriver, has been an endless source of inspiration. >> i think it taught us a lot that you can be going through a lot and going through some of the worse times. but you remain happy and a belief-- believer of god. and anything's possible. >> yeah. you got a beautiful family. you know that, coco. >> well, i have a beautiful granddaughter. but she's still gotta clean her room. >> well, i'm gonna go check out that room. i hope you cleaned it. >> after doing a quick sweep of her room i can tell you, it is clean -- sprinkled here and there with precious memorabilia. the plan worked -- just by looking in coco's room, you can see some of the proudest moments in her life. including a signed book from michelle obama, a fan since coco's stunning performance at wimbledon. including a signed book from michelle obama, a fan since coco's stunning performance at wimbledon -- coco met the former first lady earlier this month. >> okay. you met michelle obama. who's next on your list you

wanna meet? >> beyoncé. >> go-to mus >> icon by jaden. yeah. >> favorite meal after a big match. >> pasta or a burger. yeah. sometimes -- it's easy to forget that coco is still just 15. but as the us open looms just around the corner, all eyes will around the corner, all eyes will be on the young athlete to see what she accomplishes next. >> so what are your dreams? and what are you doing to focus on the small things to get there? >> for me, my-- well, my tennis dream, i guess, is to be the greatest of all time. but-- my dad always told me that ever since i was a little girl that one day i will change the world with my racket. so i hope that one day i can do that. and i'm already thinking of ideas on how i can. >> our thanks to robin. next, el paso strong -- the community giving back to one man who lost so much. how do you gauge the greatness of an suv? is it to carry cargo or to carry on a legacy? its show of strength or its sign of intelligence?

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>> finally, stepping up for one of their own. when antonio basco lost his wife in the el paso mass shooting. hundreds of ordinary citizens showed up for her services. after basco feared -- without any relatives -- no one would

attend her funeral. now, the community opening its heart again -- a car dealership gifting him a new suv after word got out that his vehicle had been stolen and vandalized. el paso showing once again -- antonio will never be alone -- because they're in it together. el paso strong. that's nightline. you can always catch our full episodes on hulu. thanks for the company, america. good night.

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