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Tonight south of barcelona, Police Killed another group of alleged terrorists in what theyre calling a related attack. The barcelona attack began just before 5 00 p. M. On las ramblas in the heart of barcelona. It happened in an instant. This white van driving on the road. Its difficult to explain. Reporter the van mowing down pedestrians at what witnesses guessed was 50 Miles Per Hour. When i saw it, he was traveling at high speed, knocking people into the air. Translator i saw a ton of people screaming. You could hear the van, seeing all the bodies there by las ramblas, i dont know, it was horrific. Reporter the van careening down this path in red for more than 1,000 feet before coming to a halt, the front of the van smashed. We are right where the van mounted the sidewalk. You can see debris on the floor, discarded clothes. It came up here all the way down this street. People taking shelter, running into stores and restaurants. This woman and her family found sanctuary in a shoe store. I saw people running, and we stay in this store and dont leave. Reporter these people from connecticut arrived only today. They were left on lockdown in their hotel with no information for hours. So you were in your hotel when you heard a commotion outside . Correct. We heard there was a van that plowed into pedestrians down hi here with some injuries and thats how it started. We were not allowed to go out of the hotel. They closed the doors. Reporter so the police came into the hotel and closed it down. Asked the manager not to let anyone to go out. Reporter what were you feeling at that point . Scared. It was scary, not to know whats happening and just seeing people running outside. Reporter police on foot, guns drawn. Combing the streets in search of the assailants. Translator this is clearly a terrorist attack, intended to kill as many people as possible. Reporter tonight police calling this 28yearold moroccan driss one of the terrorists. He recently arrived in spain last sunday and rented the van used in the attack. He was not behind the wheel today. Oukabir is now in custody along with another suspect. And a third man was shot and killed after running a police roadblock. Oukabirs Facebook Page shows him resting on the beach, listening to rap music. But he recently shared this antisemitic video whom he described as true heroes. Reporter normally this is bustling on a summer night. Now its virtually shut down, the only thing, security vehicles and their personnel. It comes straight out of an isis playbook. The group has urged followers to carry out similar attacks. Even detailing the type of truck to use. We can only expect to see more attacks. If you think about that its so easy to do. The world is basically a soft target. You need no training. You need no equipment. You just need somebody whos got the wherewithal ability to pull off these horrible acts. Reporter todays attack once again a reminder of a troubling new reality for cities across europe. Im from london. I know weve had problems. Any western city is a target. Especially tourist areas. Not a complete surprise. Reporter the images stirring up dark memories of similar carnage. Vehicles to create mass destruction. Bastille day, in nice france. 86 dead, over 150 more injured when a cargo truck plowed through a crowded promenade. Theres another sound, shooting in the air. Reporter less than six months later in germany. As many were finishing up their holiday shopping, a delivery truck barrelled through a berlin christmas market. It came through the entrance, hit the sides of the barriers and carried on past us. Reporter 12 dead and over 50 more hurt. And this year, two attacks in london. In march, a driver struck down pedestrians on westminster bridge, killing five and injuring at least 29 people. Then this summer. Get moving reporter on london bridge, a van plowed into pedestrians. Three attackers jumped out of vehicle, stabbing people indiscriminately at a near by market. The idea that you could drive a car, 20, 30, 40 Miles Per Hour into a very denselypopulated area. Youre going to harm or kill a number of people by the sheer force of what youre hitting them with. And so i think that its a horrific crime. But its also, if youre one of these people with such a sick bent, its just too easy to do. Reporter in the u. S. , authorities are concerned about how easily a large truck could become a killing machine. The problem with that is you have all those businesses, restaurants, et cetera, that need deliveries. So how do you get vehicles to these locations . It becomes sort of a logistical nightmare in trying to shut down streets. Reporter in may, the tsa released a report on the threat of vehicle ramming attacks in the u. S. , recommending reporting to authorities any suspicions arising from the rental of largecapacity vehicles near large gatherings and creating barriers that create a serpentine path of entry. And it was just this past weekend when a car driven by a White Nationalist plowed into a group in charlottesville, killing Heather Heyer and injuring at least 19 others. The car just plowed through hundreds of people downtown charlottesville. Reporter meanwhile, cities across the u. S. Have doubled down on their security efforts. And officials wasted little time in condipping this latest attack. President trump tweeting, the United States condemned the terror attack in barcelona, spain and will do whatever is necessary to help. Terrorists around the world should know the United States and our allies are resolved to find you and bring you to justice. Reporter that message echoed by the spanish prime minister. [ speaking in Foreign Language ] reporter but the words of politicians dont hide the fact that as isis strongholds in the middle east crumble, attacks on soft targets in the west are increasing with more innocent civilians caught no tin the crossfire. Tune in to gma tomorrow for the latest on the unfolding events in spain. And next on night line, something entirely different. Extreme athletes plunging into icy waters and living to tell the story. How they pull it off. Isease. Youre a life of unpredictable symptoms. Crohns, youve tried to own us. But now its our turn to take control with stelara® stelara® works differently for adults with moderately to severely active crohns disease. Studies showed relief and remission, with dosing every 8 weeks. Stelara® may lower the ability of your immune system to fight infections and may increase your risk of infections and cancer. Some serious infections require hospitalization. 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If your body isnt perfectly positioned you can suffer from concussion, spinal injury or death. So why do it . We followed some athletes to ireland to find out. Heres gloria river ear yea. Reporter at the extreme edges of the world, jagged cliffs meet churning sea. They call this the serpents layer in ireland where galeforce winds can scream over icy waters. So cold. Reporter only the most intrepid dare it all for that perfect dive. David couturi is one of them. A little over on the entry. Its always the most nervewracking. Reporter this is the red bull cliff diving world series. 22 athletes, six events and one way out. A 90foot plunge into frigid darkness. Davids journey began on another coast. Training for months in california. Two, three. Reporter the grueling physical demands on a diver have dominated his life since he was a little boy. Now his own body can meet a challenge. David is fighting back from a shoulder injury that stole last season from him. It was long and tough and nervewracking and mentally strenuous. Its been a long recovery road. Reporter across the country in indiana, a different challenge for a gymnast turned diver. Im excited. Im hoping this will be my year. Reporter Cecily Carlson will be one of the first women allowed to compete at the serpents layer. Lair. If even one thing goes wrong, that can be a big setback. Reporter weve come all the way to dublin, a three hour drive, and now its amazing. We made it to the gaelic town, but we missed the last ferry lucky for us, there is a fishing boat. More than 24 hours of travel later we are there in the dead of night, the serpent sleeping in his lair until dawn. Just after daybreak, we meet up with david. Feels like we are at the edge of the world. Yeah. Its a very cool spot. Reporter limestone terraces twist under foot until suddenly, a perfect rectangle is revealed at low tide. No way, that is crazy. How does a kid from toledo become a global cliff diver . My dad says he dropped me on my hid too many times as a kid. Thats where the downward spiral started at a young age. Reporter dreaming of olympic gold, narrowly missing the 2008 team. You are coming back from a big injury. The toughest injury ive ever had. I tore my super sene dus. Reporter when you look at this, what are the dangers . Hypothetically, the consequences are severe. The speeds that we hit going almost 90 kilometers per hour, 57 Miles Per Hour, hitting that water. You hear the analogy of hitting concrete. Its hard. Were talk torn muscles and ligaments. It can be loss of conscious nurks punctured lungs, internal hemorrhaging. The margin of error is extremely small. Reporter such an extreme sport. People point us out as adrenaline junkies. But these are very, very calculated risk takers. Youre not just going up there and chuckin stuff. Thats how you dont make it to the next jump. Definitely a little nervous but excited as well. Reporter its time for his first practice dive. Its been a long buildup to this. Reporter when these divers hit the water, theyre no less than four safety divers on hand if anything goes wrong. How was it . It looked good. It looked good from where i was sitting, it looked good. How did it feel . It was fine. A little over on the entry. Reporter his second dive. Woo reporter lets see that again. Two summer saults and a half twist, hitting the water at 53 Miles Per Hour. The impact on their body too much for a headfirst entry. Every dive you go on a rollercoaster from terrified to overjoyed. Mmhm. Reporter this is what you do, and yet every time before a dive theres that little hint of fear . Absolutely. It can start weeks before you come. It comes as soon as you touchdown. It starts when you wake up in the morning. It definitely hits when you step on that platform. Reporter all the athletes say they feel it. Youve got the wind. Youve got the rain. Its cold here. A horizon of water thats endless. And youre looking at it, hoping that what you see still what you see in a dive. Hopefully it doesnt change. Reporter its time. I think that once the first dive goes in, then, in all, ill be able to calm down a little bit. Reporter the risk taking is a big attraction for locals. Game time. Reporter olympic diving champion Greg Lougainis says this is the tricks theyre doing. The element of difficulty and, you know, its just amazing what theyre doing. So theyre progressing in the sport. Reporter he says precision is key to getting high marks. Youre looking at the takeoff, strong takeoff, the flight in the air, you know, that its smooth and graceful. And entry into the water. Reporter first the men. David hideads up for his first dive. Not a bad start. Ill take it. Even half. Yeah. Pretty good. Youre always looking for those nines and tens, but in these conditions, first event of the year, well start with that one. Reporter now the women. Cecily claiming seventh. Im proud of myself for getting out there. I really did want to do t so, its cold. Reporter davids final dive, threesom three somersaults. Finish being finishing in fifth place. But being here is a win. It transferred from traditional diving to now cliff diving. For now its the wild west and were forging our own path. Reporter for nightline, in ireland. At least it wasnt a fastball. The wild first pitch that had all the men in fenway park groaning. Sy. Its a longdistance run. And you have the determination to keep going. Humira has a proven track record of being prescribed for nearly 10 years. Humira works inside the body to target and help block a specific source of inflammation that contributes to symptoms. In clinical trials, most adults taking humira were clear or almost clear and many saw 75 and even 90 clearance in just four months. Humira can lower your ability to fight infections, including tuberculosis. 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I knew that not the one you think you know the tri action formula cleans removing up to 100 of flakes protects and even moisturizes for Sofia Vergara hair and finally tonight, an epic and painful end to a firsttime pitch. First time pitches can be painful, remember mariah carey . Or fitty cents attempt. Just a bit outside. But none of them quite as uncomfortable as this one. Cancer survivor and red sox fan, jordan lee andrei tossing out the first pitch, hitting a photographer well outside the strike zone, the famed cameraman catching this shot right before impact. As we know, theres no crying in baseball. The photographer bounced right back, even taking a picture with lee andre after the game. Hard to watch, but thank you for watching abc news tonight. As always, were online 24 7 at abc news. Com and on our nightline footba nightline Facebook Page. Thank you for watching. Hey, everybody, its bachelor Fan Favorites week. Each day, some of the great people ive gotten to know on the bachelor and the bachelorette are here playing for charity, and they are on the prowl. For 1 million, that is. So lets play who wants to be a millionaire. [dramatic music] hey, everybody. Its bachelor Fan Favorites week here on who wants to be a millionaire. [cheers and applause] good to have you. Todays bachelor fan favorite didnt find love on the bachelor or bachelor in paradise, so shes hoping there will be a happier ending today. From sacramento, california, please welcome clare crawley. [cheers and applause] how you doing, girl . Hello. [cheers and applause] good to have you here on millionaire. Im so excited to be here. Good to be away from the roses, away from the beaches. Yes. Away from the raccoons. You want to talk pressure. [chuckles] go on the bachelor. Right . Yeah. People dont understand. There is a lot of pressure on that show. I know it just seems like were traveling around the world, you know, sipping mimosas and sitting around in our robes, but theres more to it than that. Absolutely. Absolutely. Um, but im there to help from time to time. You actually were so helpful, to me, especially, i think. cause we did have a moment. We had a moment in new zealand. cause you were on juan pablos season, which i i can apologize for now. [laughter] um. Who knew . But, yes, therey a