the car jacking at a popular american vacation destination. the crowded hotel and the families watching it all. good evening and it's great to have you with us here on a friday night. we begin with a gridlock at america's airports this friday. a worker at the air traffic controller offense pouring gasoline on a computer. triggering a chaotic scene at two chicago airports and traveling across the country. and look at this, the planes in the air. and much of the day, right there in the middle, empty skies. more than 2,000 flights canceled. and at the airport, a young mother holding her head. airline employees handing out water. and look at this video inside one of the terminals in chicago. lines as far as the eyes can see. david kerley on why it happened and how it quickly spread across the country. >> reporter: chicago's two airports critical hubs in the middle of the country, grounded by one man and some gasoline. >> it's very frustrating to arrive to this chaos. >> reporter: thousands of fliers from coast to coast, lined up with nowhere to go. the message, canceled. look at this man's face. the cause? a contractor at this air control center outside of chicago reportedly putting gasoline on the basement communication computers and lit it. and when firefighters arrived, they found the man, disgruntled at work with multiple self-inflicted stab wounds. >> he was lying on the ground. there was some degree of effort on this part to drag him out of the building. >> reporter: but the fire caused damage. the workers couldn't get the information they needed. two properly communicate with jets. so the airports went on hold. no one getting in or out of chicago. and planes forced to go around the air space. how does one person bring so much of the air traffic control system down? >> he knew where to go and what to do in and i'm not sure how you guard against that, somebody who is already authorized to be there. >> reporter: indianapolis controllers took over for the chicago air space. but the damage so bad in chicago, flight plans had to be input by hand. by the afternoon, planes were going in and out but at a severely reduced rate. just tonight, faa officials are getting a first look at the extent of the damage inside the computers. which means the e lays and cancellations will spread into the weekend. and david, it could even go to next week. >> david kerley, thank you. to the other air scare. two passenger planes not able to land at an airport in wilmington, north carolina, overnight. someone shut down the runway lights too earl. human error was to blame. we do know they are paving runways. authorities don't know who made the mistake. and the development in the sweeping arrests in the fight against isis. britain, denmark, belgium joining the fight. and these pictures coming in this evening from spain. you can see authorities leading this man away in handcuffs. and tonight, martha raddatz on an america battleship in the gulf, right there with the teams prepping the precision guided bombs on the deck. witnessing the landings on the carrier every 55 seconds. martha just reporting in. >> reporter: every bomb dropped on isis from the navy, every missile strike from the sea has originated from this aircraft carrier and the ships around it. dozens of f-18 fighter jets. loaded with precision guided bombs. and hundreds of them, each bomb able to handle a deck. the deck of an aircraft carrier is busy ever day. but on this campaign, it's been intense. which means 80/40 every day. takeoffs and landings. and the landings we want are coming every 55 seconds. slamming on to the deck. from 155 miles an hour to a dead stop in three seconds. at night, things get more difficult. we watched the fighter jets returning from long combat missions overnight in syria and iraq. some unable to catch the wire, bolters they are called, forced to immediately take off. for a second try. the night operations are so hard. >> they are. flying at night and long hours. >> reporter: and many long hour, long months to come. martha raddatz, abc news, aboard the "uss bush" in the gulf. and now, a troubling headline in the heart land. what played out in the workplace. a fired worker accused of an unthinkable act. showing up at work and targeting his colleagues. tonight, the 911 call. pierre thomas on the case. and questions about whether this man was an isis sympathizer. >> what is your emergency? >> reporter: a 911 call from inside an oklahoma food processing plant, witnessing the unthinkable. >> we have someone in the building. attacking someone. we hear a lot of screaming. >> reporter: police say that he was nolan, a vaughn foods employee, who was just fired and on a rampage. >> lock that door. >> reporter: police said he killed colleen in barbaric fashion and beheaded her. >> he began assaulting her with the same weapon. >> reporter: the horror did not end until executive mark vaughn confronted him with a gun. >> that's a gunshot. >> how many more shots have you heard? >> we heard three. >> you heard three shots. >> reporter: and police credit mark vaughn with stopping more blood sed. >> he didn't stop until he was shot. >> reporter: he was wounded by the shots and arrested. >> due to the manner of death, we request the assistance of the fbi. >> reporter: police said he was recently trying to convert his co-workers to islam. sources tell abc news they are investigating if he was posting a series of jihadi rants on facebook. and if he was influenced by the recent isis beheadings dominating the news. sources say his primary motivation appears to be workplace anger. but tonight, officials are taking no chances, launching a full scale investigation into his associations. david? >> pierre, thank you. we are learning much more tonight about one of america's most wanted. the survivalist accused of ambushing state troopers, killing a young father. tonight what authorities have discovered on a hard drive, a computer. what they think he was searching. and a phone call made to his parents? linzi janis has more important. >> reporter: please are searching this resort. scouring it room by room. they say eric frein had been there before and may go there again. >> eric, you are a coward. we are not intimidated. we will not leave. >> reporter: authorities with a search of a computer hard drive, proving he had prepared for this moment for years. >> the search of the hard drive indicates extensive internet research on how to avoid police man hunts. >> erin: also tonight, frein may have made a critical mistake, trying to call his family. his cell phone signal allowing police to narrow the search zone. they think he traveled and is now hiding out in the five-square mile terrain in dense woodlands. we spoke with melissa frein married to his brother. are you cooperating? >> absolutely. we are praying that he surrenders and nobody else gets hurt. >> reporter: local residents growing increasingly frustrated. joyce says she won't go outside without her gun. have you thought about what you would do if you see him in your backyard? >> i don't think he stands a chance if he comes in my backyard. >> reporter: david, police now say frein was experimenting with explosives. searchers now on the look out for booby traps. david? >> thank you. we are going to town to the weather headline. this is downtown phoenix. this is a haboob moving in. the weather in the southwest, powerful storms, flash floods and now the tornado. and look at the weather wall, the bull's-eye in the southwest as we start this weekend. let's get to to meteorologist rob marciano. you were telling me about the winds kicking up the storm. >> we had a report of wind 50 miles an hour and you have the dust and the sand mixing in. very dangerous and low visibility. this is a storm system closer to october, the system will move off to the east. and the severe system will be in so cal, and vegas. maybe up to salt lake city. and strong winds and dust storms and maybe a brief tornado. and it's going to be a slow mover so flooding rains for places that don't need water. from phoenix, up to the northern spine of the rocky mountains, colorado and wyoming. and flash flood watches tonight and will last through the weekend in excess of three inches of rain or more. >> rob, thank you. now to the virus striking children sending families to the er across the country. spreading fast. and to the map tonight. more than three weeks ago, 11 states affected. one week later, 27 states and tonight, 45 states with confirmed or suspended cases. and now word, a 4-year-old has died. investigators asking, was this mysterious virus to blame? alex perez now. >> reporter: in new jersey tonight, authorities working to figure out if the death of a 4-year-old boy suffering from respiratory illness may be linked to enterovirus. ordering the boy's preschool classroom to be sanitized. if confirmed, it would be the first death from a rare strain of the virus that has sent hundreds of children to hospitals across the country. the virus, dangerous for kids like emani torres, who suffers from asthma. >> whenever i do my asthma treatment, it really works right away but it wasn't working this time. >> reporter: in the last month, more than 3,600 children treated for enterovirus-like symptoms at facilities in colorado. during the same time, one chicago hospital three times had to divert ambulances to other hospitals because its emergency room was jam packed with sick kids. the virus is treated much like a cold, allowed to run its course. if you're children is having trouble breathing, you should get them to a doctor. >> yeah, you should right away. >> reporter: because the testing takes time, the number of cases could keep growing as the results come in. as simpb simple as it sounds, the best way to keep the virus from spreading? wash your hands. david? >> alex, thank you. we are going to turn now to the slender man case that has shocked parents across the country and across the world. two 12-year-old girls stabbing their friend 19 times leaving her in the woods to die. and she crawled out. and survived with the help from a hero who discovered here. tonight, right here, you meet that hero. it's a friday night in washington. and the mother and father are sending their daughter to a sleep over. and they know her friend well, morgan geiser, celebrating her birthday. it was a friday night? >> yeah, it was a friday night. >> and had she gone on sleep overs before? >> yeah, they talked about it for weeks. >> they were going roller skating, to have pizza and spend the night at her best friend's house. >> yeah, and they were going to watch a movie. she had absolutely no idea. >> no, she was blind sided. >> it was unthinkable. the first moment anyone would begin to learn of the horror was this call to 911. listen, the operator was not believe who they are hearing. >> i have a 12-year-old female, she appears to be stabbed. >> what? >> stabbed. >> stabbed? >> right. >> greg was riding his bike that morning on a path that had actually been chained off. it was pure chance that he came this way. >> are you with her right now? >> yes. >> is she awake? >> she's awake. >> is there any bleeding going on? >> her clothing has blood on it. >> and you find her. she was just laying there? >> yeah. >> can you help me please? i have been stabbed multiple times. and i got out my cell phone and i was shaking and i dialed 911. and i stayed with the 911 operator. and i offered her water. because i had a water bolt bottle on my bike. the only thing she said, she was having trouble breathing. >> we were on the journey with the family, grateful to every single person along the way who helped save their daughter. hugging the man who found her. and tonight, you will meet the 12-year-old girl. her smile has finally begun to return. she takes us to her favorite place in the world and one triumph. an entire community was hoping for. >> it's been a journey. later tonight on "20/20," why did the girls do it? what they told police. trying to impress a fictional character on the internet. walking to a mansion in the woods that did not exist. a special "20/20" out of the woods 10:00 eastern. and you will meet that brave 12-year-old smiling again. in the meantime, there is more ahead on "world news" tonight on this friday. and take a look at this, surveillance video from a popular vacation destination. the suv car jacked in front of the hotel. the driver slamming into everything. the families watching it all. >> and tonight, the mailman charged. tens of thousands of pieces of mail he did not deliver. hoarding them instead. how did they catch him? and the george clooney news from venice. and the word on the boat that says it all. back in a moment. i-s-a and i ha but i don't want my breathing problems to get in the way of hosting my book club. that's why i asked my doctor about b-r-e-o. once-daily breo ellipta helps increase airflow from the lungs for a full 24 hours. and breo helps reduce symptom flare-ups that last several days and require oral steroids, antibiotics, or hospital stay. breo is not for asthma. breo contains a type of medicine that increases risk of death in people with asthma. it is not known if this risk is increased in copd. breo won't replace rescue inhalers for sudden copd symptoms and should not be used more than once a day. breo may increase your risk of pneumonia, thrush, osteoporosis, and some eye problems. tell your doctor if you have a heart condition or high blood pressure before taking breo. ask your doctor about b-r-e-o for copd. first prescription free at mybreo.com [ male announcer ] with nearly 7 million investors... oh hey, neill, how are you? 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