how is it possible that young americans straight off the football field could join forces with isis? >> how did you feel about the beheadings? you knew they are a savage organization. >> in a week with another terror attack how could so many different kinds of people be lured in? >> they were that good online. >> if you have a machine, any child is vulnerable. >> tonight a year long investigation. >> they just posted this now. >> about five minutes ago. >> a marine who turned in his own son. terrorism experts. isis converts. >> i want to be remembered. >> is this the new world war? the only battle for millions of hearts and minds. >> if they can reach the two of

you, where is it going to stop? >> diane sawyer investigate isis in america. >> reporter: this week in america, a 29-year-old man who had emigrated to this country seven years ago takes a truck and mows down more than 20 people on a bike lane. on his phone, 90 isis propaganda videos. and it seems for years now, we have been talking about men like this. their terror. radical jihad. extreme. >> but tonight we are tracking something different. trying to learn ow isis is now reaching into all kinds of american homes. muslim, non-muslim. how did they recruit an american cheerleader and honor student? a high school wrestler. the son of hard working catholic cuban immigrants. >> the challenge is not just finding needles in a haystack

but figuring out which pieces of hay might become a needle. >> the former director of the fbi. >> which of the young people are moving towards an act of violence like a stable ll lbing shopping mall. >> even when the troops lose battle the terrorists are winning a different kind of war. for a year now we have been seeking an answer to an urgent question. what does isis do that recruits americans rite here at home and who are the people who sign on? also, how do we fight back when they can secretly make contact through something right in our pockets, our phones. counterterrorism experts in this country have been trying to sound the alarm. >> this is going to be a fight. >> this is the national security challenge of the 21st century. >> the threat has metastasized. >> reporter: in america tonight there are 1,000 terror investigations under way

reaching across every single state of the union and 40% of those charged in supporting isis terrorism. did not grow up muslim. which brings us to the young man who lived here in rural north carolina. >> your emergency? >> a desperate father calls 911 about his son burning religious statues in their home. >> i need somebody as quick as possible. >> we have units en route to you. >> i don't know if it's isis or what. >> this is your son? >> yes. >> you can hear that son in the background. >> you're going to throw me in jail and kill me. >> a terrorist, just sullivan grew up in a catholic home with a bedroom filled with child toys. his dad. >> i imagined him joining the military. and to follow in my footsteps.

>> reporter: but his high school reported to the parents that justin had violent fantasies in his writing and suspended him. they said he needed serious help. the parents sent him to a psychologist but admit they downplayed what they were hearing. as justin continued to isolate himself on his computer, obsessed with violent video games and images of isis. >> isis soldiers, they would wear their socks above their ankles. >> he started doing that himself. >> reporter: the parents had no idea that their 18 year old son alone with his his computer had reached out to isis recruiters. he sent a message. in less than 24 hours, a top captain of isis responded. 6,184 miles away. isis recruiters seem to know exactly what to say to weaponize someone like justin. there is even a captured terrorism recruiting manual. in phrases from other isis cases we can see step one. if the target is alienated,

like justin, start with encouragement and praise. mike welcome brother. blessings upon you. feel free to ask me anything you want. isis recruiters use emojis. justin is lonely. isis can fix that with women. we know he loves the video game call of duty. isis has an idea, call of jihad. the recruiters tell justin there is something he can do to be a real action hero, a celebrity. one night in december 2014 of what seems to be a practice run, justin sullivan puts on a ski mask and murders a neighbor with his father's rifle which he hides. police find the neighbor's body but have no suspect and then in a few months he tells his isis recruiter he's ready to go big.

isis says make a videotape so they can be sure he's famous. he's going to get an assault rifle and slaughter people at a concert in north carolina or at a club, hundreds will die. he buys a ticket to a gun show. days away from attack but as the clock is ticking down, his parents discover a package containing a gun silencer and for the second time the father makes a desperate call for help. >> i called the police department and said i need to talk to somebody in homeland security. >> captain sullivan discovers the fbi was secretly tracking his son because of that first call to 911. agents arrest justin. he pleads guilty to terrorism and to the neighbor's murder. his defense attorney argues justin is clearly mentally ill as he begins serving his two life sentences. he has never talked about why he was trying to become a soldier

of isis, terrorists halfway around the world. >> hello, this is a prepaid collect call from -- >> justin sullivan. >> an inmate at the county detention center. >> he says isis gave him a place to belong. >> i thought it was like a brotherhood. >> and his fantasies of hero imfrom the violent video game have become reality. >> like revenge and you want to be acknowledged by islamic state. you want to be looked at as like a hero. >> the rambling conversation includes his anger at drone strikes. >> they civilians. >> and chlaims wouldn't have goe through with the attack but wonder is he sorry for what he did. >> i got two life sentences. who is saying sorry to me. >> this is mary mccord, the former head of the federal office that has prosecuted all

147 isis cases in the u.s. in the last 2 1/2 years. including the case of justin sullivan. she says his obsessions were not about politics or radical islam. >> i don't think justin cared anything about the religion. he thought this was a death call to acquire weapons and killing as many people as he could. that's all he wanted to do. >> mccord says it might surprise you how many of the cases her office has prosecuted have little to do with twisted religious beliefs, more to do with young men and 89% are male just feeling powerless. >> some have mental health problems and some drug problems. some have criminal history. >> john miller, deputy commissioner of intelligence for the new york city police department says isis recruiters online know their targets well. >> what is the void? where is the hole in this

person's life? how do we fill that piece and bring them onboard? >> one of their video promises no more humiliation. >> they say, you know, you can go from whatever you are, maybe you're a loser, to being a lion. and all you have to do is follow this code. they put together a menu of messages. that promise valor and belonging and empowerment. >> tonight a father from north carolina has a warning for parents, remember, he is a marine who fought the enemy abroad. >> here i am defending our country against domestic enemies which so happened to be my son. i didn't think it would get this close to home. >> a father, a wash and regret. >> and we failed. you know.

>> announcer: next, how does isis recruit young women? the romance of jihad. >> did you think you were going to marry some of their soldiers?

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>> reporter: in the america's suburban world of pizza and friday night lights, three years ago there was a teenager who was smart, very pretty, and says she loved her lip gloss, her iphone and beyonce. ♪ >> reporter: she was just a young child when her dad moved his family to america for the freedom and opportunity. but she says when she began to reach her teens she got confused. she says she wanted to be a

modest, respected muslim girl but was also drawn to the free-spirited secular culture all around her. she says it made her curious to learn more about her religion. she decided to go online and ask for some advice. in a flash. someone wrote back. it was isis. >> reporter: how long was it? >> rapid fast. >> reporter: almost instantly. >> yes. >> reporter: this young woman agreed to talk because she wants to help others. but because of the risk of going public we agreed not to show her face and someone else is speaking the exact words she said. >> we're okay? she tells us after she went online, isis recruiters immediately began bombarding her with more than 8,000 exchanges on social media sites and encrypted apps. the recruiters have a special approach for girls. starting with friendly conversations about girls

fro -- growing up, happiness. she shares some typical teenage complaints about her parents. >> yeah, all of it was childish in a way, yeah. >> reporter: the recruiters sense an opening. moving in to distance her from her family. they say she must feel alone and like no one understands her. >> the way they phrased things made it feel like we didn't belong here. like, "they're not like you. they're americans and you're not." >> reporter: for months, she will spend more and more time on the phone and her computer with her new isis friends. they reinforce her idealism with videos like these. isis fighters giving out cotton candy, they have kittens with their guns. patiently immersing her in the fiction of an isis utopia, where everyone seems to be helping each other. >> kids were, like, laughing and smiling and, like, having a really good time. and people praying and just really living life. >> reporter: the young girl's parents have no idea that their daughter is online with isis recruiters nor that she is about

to cross a threshold. the recruiters tell her, "come and be with us." they tell her girls like her don't even need to bring soap or shampoo, there's plenty there. and look who's waiting to welcome them. passionate, devoted men, ready to fall in love for life. did you think you were going to marry some of their soldiers? >> maybe, yeah. >> reporter: but we wondered, how could this smart girl not know about the real videos of the real isis? where independent women are treated brutally and beaten? she tries to explain to me that kids of her generation are constantly steeped in so much conflicting information online they don't really question whether an intensing picture is true. >> they desensitized us in a way. >> reporter: like, a brainwashing? >> yes. it's almost like being h captive. >> reporter: so one day, the teenager sneaks off to the airport and the unknown. she's following instructions

from her isis travel agents. she buys a plane ticket to a country in europe, then a connecting flight to the syrian border. she's told by recruiters which bus will take her across the border and she has a telephone number to call on arrival. but back at home at 10:00 a.m. one phone call from that daughter's school changes everything. the father is told she is not in class. he begins a frantic search. he also learns of a tweet in which his daughter asks for prayers for her. >> i discovered that her passport is gone. >> reporter: he logs into their shared phone account, and sees she dialed a taxi, finds the driver who says he took her to the airport we're not showing you the real one. but which plane? when he tries to text her, there's only silence. >> i turned my phone off. just didn't wanna see their phone calls, their messages or anything. >> reporter: were you aching that you might never see your family again? >> yes. but at the same time. like, "they said it's worth it.

it's -- it's okay. you're gonna end up in heaven. you're fine." >> ladies and gentlemen, we do appreciate your attention to safety, flight attendants will now be coming through the aisles making their final safety checks. >> reporter: the plane is taking off as the frantic father calls everyone he can think of. >> yeah, i really cried at that parking lot. i just feel there is something unusual, something scary is about to happen. and i just feel helpless. >> reporter: he also manages to reach out to the fbi. and just in the nick of time, when the plane lands in europe, fbi agents deploy to the gate and intercept that girl about to enter a kind of hell. when she came back home, she was put in a juvenile program that included therapy. and now she's back in school horrified that she was ever so naïve. >> i find myself thinking about it sometimes. like, "you changed your whole life in a matter of months because someone told you you're going to heaven." that sounds crazy to me.

heaven in the video online, when this is the truth of the wreckage where isis once ruled. >> reporter: we traveled to the middle east to talk to two isis women who were among the few who managed to get out. this one a former commander in isis's all female morality police force. the kind of woman who might have been waiting for that american teenager if she'd made it. the woman who fled says that teenager would have been trapped. >> we take everything from them. all their smart phones. they should not now communicate or talk or give information to anybody. >> reporter: she says hundreds of young foreign women were lured into isis online and never told the truth. >> translator: the days of terror that i witnessed with my own eyes, the brutal punishments, the corpses in the streets, until now my whole body shivers. what i want to forget, i cannot forget. >> reporter: this other woman

who escaped also used to be part of the morality police force and helped arrest girls who violated isis codes. she says it was so frightening there, she has no choice. >> there were killings, cutting off heads and leaving heads in the streets. they would whip the elderly in the street for silly, negligible, inconsequential reasons or cut off hands. at the end, it was all terror. >> reporter: and back here in america, in a state in the south, there is another father who knows that is true. his family, upper middle class, his children born in this country and they seemed to love it, including his daughter. >> she's really, was an american. american way. they are very well-behaved and they are really smart and they are really nice. >> reporter: he says he was actually proud when his daughter was becoming more devout about religion, no idea she was secretly taking her cues from isis recruiters who were sending

her messages on her phone. this dad did not make it to the airport in time. she has now married into isis and in march sending a photo aiming a gun at the camera urging people on twitter to drive over veterans, patriots, memorial day parades, kill them she says. then a message, a kind of invitation. chocolate pancakes in jihad. her father says he hopes to save another family his pain. >> i never thought in my life -- i'm sorry. i, i never thought in my life that it would happen to us, to me, to my family, but it happened to my family, it could happen to any other family.

>> announcer: next she was a cheerleader. he was the straight a student she met at mississippi state. so why did they try to leave their lives to serve isis? we head behind bars for answers. >> it made sense to you? ♪ you are my best friend ♪ and we've got some things to do ♪ ♪ ♪ do you wanna, do you wanna, do you wanna ♪ ♪ do you wanna, do you wanna, do you wanna ♪ ♪ ♪ yeah-ea-ea-eah ♪ a silicon valley server farm. the vault to man's greatest wonders... selfies, cat videos and winking emojis. speaking of tech wonders, with the geico app you can get roadside assistance, digital id cards... or even file a claim. do that..

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america law enforcement is standing watch to thwart terrorism plots. in new york hundreds of surveillance cameras in times square alone. officers not only with weapons, but radiation detectors too. >> how many radiation detectors? >> thousands. police officers wear on their belt that looks like a pager, radiation detection boats circling the ships as they come in. the radiation detection on aircraft. >> so that's every flight coming in and out of new york city. >> reporter: john miller deputy commissioner of intelligence and counterterrorism says there are also biological detectors. >> biowatch sampling the air and growing our cultures every day to see is there anthrax? >> reporter: but underneath everything we are watching, is there something we cannot see. beneath the cyber world we

navigate a hidden swamp of hatred of all kinds. the encrypted web, which has legions of sites gathering places stoking anger. you can choose down one corridor racism. >> here's some reality. 74% of the extremist-related killings in this country in the past 10 years have been carried out by right-wing extremists. perspective from oren segal, director of the center for extremism at the anti-defamation league. down another corridor he says, jihadist terror. >> 24% by those who are motivated by radical interpretations of islam. >> reporter: and in this corridor we can see phrases from the koran their meaning twisted to serve a group of killers. there are also sites detailing how to be most effective when wielding knives or a truck against innocent people, including muslims. and most parents don't know that for kids all this is just a few clicks away.

most parents don't know. >> uh in the past 3 ½ months, we're on now 450 plus isis telegram channels that have some level of english language content on it. >> they have a entire chat room-- to give you-- information on how to protect your computer from surveillance and the fbi. >> reporter: seamus hughes of george washington university leads a program and a group that tracks and analyzes extremists online. >> they just posted this, right now -- >> they just posted this about five minutes ago. >> reporter: he says they're fast and up to date. rising out of the swamp to exploit trending topics it's called #hijacking. this summer when we were all weighing in on game of thrones. so did isis supporters. one click taking you to an isis beheading that says "then, they will be overcome." >> reporter: this is haroon ullah senior advisor to the state department and has writt a book as a wakeup call.

>> this is a battle we saw coming and weren't prepared for. >> they're still online every day? >> every day. >> working it every day? >> yeah and i check it almost every day. they know how to fail fast. so they work on it, you know, they see what works and see if it doesn't work, they change it up. they have a "game of thrones" kind of documentary/drama. they have music. doing stuff visually entertaining and that's content war. >> so we ask him about online recruiting and the fact that 60% of those charged in isis inspired acts are muslim. and the fear this has created in a lot of americans. >> i grew up in a small rural america. >> not dismissive of their fear? >> no. because i think if i was in their position and i've seen the same information, i would be like what the heck is going on when you see things on tv. >> he's reviewed every case and they're mostly not about religion. >> less than 10% of them were

recruited solely based on religious dog ma. they have taken identity grievances and mapped it on to religion. >> if you have a machine 24/7 whose whole purpose is to recruit any child is vulnerable. >> any child, any religion? >> anyone is vulnerable. >> the former and first ever state department special representative to muslim communities. she says never underestimate the power of this content. the idea that you would go to join someone who engages in beheadings, that you would suspend critical thinking about that? what's the difference in the generations? >> they can dismiss the vile and disgusting things they see because somehow it all fits into the narrative. i would say parents need to understand the tools that extremists use the same way they have made themselves away of how

a sexual predator would be online. >> if you think smart successful kids are somehow immune to the trapped doors online, come with us to the federal transfer center in oklahoma city. a jail where a guard is opening a door and on the other side there is someone who can answer questions about the story of two honor students from small mississippi towns. one of them a cheerleader. the other a soccer player. his father a math teacher. through the door mahammad dock la la. a young man who once had a bright future. had you ever been arrested before? >> no, ma'am. >> nothing? >> no, ma'am. i mean like car tickets. >> one of your friends was quoted saying he's the guy never in a bad mood. >> that is true. yeah. >> he is the son of a muslim father and a catholic mother who converted. he was a straight a student in graduate school studying psychology when he met his first

real girl friend a superstar grew up going to church on sundays, her dad a police officer, her mother a school principal. >> super smart, intelligent, always very polite, not radical in any way. >> i know the kind of person that she is. >> jaylen delshon young. >> she was so smart. the top of her class. studying to be a doctor. >> mahammad admits she was his first real relationship. what was it about her? >> looks the one thing and then the next thing is intelligence really. >> so what happened? jaelyn young has admitted in court she was the one who became so overwhelmed with her premed studies that anxiety and depression took hold and says she contemplated suicide. so she began to search for spiritual solace and looked at

idealistic propaganda videos for isis. >> these videos are dangerously inspiration inspirational. if you're in a state of anger or state of depression, they really want to try to hook you in. >> reporter: but it was jaylen herself who says she was the first one drawn to fundamentalist islam. she liked the strict rules of behavior, got in deeper and deeper and became convinced by isis propaganda that isis was misrepresented in the media. she began wearing an she wants her boyfriend to come and live with her in syria. >> it made sense to you? >> he says in truth he just wanted to be with her. >> are you saying you did this for love? >> like blind love. >> but you knew they are a savage organization? >> we took that to be like more

of a bias view from the media. >> did you really believe that? you're a 4.0 average. >> i couldn't think straight. i feel like i had a depression but i hit it so well that i never asked anybody for help. >> when you're seeing beheadings of aide workers. >> i heard about them but i never did see the videos. >> it was all over the internet. >> i didn't go to many websites and she didn't go to many websites. youtube is open outspace. >> he says he never knew that much about islam. you were willing to kill americans? >> no. it was more just like, you know, i want to help as much as i can. >> he told me he hoped maybe he could work in the pr department. then one day two years ago after months of planning these two

college students packed their bags and headed to the regional airport to travel to the middle east. what do they bring with them? craft supplies. a scrap book. a bar of soap. star burst minis and his nintendo but their isis friends online were inacunder cover agents for the fbi who moved in and arrested them. at sentencing defense attorneys arguing these were just smart kids who had fallen into depressi depression, confusion. but the prosecutors argued not so fast. these are kids who knew what isis does and they were prepared to join up. both of them expressed deep remorse but tonight jaelyn young is spending 12 years in prison after prosecutors argue they instigated the idea. we asked to talk to her. she declined. mahammad is now in for eight years. if they can reach the two of

you, where is it going to stop? >> i don't think they're going to stop until we, you know, take care of them really. >> announcer: coming up, inside a foiled terror attack in massachusetts and the surprising mastermind. >> drop it! drop it. >> drop yours. >> drop! >> drop yours. ♪ at zales, we believe a diamond kind of love is all about that look... ...right there.

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>> we have a gentleman, black male, six feet coming out now with a knife. >> reporter: he's 26 years old, has two jobs in retail at cvs, and one at best buy. he has also been researching his knife online, though he's having second thoughts, worried he'll back out. >> firmness of intent will be taken from me, and i don't want to miss it while i have it. because i know the afterlife is better than this one here. >> reporter: but there is someone there to urge him fore for ward someone with a a smile his nephew david. that nephew is an unemployed high school graduate, born in america, muslim family, who's spent hours and hours online. jihadi propagana.

violent videos, and this young man is so persuasive online, prosecutors say he was the ringleader, even managing to enlist a complete stranger through his computer. the stranger is from rhode island. he was raised in a cat lick feel and has said his cerebral palsy made him isolated too. he was struggling for his own kind of empowerment. >> i've been wanting to meet up with you to discuss some important aspects i think you might uh, you might enjoy. >> oh! that sounds wonderful! >> reporter: the nephew decides the first target will be a woman who's on the isis hitlist, pamela geller, an activist who says she's anti sharia. the other is in another city. so the uncle decides he has a new plan to kill police. the nephew is excited. >> i'm going out today, those boys in blue, because it's the

easiest target. >> oh, oh dang those juicy necks is intense, dang. at another point he also seems to refer to the isis practice of putting the victims' head on top of their chest. >> it's as they say sometimes. you know, it's like -- >> yeah. >> it's like thinking with your head on your chest. [ laughter ] >> holy crap! oh god! [ laughter ] i'm freaking insane. >> reporter: former chief prosecutor, mary mccord, says in so many of the 147 cases prosecuted by her office, men exert peer pressure on each other to keep each other from backing out. she says the pressure is especially powerful if there are also family ties. >> if a person individually might, you know, get cold feet or wanna change his mind, not only then would he be letting himself down, but he'd be letting down his co-conspirators. >> reporter: four of the 19 attackers on 9/11 were brothers, so were the brussels suicide bombers, the boston

marathon bombers. in chicago this mother learned that three of her teenaged children were recruited by isis together. >> plane tickets were in their hands about to board the plane. >> we condemn the brainwashing and recruiting of children through the use of social media and the internet. we have a message for isis. leave our children alone! >> reporter: and now we are back with that man walking across the parking lot. you see him going back and forth, across another street, into the pharmacy and out. is it possible he was still worried he'd lose his nerve? he has written out a will leaving his mother everything he has, $80 in $20 bills. >> can you put your hands up please? >> reporter: the police surround him, he threatens them with his knife. >> why don't you drop yours? why don't you drop yours? why don't you drop yours? >> drop it, drop it. >> why don't you drop yours? >> drop it drop it. >> drop yours. >> reporter: and strangely he has a phone which is still on a

call with his bewildered father, who has no idea what's happening. >> where are you? where are you? where are you? >> come on. why don't you shoot me? [ gunshot ] >> shots fired. >> reporter: the uncle is dead, and when the nephew is finally arrested we learn a kind of twist in this story. this mastermind directing events from his room with his computer, turns out to be morbidly obese, 550 pounds, and his own defense lawyer calls him quote, fat, failed, a complete idiot. she tries to argue that because he rarely left his house, and just had a computer, he was not dangerous. the jury had a different opinion. >> breaking news. david wright of refrt has been convicted, the jury had a

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this is hurricane irma barreling into south florida and as it happened the muslim community immediately turned their mosques into shelters for everyone. distributing food and water to the greater community throughout the state. nezar hamzee knows. he was working three days straight. >> i was on duty friday when the storm started to hit down here in south florida. all day and all night saturday, all day and all night sunday all day all night.

>> reporter: hamzee is a deputy sheriff. in one part of his life, law enforcement. but he's also a lebanese american muslim. a community leader so we ask him what is one practice come thing we can all do to keep young american from recruitment online. >> we need your guys help. >> he said in his community he started an intervention program, he goes from mosque to mosque spreading word families can reach out unanimously if they're worried an a single mother did. >> we talked about go check your kids computers and she found these troubling websites. >> reporter: a team moved in to help with her son, he says, and now that young man is taking part in programs to help in the community, helping others. this is mohamed farah from minneapolis who helps girls deal with any culture clash they feel. >> stuck in -- you know, in two different worlds. >> reporter: and islamic scholar

and college president sheik hamza yousef wants all americans to know that isis is not islam. >> anything that moves from mercy to cruelty has nothing to do with islam. islam is not a cult of death. the -- the koran says, "answer god's call to life." >> reporter: but as we said, we learned in this year of reporting that isis can reach into every american home, that every state has an open investigation. what are parents to do about recruitment online? those big global tech companies insist they are working on systems to help parents. >> someone types in i want to join jihad. >> for instance google is ruling out a new program so when searches how to join isis, what pops up first is a video ad steering you away from isis propaganda and toward the

reality of what isis is. for right now the most practical thing we heard from all the experts is that parents have to watch out for how many hours their children are spending on technology and in isolation. former prosecutor mary mccord. >> a lot of time in front of a computer screen whether it's playing video games or on social media, if young people want to live in a virtual world whether through the video game or their social media -- >> isolation, secrecy is where isis thrives. >> the government cannot arrest their way out of this problem. there has to be a true partnership between the government and the community. based on trust. >> announcer:

(vera wang) we got inspired. we jumped in. we got close. we waited. we tied the knot. we drifted. we walked in other's shoes. we laughed. we created something new. we keep going, together. 10 years and counting. vera wang and kohl's. i can do more to lower my a1c. and i can do it with what's already within me. because my body can still make its own insulin. and once-weekly trulicity activates my body to release it. trulicity is not insulin. it comes in a once-weekly, truly easy-to-use pen. it works 24/7, and you don't have to see or handle a needle. trulicity is a once-weekly injectable medicine

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activate your within. ask your doctor about once-weekly trulicity. ( ♪ ) 100% steam peeled. vine to can within 12 hours. we do things our way, so you can do things your way. hunt's. grow confident. over this past year of reporting we have met a lot of people. how are you? but along the way there was a group of children in denver who made us think, first they told us things they love about being american. >> our friends, our neighbors

and the food, i like pizza and -- >> right. >> my parents, they've taught me is, this is the land of opportunity. >> they are american dreams. >> maybe a doctor. >> a doctor is good. >> or a president. >> or a president? [ laughter ] that's like you're fourth choice is to be a president. >> reporter: but then other stories in the room. this young woman was on a train when an apparently unstable man started yelling. >> [ bleep ]. >> and another girl -- >> they came up to me and asked do you have a bomb in your backpack. >> and one young man thinking about the things he's been called at school. >> the boy that said i was a terrorist, i actually ignored him. and then

[ crying ] >> and he wouldn't stop saying it. he was suspended for three days. >> reporter: eventually that boy reached out. >> he came and apologized, and said that, he was sorry for calling me a terrorist. >> and after a year of reporting, one thing is clear, when the questions are this challenging, we will only find answers if we look for them together. i'm diane sawyer here in new york. for all of us at "20/20" good night.

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