mohamed was one of those selected by isis to be a young cub but he didn't like it. he kept skipping the training, so isis made an example of him. they chopped off the 14-year-old's opposite hand and foot. >> they put my arm on a table and they brought out the butcher, and he cut it. this is the man who mutilated him, nicknamed the bulldozer. the most difficult time is when i go to sleep, mohamed says. then the pain really starts. mohamed cries whenever his bandages are changed. he can't afford to have the treatments done at a hospital. isis targeted children, he says. they'd give a buy some money or a bicycle and then take him in a car with a bomb to blow himself up. and isis women were equally responsible for the crimes. she had a son with an isis man. she wants to take to the boy to the united states. she says joining isis was just a big mistake. >> and you say now that you regret coming? but i'm trying to understand what it is you regret exactly. is it that you regret that you're in this situation, that you regret you're here? >> i reget the whole thing. i reget t

they understood their role in that. >> and many of those children, those isis cubs who were raised on the camp, the kids even made an isis flag, hoisted it, and chanted that they would carry on the struggle. >> unfortunately these children will grow up living in prison camps, being hated and despised. so what we should probably prepare ourselves for is the next wave of isis cubs who have tried to become normal but we'll realize that is something that will forever be beyond their grasp. >> u.n. investigators say the only way to defeat isis-style ideology is to have nurembe nuremberg-style trials. what do you think will happen to you now? >> my country will take me back or put me in jail here. >> you're resigned to your future, whatever your future is? >> whatever it is. >> do you regret joining the group? it doesn't really sound like you do, you sound like it was what it was and it happened. >> i'm not regretting coming to syria. >> despite facing years in prison, warren christopher clark has no regrets. >> maybe i go to jail. maybe i don't. it's not really, you know, a big thing to me

the so-called isis cubs were isolated, indoctrinated and given military training. he children here recently made an isis flag, flew it, and chanted that isis lives on. >> richard, you had some incredible access, wondering like how that came to be still tens of thousands of isis supporters who were in that camp that i went to they are loosely guarded they have nothing to do. if you go there, you can meet them they are starting to get restless they want to organize, and just a few days ago, the leader of isis who is in hiding, he's trying to make himself a little bit of the new osama bin laden figure, he was calling on his supporters the pentagon estimates there are about 18,000, upwards of 18,000 isis members still at large. those who are not even in that camp, to liberate the camp they want to reform the group, so isis is definitely trying to make a comeback. >> chief foreign correspondent richard engel, thank you, and congrats on your new bundle of joy, as well. >> seems like a lot is happening in this building a lot of babies. >> what's this little one's name. >>