home countries. >> for girls, increasingly we're seeing romance. they make a dash for figures and some girls have wanted to marry these warriors on the battlefield. >> the parents of these kids are often first-generation immigrants. they don't not the internet that well. they certainly don't, you know ins and outs of youtube and facebook and twitter. >> reporter: the flow of teenagers from britain is disturbing. an 18-year-old happen of arrested on suspicion of preparing to join isis. he was picked up before trying to leave his hometown of birmingham england. and there were three teenage girls seen at the turkish border who got from britain to syria without their parents' knowledge. british officials say in the past year 22 women and girls have been reported missing by families who fear they traveled to syria. >> the british definitely have a problem. they've been trying to look at ways that you can find the danger signs. >> reporter: british officials wouldn't comment when we asked