There are no typical characteristics of young people who may be more at risk than others of being radicalised.  However a sudden change in behaviour could be a potential indicator.  Sometime those at risk may be encouraged, by the people they are in contact with, not to draw attention to themselves.  If you feel there is a change in your child's behaviour, parents are encouraged to inquire about their children's well being.  It is important for parents to keep an open channel of communication that involves listening to their child's views and concerns.  You may not always agree with your child, but you should convey to them that you've understood his or her point of view and want the best for them.  However, if you are concerned about your child you should talk to a local faith or community leader, person of influence or teacher.