The greatest danger sign to be alert and aware of is by noticing any dramatic changes in behavior. If a child was always happy go lucky before the crisis event and now sits all day to watch video footage of the shooting, or other world disasters on the news channels- then you may want to figure out why they made such a dramatic shift in personality. Watch for other major changes in sleep patterns, school patterns, school performance, peer relations and so on. If you see major changes that concern you, it’s time to seek professional attention for the child with their pediatrician or with a child behavioral specialist