From the NPR  Health Blog, 5 Worries Parents Should Drop, and 5 They Shouldn't:

That’s the sound of helicopter parents hovering over their children, worrying every second of the day that terrorists could strike Johnny's school or a stranger will snatch Jane from the bus stop.

Based on a survey, the top 5 worries of parents (presumably US based) are:

  1. Kidnapping
  2. School snipers
  3. Terrorists
  4. Dangerous strangers
  5. Drugs

And how do children actually get hurt/killed?

  1. Car accidents
  2. Homicide (usually committed by a person who knows the child, not a stranger)
  3. Abuse
  4. Suicide
  5. Drowning

So that either puts your mind at ease or gives you even more things to worry about that you hadn't thought of yet.

Things Parents Worry About With Their Kids