A movie I saw when I was a kid I guess 80's where a school bus full of kids were in an accident and I think drove through some weird fog or stuff and after that all the kids if they touched someone that person would burn to death in their grip.
http://www.badmovies.org/movies/thechildren/
This request was repeated (and answered) elsewhere - it is definitely THE CHILDREN (1980) or the remake (same title) from circa 2008...