The Children (1980)
A nuclear-plant leak turns a bus-load of children into murderous atomic zombies with black fingernails.
Sheriff Billy investigates when a bus load children from the quiet town of Ravensback disappear. He soon discovers a chemical leak nuclear plant at turned them into lethal huggers, and now they are killing residents in the town. Now it is up to him and another resident named John (whose daughter is one of the missing children) to stop them.