It could just be rotten reporting, but this sounds as if grown men boarding a school bus is not an unusual thing in that area, since it was their "behavior," not their presence, that concerned the driver.
No one seems to be concentrating on the implications of letting grown men, with no association with the school, on a school bus. The fact that one of them was wearing a black trench coat with shorts, and the statement that they "wanted to have some fun" . .kind of tickles the mind to think in terms of "perverts," rather than terrorists.
At the very least, the driver should be fired, and a whale of a stink made by parents.
Not sure if I pinged you on this, rod .... pass the word on.