Osama Bin Laden said 1 Million American children must die.
The plans have been laid out. Take control or create diversions or outright takeover of police and first responders, while actually attacking at schools. Repeat that scene at several locations at once. Complete chaos.
I seem to recall some kind of situation a couple of years ago where some visitors (I do not recall if they were muslims) in their 20s got on a school bus “just to observe”.