@Shera (and RandFan was asking too, I think): I called my sister-in-law, she teaches first graders, age 6+.
If they had an unruly kid like this, first they would bring it to the principal, to keep it away from class, other kids etc., a room to calm down or where there's nothing to destroy etc.
Then they'd call the parents of the kid to pick her up and get her out of school. That's how 99% of those incidents end.
Next step, if this happens repeatedly, the kid would get banned from school.
In severe cases, the principal would call the police. But not "normal" cops are allowed to come, only specially trained "youth police" (my humble verbatim translation) officers. They are pedagogically trained to deal with (criminal) kids of that age.
Anyway, I don't think it's a good idea to make this a country-specific issue, at least, I never implied that. I am concerned about the means to educate our kids, and I don't think a bunch of gruff cops with handcuffs is what we should strive for.