It was about 3 months ago.
The truth is that 10 year old boy was very opened about it.
He committed it in front of the class and psychologist : " Sometimes I have a feeling that I want to hurt all of my class mates, hurt them a really bad...and somehow, I success in stopping that feeling."
That was a boy who is a really genius in mathematics, but not so in other classes.
A boy they laughed because he put of a shoes and socks during the class, and he is keeping his anger deep because of that. And that anger wants to go out... What can he do if he cannot block it anymore?
Teacher told the other kids not to laugh him anymore, and to be calm if he is near them.
Kids were terrified and they listen her carefully, and decide not to laugh him anymore.