When my daughter was in fourth grade, we went out target shooting. She found a bunch of shotgun shells on the ground and stuffed many in the pockets of her jacket. They were still there when she went to school on Monday… Tuesday… Wednesday…

Silly me, I didn’t think anything about it. Turns out they were dribbling out of her pockets in the hallway. When a teacher figured out where they were coming from, my daughter got a stern talking to about it being “not cool” and I received a concerned email. I responded via email profusely apologizing for my obtuseness.
And that was it.
Photo source.
You had a wise teacher handling the matter it sounds like. And a family (yours) that knew how to respond.
It’s wretched that Ahmed and his family didn’t have a similar experience. Some concern and discussion about whether that concern is merited is one thing. The gross over reaction that happened is outrageous.