Police are now investigating nine cases where heavy items, including concrete slabs, have been thrown off Whitemud overpasses, some of them striking vehicles below.
See article.
Grainy surveillance footage has captured at least one male hurling items off Whitemud Drive overpasses onto traffic below.
Edit - when I was growing up (not here) I knew some very bad kids and this would have been way, way outside their zone for vandalism or violence. That's why I don't think it's just random tiktok juvenile delinquency.