If it’s true, and the linked article seems to suggest that it is, then those Lebanese athletes involved should be immediately barred from the games, and from the venue entirely.
Simple as that.
If you want this kind of ordure to stop, then you expel those who produce it.
“But, but, but…” I hear you say, “then they’ll come back with bombs and guns!”
Well, gee. The only response to that is: if that’s true, then it’s way, way long past the time when people should have dealt effectively with these cretins.
So, start now. Grow a spine, and pray that it’s not too late.