Perhaps, Foxy, you might consider providing your students a similar forum.

Thanks for sharing your story, and also for the suggestion. However, it was the first thing I did in every class yesterday. I have made it quite clear to all my students that this is a subject I am more than prepared to talk with them about. One of my grade 11 students has a younger brother in the school where this tragedy happened, and so far he is the only one who has openly discussed it.