The article linked below may be informative and of practical use while the to and fro regarding gun control continues apace.
I ran across this article (A Parent’s Guide to School Shootings) during an unrelated link chase. I found it informative, fact-based, and blessedly devoid of either a pro-gun or anti-gun agenda.
Rather, it presents specific actions students and parents can apply to their particular situations in order to be prepared, have a plan, and increase situational awareness.