What are some sites I can get statistics about school shootings?

I need to do a persuasive essay on our safety plan for school and how it can be improved but I need some stats first. Please and Thank you!

What are some sites I can get statistics about school shootings?
I'm also doing a persuasive essay(on gun control). I found this site helpful.


http://www.neahin.org/programs/schoolsaf...
Reply:http://youthviolence.edschool.virginia.e...


http://www.schoolsecurity.org/trends/sch...

dr teeth