My apologies if this has already been posted & I just overlooked it. The FBI has a recently-released report called Active Shooter Incidents in the United States in 2016 and 2017. The title is pretty self-explanatory, and it has some interesting statistics on intervention into active shooter incidents by both armed and unarmed citizens.
I don't want to spoil the ending, but this is less than 20 pages and the conclusion is very interesting.
I don't want to spoil the ending, but this is less than 20 pages and the conclusion is very interesting.