https:// www.cbsnews.com/amp/news/santa-fe-high-school-shooting-texas-students-had-active-shooter-drill-before/

I realize these drills are becoming more and more common, but there are SO many of these types of "drills" that happen during/before a FF event – finding where and when these are happening might be a good way to determine potential FF Ops and do something about it in the first place - call local police, call the school, etc.