If it was coordinated at even dozens of places across the country, it would absolutely have grave implications. To be honest, I believe this is connected to the recent swath of fake active shooter calls that have been called in to schools all over the US and even in Washington. I think someone is testing armed police/SWAT response times. Maybe I'm just crazy but I believe there is truly something big going on here below the surface. I suspect it's probably white supremacist terrorists because they're almost always the culprits behind this type of stuff.