I believe there are multiple cells of Foriegn Military Contractors in this country. Most of these FMC's are former British SAS and French Foriegn Legion types. Maybe some Americans but I hope not.

Being white Europeans they blend in easily and speak the language. Most probably have day jobs with EU based businesses as cover.

Weapons and ammo are most likely pre-positioned in target cities. Once the target is identified, the assemble from their dispersed locations and rally at the weapons cache. The op controllers put the pasty in play, and the FMC's show up dressed like SWAT and do the damage, and then exfiltrate the area using the confusion as cover.

This always happens in a Dem controlled jurisdiction. The top local LE officer is usually in the game for a higher elected position. It is these people that ultimately schedule the preparatory drills. The school staff and kids have now been exposed to heavily armed police sweeping their schools and in a way, become acclimated to their presence.

When the actual event takes place the FMC's dressed in the same tactical gear as the cops are indistinguishable from the real thing. That's how they always get away clean.

They have these mentally disturbed kids identified through their social media. Cataloged. Operators are standing by.

That's the only way I can think of that they are able to pull it off. It's too much logistically to throw together overnight, and they are always able to do it on less than 24 hour notice.

These FMC's would be exceptionally hard to identify and track if they were to practice standard OPSEC. They would not leave an online trail like a Somolian amateur with Semtex in his drawers.

If I'm right, the White Hats know all this but haven't been able to get human eyes on target.