A town in the foothills of the Sierra Nevada recently found itself at the centre of a baseless conspiracy theory that predicted an attack on a school fundraiser.

All because of an innocuous tweet from former FBI Director James Comey.

Scott Maddock, principal of the Grass Valley Charter School in Grass Valley, California, was unaware of the conspiracy theory when he arrived at work on a normal-seeming Monday morning in late April. But when he checked his voicemail, he heard from a man identifying himself as "a patriot," alerting Maddock to the "threat."

"He was warning us that something was

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