The FBI has arrested a 19-year-old man from Raleigh who, according to the agency, had developed an obsession with mass shooters.
Investigators say Eric Byrd also posted messages on social media threatening to carry out a similar act himself.
Authorities report that he shared photos of himself holding firearms along with disturbing posts containing racist, homophobic, and pro-Nazi remarks.
Officials detained Byrd on March 9 under an involuntary commitment request after Meta flagged the concerning content to federal authorities.
He now faces a charge of communicating a threat.