Two men are being held without bond in the Jackson County Detention Center after allegedly threatening a mass shooting in a group text conversation on social media. Nicholas Selby, 23, and Robert Ryan, 21, both of Austin, Texas, are charged with communicating a threat of mass violence to an educational property. Additionally, Selby is charged with felony possession of a schedule I controlled substance, two counts of possession of drug paraphernalia and simple possession of a schedule III controlled substance. Ryan faces a charge of possession of a schedule VI controlled substance related to his arrest in Haywood County.