Prosecutors say an 18-year-old man was plotting a "profoundly disturbing" attack on his western Colorado high school with weapons and explosives.
Robert Dell Johnson is being held on $100,000 bail on suspicion of criminal solicitation and interference with an education institution.
Mesa County District Attorney Pete Hautzinger revealed few specifics on the investigation into the threat against Palisade High School, but the sheriff said the threat was credible.
Deputies arrested Johnson Monday night at his home.
Johnson's attorney described his client as a "young man talking in anger and with nothing to back it up."
Johnson is scheduled to be in court Oct. 8 for formal filing of charges.
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