Kendra McKenzie Gill, crowned Miss Riverton in June; John Patrick Reagh, of Draper; Shanna Marie Smith, of Bluffdale; and Bryce Christopher Stone, of Riverton, were arrested Saturday morning on suspicion of detonating an incendiary device. Police labeled the actions a first-degree felony, according to records released by the Salt Lake County Jail, though the exact charges will be up to prosecutors. The foursome remained in the Salt Lake County jail on Sunday afternoon. No bail had been set.