The Kootenai County Sheriff's Office reports a backpack "exploded" at a gold mining event, leading to the arrest of a 21-year-old man on suspicion of arson.
The suspect has been identified as 21-year-old John P. Marsh of Midpines, California. He was arrested on suspicion of arson, obstructing a peace officer, and aggravated assault.
The suspect reportedly said she planned to set the entire park in Commerce on fire, an arrest affidavit stated.