A South Dakota School of Mines and Technology student has been arrested after he left a threatening letter at the college. Rapid City police say 19-year-old Boyce Way of Mitchell was arrested fo making a terrorist threat. The felony charge carries up to five years in prison and a $10,000 fine. An employee at the school found the letter around 8 a.m. Tuesday, prompting school officials to postpone a design fair scheduled for the morning. School officials did not issue an evacuation order.