Eighteen-year-old Dallin Morgan was arrested Wednesday and booked into the Weber County Jail, and a 16-year-old boy also was taken into custody.
School administrators and police say they learned the students had collected maps of the school and documents about security systems. Officials say the students had a detailed escape plan that included using an airplane from the Ogden Hinckley Airport and used flight simulator software to prepare.
Local and federal agents searched the school, two vehicles and two homes, but found no explosives. The FBI is also examining computers.
School is in session Thursday.
Roy is 35 miles north of Salt Lake City.
