By James Nelson
ROY, Utah (Reuters) - Police in Utah have arrested two high school students accused of making detailed plans to bomb a school assembly and then escape in a plane they planned to fly themselves, authorities said on Thursday.
The suspects, aged 18 and 16, were arrested on Wednesday after being pulled out of classes at their high school in the city of Roy, about 30 miles north of Salt Lake City, Roy police spokeswoman Anna Bond said.
"Initial investigative discovery has uncovered a plan to use explosives during a high school assembly," Bond said in a statement.
"Maps of the school and information about security systems had been prepared with plans for an escape using a plane from the Ogden Hinckley Airport," she added. "Self-taught usage of technical flight simulation programs were used in the planning and preparation."
The students were booked on suspicion of conspiracy.
No explosives were found at the school during the investigation, which was prompted by a tip from a student.
It was not clear when the attack on the school assembly was scheduled to occur. The school was in session on Thursday. The FBI will assist in a forensic analysis of the computers used by the students, police said.
(Writing by Alex Dobuzinskis; Editing by Dan Whitcomb and Peter Cooney)