Dallin Morgan, 18, and Joshua Hogan, 16, were arrested Wednesday after a female student received a troubling text message from one of the suspects.
"It was a text she felt was a threat and a danger and so she immediately went to the administration," Roy Police Department spokeswoman Anna Bond told ABCNews.com. Bond declined to reveal what the text message said because of the ongoing investigation.
Administrators contacted police, who executed four search warrants on the students' homes and vehicles, and conducted a thorough sweep of the school.
No explosives turned up during the search," Bond said. "However, investigators found "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.
"We know for certain they had been planning this for at least three months," she said.
Authorities also discovered the two boys had trained on flight simulation software in preparation for their getaway.
The FBI and its Regional Forensics Computer Laboratory will assist in analyzing any confiscated computers, but declined to comment on the case in a statement.
Morgan, who is an adult, is being held at the Weber County Jail. Hogan is being held at the Weber County Detention Center.
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