ROY -- Threatening graffiti found last year at Roy High and Roy Junior High schools are likely unrelated to a recent Roy High bomb plot, authorities said Monday.
"There doesn't appear to be a connection," said Anna Bond, a spokeswoman for the Roy Police Department.
On Nov. 10, Roy High School went on lockdown after officials discovered threats scrawled across walls and stalls in two girls' bathrooms.
A student told the Standard-Examiner at the time that the bathroom message was "Somebody's going to die on 11-11-11."
Nate Taggart, spokesman for Weber School District, said after the incident that the vandalism seemed to mirror a Sept. 20 incident at Roy Junior High. Graffiti, including veiled threats, was painted onto brick walls, benches, windows and trees.
A female juvenile received a citation from police for the Roy High School graffiti incident, while the incident at Roy Junior High remains unsolved, Bond said.
There doesn't seem to be any tie between those two incidents and a plot that authorities say Dallin Todd Morgan, 18, and Joshua Kyler Hoggan, 16, developed to bomb a student assembly at Roy High School, Bond said.
Both Morgan and Hoggan attended Roy High. The attack was to take place in early February, said Roy Police Chief Greg Whinham.
Prosecutors have charged Morgan with possession of a weapon of mass destruction. He is scheduled to make his first appearance in 2nd District Court on Wednesday.
Hoggan is being held at the Weber Valley Detention Center in Roy. Details about charges he faces have not been released because he is a juvenile.
A probable cause affidavit details text messages from Hoggan to a Roy High student about setting off a bomb at a school assembly and stealing an airplane from Ogden-Hinckley Airport as a getaway.
Police have said among the evidence recovered are computers, maps of the school and information about the school's security systems.
A fifth search warrant was served in connection with the investigation Friday, Whinham said Friday evening in one of his last public comments on the case.
The Roy Police Department said in a prepared statement Monday it is working with outside agencies on the investigation and will not comment further on the case.
"Our investigation is ongoing with all additional investigative material being processed with the assistance of the FBI Forensic Lab," the statement said.
"This information will be turned over to the Weber County Attorney's Office. We are grateful to the Roy city community and the Roy High administration for their assistance and continued support as we move forward in providing a safe environment for our youth and citizens."