An eighth-grade student at Meadowbrook Middle School was detained when school staff discovered a so-called "hit list" with names of faculty and students.
The list was discovered around 11:30 a.m. Thursday at the Poway school, located in the 12000 block of Meadowbrook Lane. The school is just off Pomerado Road.
As a precaution, everyone whose name was on the list was notified.
Deputies will be conducting increased patrols on Friday as a precaution.
In an email, the school relayed the information to parents.
"As a precaution, we have already been in contact with families as needed throughout our investigation. We are cooperating with law enforcement and will provide any additional information as necessary," the school said, in part.
Sara Aslop has three children at Meadowbrook Middle School--one child in seventh grade and two in sixth grade. She said she did not expect to receive the email notifying her of the incident.
"I certainly didn't think it could happen here," Aslop said.
She told NBC 7, she wonders who the student may be.
"To think of it as being somebody that they have in class every day or somebody that they pass in the hall every day," she added.
Deputies with the Poway Sheriff's Station are investigating the incident in cooperation with the school district.
No further information is available.
Anyone with information about this incident is urged to call the Crime Stoppers anonymous "Students Speaking Out" hotline at (888) 580-8477.