Lockdown lifted at high school in East County

SPRING VALLEY, Calif. (FOX 5/KUSI) -- Mount Miguel High School in Spring Valley was placed on temporary lockdown Friday, education officials said.

Just after 3:40 p.m., a school resource officer with Mount Miguel High School was informed of a possible school threat, according to the San Diego County Sheriff's Office.

The threat, which was believed to have been related to a physical altercation between students earlier in the day, had been relayed to a third-party, authorities said.

When law enforcement arrived on campus, deputies identified and contacted a student involved in the incident, as well as their parents.

Authorities conducted a search of the student's residence and school, but no weapons were found. The campus was lifted after the search, per SDSO.

Mary Rose Peralta, interim principal at the high school, sent out a letter to families saying they were investigating "a concerning social media post related to our school."

Around 5:30 p.m., there was an update following law enforcement's investigation. Peralta said "the concerning social media post referenced in my previous update and found no evidence to substantiate any threat to our campus."

The school confirmed that all students and staff were safe, and that all campus activities would proceed.

Those in attendance for the high school's football game were asked to temporarily exit the bleachers.

"We take all potential safety threats very seriously, no matter how credible they may appear. We appreciate the swift response of our law enforcement partners in investigating the situation and keeping all of our students, staff, and community members safe," Peralta said.

The incident comes after an elementary school in San Marcos was temporarily placed on lockdown Friday morning after a report that two armed men were seen near the campus, authorities said. The report turned out to be unfounded.

SDSO advises to report threats or reports of violence to the sheriff's school resource officers or call the anonymous Crime Stoppers Students Speaking Out Tip Line at 858-322-6205 or Sheriff's Office at 858-868-3200.