Police said no safety issues were found during their search of the campus.
SIMI VALLEY, Calif. (KABC) -- Royal High School in Simi Valley was deemed safe Wednesday afternoon following a brief morning lockdown.
It's unclear what exactly triggered the lockdown, but according to the Simi Valley Police Department, no safety issues were found during their search of the campus.
Officers were seen conducting security and safety checks at the school around 11:30 a.m. The lockdown was lifted a few hours later.
Police said all students were locked down in their classrooms during the safety sweeps. When the initial police advisory was sent, police said there was no need for parents to go to the school.
No injuries were reported.