In a tweet, the Los Angeles School Police Department announced the lockdown shortly after 8 a.m. at the campus in the 800 block of West 60th Street.
"Staff reports seeing a suspect point a gun at another person in front of the location," police said on Twitter, adding a description of the individual being sought. No gunshots or injuries were reported.
Video from AIR7 HD showed several officers conducting a search in a parking lot across the street from the school.
Just before 9 a.m., the Police Department said the suspect was located in a nearby store and the lockdown was lifted.
Although no students were present at the school due to pandemic restrictions, staff have been working on-site.