The threat, reported to 911 by a parent on Thursday morning, said the teen said he was “tired of being bullied,” the sources said.

Police swarmed the school as students were ordered into a lockout, with sources saying Long Beach Middle School and Long Beach Elementary School also affected.

Long Beach Schools Superintendent Jennifer Gallagher told News12 that the lockout — which shuts the building down so on one can enter — was only a precaution.

“Please know that all students and staff are safe,” she told the outlet.

Additional details were not immediately available.

This is a developing story. Please check back for updates.