THERMAL, Calif. (CNS) — Three Thermal schools were placed on lockdown Tuesday after a student turned in a magazine with bullets to the administration.

At 10:40 a.m., the Coachella Valley Unified School District announced the lockdowns at Las Palmitas Elementary School, Toro Canyon Middle School and Desert Mirage High School in Thermal.

"A student turned in a magazine with bullets to administration," district officials said around 11 a.m. It was not immediately known which school's administration took the magazine.

The Riverside County Sheriff's Department was immediately contacted and is investigating, according to district officials.

No further information was immediately available.