No students at Mint Canyon Community School were injured, the superintendent of Sulphur Springs Union School District told ABC7.
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Whether the shooting occurred on campus or near the school grounds was not immediately clear.
Los Angeles County sheriff's deputies and firefighter-paramedics responded to the incident. News video from AIR7 HD showed deputies escorting a group of young students into a building.
No one was in custody in connection with the shooting, and a description of a suspect was not available.
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Firefighters were later released from the scene, and the school transitioned to a "soft lockdown," officials said.