A line of parents waiting to be reunited with students was building at a San Dimas school on lockdown Thursday after someone called in saying they saw someone with a gun on campus, but deputies say there is no truth to the threat.
The Los Angeles County Sheriff's San Dimas station said an anonymous person called multiple times saying a person with a gun was on campus at San Dimas High School Thursday morning around 11 a.m.
Deputies said there was no threat found as they continued to search the campus.
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A middle school nearby was also reportedly on lockdown, despite deputies saying the threat was a hoax.
Deputies were checking campuses out of an abundance of caution.
The sheriff's department also asked that parents stay away from campus, as there were no injuries reported nor any gunmen on campus.
Deputies were attempting to complete a safety sweep at 11:20 a.m.
"The investigation continues, but we have a clear indications this was a prank call. We expect to announce further," the sheriff's station said.
Deputies said an update would be provided at 3 p.m.