Report of gun prompts lockdown at Fallbrook and Ivy high schools

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FALLBROOK, Calif. - A report of a possible gun-related threat against Fallbrook and Ivy Continuation high schools prompted precautionary lockdowns Wednesday at the two neighboring campuses.

This image was shared on Snapchat and prompted two schools to be locked down on March 22, 2017.

The security alerts at the northern San Diego County campuses went into effect just before 11 a.m., according to school and sheriff's officials. Students and staff at both campuses were safe as authorities investigate the claim, officials said.

Deputies were dispatched to check for any hazards at or around the campuses. The lockdowns were lifted around 3 p.m. Sources say one student has been detained at Fallbrook High School and authorities did not find a gun.

One parent told FOX 5, a student posted a picture of a handgun on Snapchat. The image referenced "Fallbrook" as the app locator.  The parent's child told her the student was at school Wednesday and was being questioned by investigators.

Administrators passed out buckets to teachers locked inside classrooms to use as makeshift bathrooms, a source told FOX 5. They also gave students food and water.

FOX 5 obtained an email the principal of Fallbrook High School sent parents Wednesday. It read in part:

"After an exhaustive search of our campus, no weapon was found. School will resume like normal tomorrow."

In February, three students were arrested at Fallbrook High School after allegedly bringing a loaded gun on campus.