A series of hoax threats targeting schools across California’s Central Valley this week triggered law enforcement responses, disrupted campuses, and raised renewed concerns about the strain such incidents place on public safety resources.

Multiple districts — including Fresno Unified, Clovis Unified, and Kings Canyon Unified in Reedley — received threatening calls Wednesday, authorities said.

Reedley police reported a bomb threat at Reedley High School, while Clovis Unified officials determined their threat was a hoax.

Fresno police described calls in their jurisdiction as “unsubstantiated.” Among other Fresno area school districts, Central Unified reported no impact, and Sanger Unified did not immediately respond.

Officials across agencies emphasized that even false threats are treated as credible until proven otherwise.

What Happens When There Is a Threat?

Fresno Unified School District said it works with Student Resource Officer sergeants and maintains “constant communication” with law enforcement partners to assess and respond to threats.

District guidance outlines a structured response to bomb threats that includes notifying police and district leadership, potentially evacuating campuses, and organizing staff teams to systematically search school facilities.

School personnel familiar with campus layouts are assigned to inspect specific areas, including classrooms, locker rooms, offices, and libraries.

If a suspicious object is found, staff are instructed to keep a safe distance, warn others away, and wait for police or fire personnel to take over. Ultimately, law enforcement directs search procedures once on scene.

The Difference Between a Lockdown and Shelter-in-Place

The decision to escalate safety measures depends on the nature of the threat. According to Fresno Unified protocols, shelter-in-place is used “to keep students and staff away from witnessing something potentially shocking or traumatizing,” such as a nearby car accident, power outage, or medical emergency.

During a shelter-in-place, students and staff remain indoors, lock doors and continue following instructions until an all-clear is given.

A lockdown, by contrast, is implemented “to keep everyone safe when there is potential imminent danger,” such as active law enforcement activity nearby, a stranger on campus, or another immediate threat.

In those cases, doors and windows are locked, lights are turned off, and occupants stay quiet and out of sight until authorities declare it safe.

On Wednesday, Bullard High School was under a shelter-in-place order while Fresno High School was under a lockdown.

Law enforcement determines when those restrictions are lifted. Fresno Unified said a lockdown or shelter-in-place ends only when law enforcement gives the “all clear.”

Fresno Police  Communicate Directly With School Staff, Administration

Fresno police echoed that approach, saying officers “take those threats very seriously,” gather as much information as possible and respond immediately based on the circumstances, with student and staff safety as the top priority.

School Resource Officers stationed at high schools play a key role as liaisons, sharing information between campuses and responding officers.

Police said they maintain open communication with school staff and administrators and will lift a lockdown once “the scene is secure.” However, such large-scale responses can divert officers from other emergencies.

Lockdowns can have an impact on other calls for service within the city if there is a large group of officers addressing the situation at the school, Fresno police said.

Authorities warned that making false threats carry potentially serious legal consequences. Police said depending on the circumstances, a hoax threat could rise to the level of a felony.

Investigations are conducted thoroughly, including cases where calls originate online or from outside the area, police noted.

‘False Threats Against Schools Are Not Harmless Pranks’

The Fresno County District Attorney’s Office said it had not received any cases related to Wednesday’s incidents as of now, but stressed the seriousness of such actions.

“False threats against schools are not harmless pranks — they create real fear, disrupt learning environments, and divert critical emergency resources away from genuine emergencies,” Fresno County District Attorney Lisa Smittcamp said. “Our office takes these incidents very seriously, and when individuals are identified, we will review the evidence and pursue appropriate charges to hold them accountable.”

Within schools, consequences for students responsible for hoax threats vary case by case. Fresno Unified said discipline may include conferences with parents or guardians, counseling or social-emotional learning programs, community service, and other interventions. Suspension or expulsion is considered only after other corrective measures are exhausted or when required by law.

District policy emphasizes keeping students in school whenever possible while addressing behavior through counseling, restorative practices, and support programs.

More severe discipline may be used if a student’s actions pose a danger or involve serious offenses.

Officials across agencies said the coordinated response between schools and law enforcement is designed to balance caution with minimizing disruption — but acknowledged that hoax threats inevitably create fear and interrupt learning.

Even when unfounded, each call sets into motion a full emergency response.

—

Connect with Anthony W. Haddad on social media. Got a tip? Send an email.