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WEST SACRAMENTO, Calif. (KTXL) — A school shooting threat prompted a lockdown Wednesday at a West Sacramento high school.

An anonymous call to staff at River City High School on Raider Lane led to a lockdown announcement around 1:40 p.m.

Washington Unified School District said, as of Wednesday afternoon, police believed the threat was unsubstantiated.

In a Facebook post, WUSD told families students would be released from school at 1:45 p.m. and families could pick them up at the nearby Target parking lot.

All on-campus activities were canceled for the rest of the day.

Officials are investigating the incident, and social workers will be at the school to offer support for both students and staff.

Law enforcement was called to Jesuit High School in Carmichael Wednesday, as well as other schools across the country, after a student in Florida allegedly posted a threatening photo on Snapchat he later claimed was a joke. Florida officials said the student has since been arrested.