SEBASTOPOL (CBS SF) — While not disclosing any details, officials canceled Friday classes at West County High School in Sebastopol and Laguna High School in Forestville after receiving a threat of violence.

West Sonoma County Union High School District officials said in a posting on their website that the threat came in on Thursday night.

READ MORE: Oakland City Council Votes To Increase Police Staffing

“We received a threat against our schools this evening,” the posting said. “In an abundance of caution and on the advise of the Sebastopol police department, we are cancelling all classes and activities at West County High School in Sebastopol and Laguna High School in Forestville tomorrow, Friday, October 29th.”

READ MORE: Bay Area Remembers 1941 Attack On Pearl Harbor That Changed America Forever

Sebastopol police and the school have launched an investigation into the threat.

MORE NEWS: 'Prolific' San Francisco Retail Theft Suspect Back In Jail After New Arrest

Officials said all activities had been canceled. West County High School had a home football game against Maria Carrillo High scheduled for Friday night.