Another school shooting threat emerged on the Central Coast, this time as a result of graffiti found Wednesday on a bathroom stall at a Santa Barbara area high school.

At about 11:20 a.m., administrators at San Marcos High School learned of graffiti on a bathroom stall in the girl’s locker room that threatened a school shooting on March 9, according to the Santa Barbara County Sheriff’s Office. School administrators became aware of the graffiti through an anonymous post on the new STOPit reporting app.

Sheriff’s deputies then immediately came to the campus and, throughout the day, investigators conducted numerous interviews with students. Investigators have yet to determine the validity of the threat, nor have they identified the source of the graffiti.

An investigation into the graffiti is ongoing. Deputies are working with the Santa Barbara Unified School District to identify the source of the threatening message.

The sheriff’s office says it takes all threats of school violence seriously. Sheriff’s officials are increasing patrols in and around the San Marcos High campus on Thursday and Friday.

Investigators request that anyone who has information about the case contact the sheriff’s office at (805) 683-2724 or anonymously call (805) 681-4171.