TRACY -- Police set up a mobile command post on a high school campus in response to a graffiti threat found in a restroom, the second such incident at a Bay Area school in the past week.

Two students found the graffiti in a girls restroom at John C. Kimball High School last week, according to district spokeswoman Jessica Cardoza. She would not detail what the message said, but said it did not contain a threat to a specific group of people and did not mention a gun or shooting.

School officials removed the graffiti and were investigating, but did not believe the message constituted a specific threat, Cardoza said. Still, students began sharing photos of the graffiti over the weekend. Rumors quickly spiraled to include claims that the message had threatened a shooting on Wednesday, which was false, Cardoza said.

The school was flooded with concerned calls from parents on Monday, Cardoza said, and officials called in extra police and private security.

Tracy police set up their mobile command center on the campus Wednesday, and the day has thus far been uneventful, she said. Attendance was "definitely lighter" than on an average day, Cardoza added, but she did not have specific figures.

Both the district and Tracy police were investigating the threat, she said.

The extra police and security will likely remain on campus Thursday and possibly through the end of the week.

Foothill High School in Pleasanton was also host to an increased police presence Wednesday, due to a graffiti threat found in a girls restroom on Tuesday.


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Contact Daniel M. Jimenez at djimenez@bayareanewsgroup.com. Follow him at Twitter.com/DMJreports.