Someone reported seeing a mountain lion near the back fence of Corte Madera School in Portola Valley on Wednesday, Feb. 8, the San Mateo County Sheriff's Office reported.
The cat was reportedly seen at about 11 a.m. in the area of Alpine Road and Corte Madera Road, said Lt. Larry Schumaker of the Sheriff's Office.
The middle school, which serves fourth- through eighth-grade students, was not evacuated, he said.
As a precaution, however, the Sheriff's Office sent two deputies to stand by while students were leaving for the day.
Residents are advised to never approach a mountain lion.
Anyone who encounters a mountain lion should face the animal, make noise, and try to appear larger by waving arms and throwing rocks, emergency officials said.
More information about mountain lions is available at www.keepmewild.org.