A high school was searched Thursday after a student told a family member she thought someone had a weapon on campus, but no weapon was found, officials said.
Palm Desert High School was locked down and Riverside County sheriff's deputies arrived shortly after 8 a.m.
The lockdown was lifted at 10:30 a.m., said Jon Gaffney, Desert Sands Unified School District assistant superintendent for personnel services.
The incident originated when a student called a family member and reported she saw a former student on the campus with a weapon, and the family member called the school, Gaffney said.
No weapon was found and the former student in question was not located, he said.
Another campus, Summit High School, was also locked down for about 90 minutes.
"This is our normal procedure. It wasn't because of what happened yesterday," said Susan Raby, secretary to the interim district superintendent, referring to a shooting Wednesday at a Cleveland, Ohio, high school in which a student wounded four people and killed himself.
Palm Desert is near Palm Springs, about 100 miles east of Los Angeles.