Authorities are investigating racist graffiti found at Agoura High School, including a "hit list" targeting African American students, they said Thursday.
Students found the hate messages in a boy's bathroom on campus Wednesday morning, KTLA-TV reported.
It follows the discovery Sunday morning of racist messages scrawled on various school buildings, said L.A. County sheriff's Lt. Patrick Mathers of the Lost Hills station.
Authorities believe the two incidents are connected, Mathers said.
Sunday's graffiti was removed before students came to class Monday. Some parents were upset that they did not find out about that incident until after Wednesday's recurrence.
"It's really scary when your child is put on a list with other boys that are being targeted and also says they're going to die," Lorna Hill, whose son's name was part of Wednesday's graffiti, told KTLA-TV.
No suspects were in custody, Mathers said, and the investiagation was being handled by the Lost Hills station's hate crime task force.
Other parents also were upset Wednesday. Holly Afgani, mother of a student who wasn't targeted, said she was shocked a person would be able to use the words spray-painted on the walls of the high school.
"These children are kids we've known for a million years," she told KTLA. "They're the same as anybody else, and I don't know anyone who doesn't think so."