SANTA ANA, Calif. (KABC) -- Mater Dei High School in Santa Ana will be closed through the end of the week due to what's being called a "credible threat."
School officials learned about the threat Tuesday, but did not reveal what it was.
"We acknowledge the alarming nature of this message; however, we at Mater Dei take all threats made to the school seriously," said the school in a statement.
Santa Ana police responded, and safety and sweep protocols were implemented.
Detectives are still investigating, but the Mater Dei campus and campus activities are canceled through Friday.