A Simi Valley elementary school closed early Monday after the discovery of what authorities described as graffiti on the campus that included a "threatening" message.
Classes were dismissed at noon Monday at Justin Elementary School. Parents were notified via phones calls and e-mails. After-school programs also were canceled.
Simi Valley Police remained at the school in the 2200 block of North Justin Avenue Monday afternoon. Police received the report of "extensive graffiti vandalism" at about 7 a.m.
Details regarding the message were not immediately available. The graffiti was found on a building on campus.