The terrible threat is that some type of explosive device could be detonated at the west Santa Clara campus. While it's unclear whether this is a juvenile prank, school officials and police are taking it seriously -- investigating and adding security.
The Santa Clara Unified School District says it discovered the graffiti scrawled on a school door at Briarwood Elementary two weeks ago, on August 4. The message threatened that an explosive device would be set off on August 20.
On Monday, the first day of school, the district superintendent sent parents a letter advising them of the threat and the extra security precautions they're taking.
Briarwood elementary will remain open -- it'll be a business-as-usual school day, but certainly the parents of the nearly 400 students who attend there will now be on high alert.
In addition to the watchful eyes-and-ears of parents and the usual school campus officers, extra police will also patrol the residential area around this 12-acre campus.