Dozens of harassing phone calls made to La Jolla Country Day are part of the investigation into an alleged bomb threat that shut down the school Wednesday, FBI officials confirmed.
School officials notified parents Tuesday of a threat made over the phone relating to "a personal matter between individuals not employed by the school."
Classes and after school activities were canceled and a security sweep of the campus Wednesday netted nothing suspicious.
Hours after Interim Head Judy Fox notified parents the school would be open again Thursday, FBI officials confirmed the threat was part of dozens of harassing phone calls reported Tuesday to San Diego Police.
The individual is known to investigators but has not been arrested according to FBI Special Agent Darrell Foxworth.
The caller, a male, is not an employee or a former employee according to investigators. The caller is also not a student but FBI officials would not divulge if the caller was a parent of a student.
"We believe the alleged threat that was communicated is an isolated incident and it’s not related to any other threats that may have been made to any other high schools in recent weeks," Foxworth said.
La Jolla Country Day is a private, college preparatory school with about 1,200 students, ages 3 through grade 12.