Updated--The Ventura County Sheriff's Office is investigating an anonymous and unsubstantiated social media threat regarding Nordoff High School in Ojai.
They say it appeared on an obscure social media page over the weekend.
Deputies say the threat had to do with a shooting at the campus Monday.
Investigators tried to trace it to a source but were unable to do that.
Nordhoff sent a recorded message to parents Sunday night telling them about the situation.
Extra deputies were on campus Monday but school officials reported no problems.