UPDATE: CentralJersey.com just reported that all students and staff at Princeton High School are now safe and sound. They also shared, "All district schools are currently in a Shelter-In-Place as a precaution." This is different from a lock down.

Princeton High School is currently under lock down following a threat prompted on the school this morning.

Patch.com reported that around 11 a.m. this morning Princeton Police responded to an unconfirmed threat at the high school. Princeton's Superintendent, Steve Cochrane,  told  Patch.com, "A shelter-in-place was issued for the school at police's advice."

Police are currently at the school doing further investigation. This is a developing story.