Fullerton Union High School was placed on lockdown Friday morning, March 28, after a water gun was mistaken for a firearm, police said.
Just before 9 a.m., a school resource officer was notified of a man in a vehicle on the 600 block of North Pomona Avenue, across the street from the campus, who may have been in possession of a gun.
The high school was placed on lockdown, and officers were sent to the scene.
An investigation revealed that the man was actually a student, and was not in possession of a firearm, but rather had two water guns in his vehicle
The lockdown was lifted by midday.
Comments on social media indicate the episode may have been connected with a senior class activity known as “Senior Assassins.” In the game, students must eliminate their targets – classmates – with water guns.