Authorities have arrested two 15-year-old girls from the Corona-Norco Unified School District for allegedly plotting a school shooting targeting Corona High School. The girls reportedly spent months planning the attack and had compiled a list of potential targets, including teachers and students. Officials believe that revenge may have been a motivating factor behind the plot. The investigation was initiated following a tip from the FBI, leading to the arrests in Southern California. The school district has released statements confirming the incident and providing new details about the thwarted plan, emphasizing the seriousness of the situation.