The Citrus Heights Police arrested a 16-year-old student who was found to be in possession of a loaded handgun on San Juan High School grounds.

According to a press release by the department, an anonymous tip led school resource officers to the student. After searching his backpack, they found a handgun and a substance they believe to be marijuana.

The student, a Citrus Heights resident, was arrested and charged with possession of a concealed firearm, possession of concealed firearm on school grounds, and possession of marijuana for sale. The investigation is ongoing. The suspect’s name and picture will not be released because he is a juvenile.

The Citrus Heights Police Department believes this is an isolated incident.