Police were called at 9:53 a.m. to the East Flatbush campus on Kings Highway near E. 96th St., according to officials. Officers found a loaded 9mm handgun in the student’s waistband just before 10 a.m. and took him into custody. Charges are pending as investigators work to determine why the firearm was brought to school and how it was obtained. The school does not use metal detectors; sources offered differing accounts of how staff were alerted, including a possible phone tip or a student notifying teachers. The incident follows a recent case at Queens’ Benjamin Cardozo High School in which a student was arrested after an Instagram threat and a loaded handgun was recovered.