The South Butler County School District is operating on a “modified lockdown.” and a student, Jason Bowen, has been taken into police custody.

The district was alerted to “a serious threat to student safety,”  by the Penn Township Police Department.

Authorities say Bowen posted a video of himself firing an AK-style rifle to Snapchat with the caption “Training for Prom Walk.” Police say they also found drugs and brass knuckles in his bedroom.