A shooting at Pauls Valley High School in Oklahoma has left the school's principal, Kirk Moore, injured and a former student in custody. The shooting was reported at 2:21 p.m. and has sparked renewed discussion about school safety. The Oklahoma State Bureau of Investigation (OSBI) has taken the lead on the investigation into the incident. The shooter is a 20-year-old man and a previous student. The school's superintendent, Dr. Brett Knight, described the shooting as a "traumatic experience" for students and their families. The district initiated a districtwide lockdown and students must follow a secure process to enter the building.