"Once inside the school, the male took his clothes off and was walking through at least a portion of the school without any clothes on," Scranton police Chief Carl Graziano told the news station.
The burglar was also seen drinking a carton of milk he apparently took from the cafeteria, the Voice reported. The break-in happened sometime after maintenance workers finished their shift around 10:30 p.m. Wednesday.
The school was closed for the day Thursday so administrators could clean up and ensure that there was no additional vandalism in the building. Students returned to class Friday.
Administrators also shared the video footage, which was released to local media, the Voice reported. Shortly after the images were released, a school resource officer recognized Linder from his time at Scranton High.
Investigators called Linder's mother, who brought him to the police department, according to WBRE-TV.