JANESVILLE, Wis. (WTVO) — A coach at Janesville’s Craig High School was arrested on Friday after a personal recording device was found in a girl’s locker room.

The school’s resource offices were notified of the device during school hours, according to the Janesville Police Department.

Police Chief David Moore said at a press conference on Monday that staff found a GoPro camera around 9:30 a.m. in a locker, hidden beneath a towel a female student had previously reported missing.

The camera was turned over to the school resource officer, who reviewed the footage and arrested Brian Kitzman, 38, at 2 p.m. that day, as he was boarding a bus bound for a track meet.

Police said Kitzman was seen in the footage placing the camera in the locker.

An assistant track coach and formerly a swim coach for boys and girls teams, Kitzman was employed with the school district since 2004, according to Janesville School Superintendent Mark Holzman.

Police also searched Kitzman’s home and recovered evidence there, Moore said.

Police said Kitzman may have been recording victims over the course of 2 years and could involve 18 victims in total.

Moore said it is not believed at this point that Kitzman shared the images with others, based on his statements to police following his arrest, but the investigation is ongoing.

Holzman said police and staff conducted a sweep of the school’s locker rooms and restrooms and did not find any further recording devices.

Kitzman was arrested for Possession of Child Pornography, Invasion of Privacy and Representations Depicting Nudity.

He is being held in the Rock County Jail.

Holzman said support staff from other schools, along with comfort dogs and additional police have been brought in to make students feel more at ease.