CHICAGO (WGN) — Court filings show a call to police from concerned witnesses led to investigators discovering hundreds of photos and videos showing children being sexually assaulted.

David Rideout, 50, a convicted sex offender, was taken into custody on Sept. 15 at the Bucktown-Wicker Park Chicago Public Library branch. He remains behind bars after a judge denied his pretrial release.

“This possession continuously victimizes these specific [victims] and perpetuates the market for the production of this material. This is extremely dangerous,” wrote Circuit Judge John Hock in the pretrial detention order.

According to a charging document, a visitor alerted security that she saw someone inside the reading room with an inappropriate image on their tablet. The security guard went to the room

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