A visitor to Cook County jail was trapped inside for about 30 hours over the Fourth of July weekend.
WBBM-AM reported a man was in the jail's maximum security division visiting his son when he went into a room that wasn't being used. The room's door was propped open by contractors installing cameras.
Jail Executive Director Cara Smith says the door closed, locking the visitor inside from about 6 p.m. Saturday until 1 a.m. Monday.
Smith says the man pounded on the door, but its thickness muffled his efforts. The man drew attention to his plight by breaking a fire sprinkler head to summon the fire department.
Smith says investigators are trying to determine why the door was open and why no one noticed the man hadn't checked out.