A 14-year-old boy, who killed nine children and a security guard in a Belgrade school shooting, testified at his parents' trial. He has been in a psychiatric institution since the May 2023 attack and cannot be tried due to his age. His parents face charges for failing to secure weapons. The boy's testimony aimed to uncover the motive behind the shooting, which left parents devastated. The trial has raised questions about the boy's upbringing and the circumstances leading to the tragedy.