Opening of the trial of the parents of the Belgrade school killer: 10 people were killed by their son, then 13 years old.
Trial of Belgrade school killer opens in Serbia.
Last May, their 13-year-old son opened fire in his school.
Kosta Kecmanovic had killed a supervisor and nine of his comrades.
The teenager is now placed in a psychiatric establishment.
In Serbia, minors are not criminally responsible.
His parents are being prosecuted for not having protected access to the weapons and ammunition they owned.
The trial is held behind closed doors.