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"I'm a psychopath who needs to calm down."

This is what 13-year-old Kosta Kecmanovic, who carried out the shooting with victims and wounded in a school in Belgrade, said.

The boy only reported the tragedy to the police and those were his first words, the city's police chief, Veselin Milic, told Serbian RTS.

It has already become clear that during the preparation of the crime, the boy even made a list of the names of the children he wanted to eliminate.

The bloody event was planned a month ago.

The police found four Molotov cocktails and two pistols in the backpack of the juvenile killer.

They are the property of his father, who had a permit.

The 13-year-old took them from the family safe, Nova TV also reported.

The tragedy in Belgrade: Who is the seventh grader who killed eight children and one adult at school

"According to unconfirmed information, he went with his father to shooting ranges and learned to shoot.

What can I say... Is it right for a 13-year-old child to deal with such things?”, asked the Minister of the Interior of Serbia, Bratislav Gasic.