A seventh-grade boy opened fire in a school in Belgrade, Serbia on Wednesday, killing eight children and one school guard, according to the local authorities. There were six other children and one teacher who were injured in the horrific attack, per the New York Post.

The authorities did not release the name of the suspect, but only referred to him by his initials, K.K. The statement stated that the suspect was a student at the school, born in 2009. Following the incident, the student was quickly arrested by the police in the school yard, per the report.

The authorities received a call about the incident at around 8:40 am, suggesting that there had been a shooting at the Vladislav Ribnikar primary school. The local media managed to capture the authorities escorting the young suspect from the school, with a hood over the young boy’s face, per the report.