Serbia is in shock after a school shooting kills eight youngsters and a security guard.

A teenage boy opened fire in a school in the Serbian capital of Belgrade on Wednesday morning, killing eight children and a security guard and seriously injuring several others. The boy – a 13-year-old student at the school – allegedly sketched out the attack in advance on crumpled pieces of paper and called police himself after the shootings. The rare and possibly unprecedented event, in a nation with strict firearms laws yet high levels of gun ownership, sent shockwaves through the local community and beyond. Seven girls and one boy were killed, alongside the security guard, and a female student with French nationality was among those killed. Six children and one teacher were hospitalized, Serbia’s Ministry of Internal Affairs said.

The suspect opened fire in a history classroom, “because it was near the entrance of the school,” Mili said. He killed the security guard first, then went to another classroom where she shot some of his schoolmates. The alleged shooter of a school shooting in Serbia was arrested in an unmarked police car. According to Serbia’s Interior Minister Bratislav Gasic, the boy brought two guns from home and three frames full of 15 bullets each. Mili, the police chief, said the boy had a 9mm pistol and a small caliber pistol in a bag, as well as four Molotov cocktails.

Officials said the shooting was premeditated and displayed sheets of paper showing the suspect’s plans for the attack. The suspect’s father and mother were also arrested, according to Serbian officials. The 13 year old suspect would be placed in a special psychiatric institution, Serbia’s President Aleksandar Vucic said, adding that the shooting suspect did not show remorse.