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A school shooting in Bosnia, carried out by a school employee, has left three people dead.

What’s the deal: According to officials, a high school janitor in Sanski Most, Bosnia, with a history of conflicts with management, carried out a deadly shooting on Wednesday morning. Armed with an automatic rifle, he killed three staff members: the principal, a secretary, and a teacher. The attack took place during summer break, so no students were present. After the shooting, the janitor attempted suicide, sustaining serious injuries, and was taken to the hospital for emergency treatment.

What officials are saying: Adnan Beganovic, a spokesman for the Ministry of Internal Affairs, called the shooting a “tragedy” and confirmed that the shooter “used a military firearm, an automatic rifle, to kill three school employees and tried to kill himself.”

Bosnia’s gun laws: In Bosnia, gun laws are strict, requiring individuals to obtain a license through a process that includes background checks, psychological evaluations, and proving a legitimate need for the firearm, such as self-defense or hunting. Military-grade weapons and automatic firearms are banned for civilians.

How did the shooter obtain the gun?: Police have not confirmed how the shooter obtained the gun, though the United Nations estimates that over 750,000 guns are illegally owned in Bosnia following the large-scale war in the 1990s.