Three staff members of a high school in the western Bosnian town of Sanski Most were killed on Wednesday when a school employee shot them.
Police were notified at 10:15 AM (0815 GMT) that a man had opened fire at the school with an automatic rifle, the police spokesman for Una-sana canton, Adnan Beganovic, said, adding that the shooter killed the school dean, the secretary and a teacher.
"The suspect tried to take his own life and was gravely injured," Beganovic said. He was transferred for emergency treatment in the nearby town of Banja Luka. An investigation is underway.
The school had not yet reopened from the summer holidays so no children were involved.
N1 TV, citing witnesses, said that a janitor who had a history of disagreements with the management and was under disciplinary proceedings, sought out specific people and shot them. Reuters could not immeditely verify that report.
Mass shootings are comparatively rare in the Western Balkans which is awash with weapons that remained in private hands from wars in the 1990s.
In July, a war veteran in neighbouring Croatia shot five people including his mother in a nursing home and wounded six others.
No evidence alleged Bondi gunmen received military training in Philippines
At least 12 killed in Nigeria mining site attack
Russian attack on Ukraine's central Cherkasy injures six, causes blackouts
UN, aid groups warn Gaza operations at risk from Israel impediments
Israel approves natural gas deal with Egypt, Netanyahu says
