Cetinje

At least some of the deaths happened inside a restaurant in the Cetinje area, before the suspect reportedly moved to other locations.

"We are at the crossroads which will eventually determine our future," Milatovic said at a news conference in Cetinje, the former royal capital of Montenegro.

The attacker used a hunting rifle to first shoot to death two children, 8 and 11, and their mother, who lived as tenants in his house in the western city of Cetinje’s Medovina neighborhood.

Two others suffered less severe injuries and were recovering at a hospital in Cetinje.

Prime Minister Dritan Abazovic of Montenegro wrote on his Telegram channel that there had been “an unprecedented tragedy” in Cetinje and said that a three-day mourning period would be declared in Montenegro starting Friday evening.