A gunman killed at least 10 people in a rampage on a small town in Montenegro on Wednesday, police said, one of the tiny Balkan nation’s worst mass killings.

A 45-year-old man, identified by police as Aleksandar Martinovic, was on the run after opening fire at a restaurant in the town of Cetinje where he killed four people.

The shooter moved on to three other locations, gunning down a family member, two children and three other people, police said. Four more people suffered life-threatening injuries.