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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.

Who was Aco Martinović, The Gunman of Montenegro killed at least 12 people

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.

Who was Aco Martinović: The gunman of Montenegro killed at least 12 people
Montenegro's authorities released an image of Aleksandar Martinović while he was on the run

The gunman then went on to kill more people at other locations.

Interior Minister Danilo Saranovic called the incident a "consequence of disturbed interpersonal relations", according to AFP news agency.

The prime minister, Milojko Spajić, went to the hospital where the wounded were being treated and announced three days of mourning. “This is a terrible tragedy that has affected us all,” he said. “All police teams are out.”

Montenegro, which has a population of about 620,000, is known for its gun culture and many people traditionally have weapons.