"The Attack: A gunman killed 12 people, including two children, in Cetinje, Montenegro yesterday after a bar brawl escalated. Aco Martinovic, 45, shot victims across six locations before taking his own life when cornered by police. Impact and Response: The rare mass shooting has shocked the nation of 620,000, prompting three days of national mourning and discussions of stricter gun laws despite Montenegro's deeply rooted gun culture."