At least 12 people were killed and at least 10 others injured when a gunman burst into a packed Southern California bar overnight and opened fire, authorities said. Haven’t we heard this story before? What are the common features of these attacks? In the last two weeks alone, a man shot dead two people yoga studio in Florida, and another gunman opened fire on a synagogue in Pittsburgh, killing 11. Just as the Parkland and Santé Fe school shootings this year, the synagogue attack, and others, this attack occurred in another gun-free zone.