— A white gunman motivated by hate and dressed in tactical gear killed 10 people and wounded three others Saturday afternoon at a Buffalo, New York, supermarket, officials. BUFFALO — A teenage gunman entranced by a white supremacist ideology known as replacement theory opened fire at a supermarket in Buffalo on Saturday, methodically shooting and killing 10. The revelation comes a day after a gunman killed 10 people and wounded three others at the Tops Friendly Markets store in a predominantly Black neighborhood in Buffalo.