Advertisement10 People, Including Police Officer, Killed In Colorado Grocery Store ShootingUpdated March 23, 2021Vanessa RomoJaclyn DiazfacebookEmailPolice respond to an attack on a King Soopers grocery store in Boulder, Colo., where a gunman opened fire Monday. Ten people, including a police officer, were killed. (Getty Images)This article was originally published on March 22, 2021.