The 5 deadliest mass shootings in US history

The attack was the seventh mass killing this year in the US, following last week’s shooting that left eight people dead at three Atlanta-area massage businesses.

Police work on the scene outside a King Soopers grocery store where a shooting took place Monday, March 22, 2021, in Boulder, Colorado. Picture: AP Photo/David Zalubowski

A shooting at a Colorado supermarket killed 10 people, including a police officer who was the first to respond to the scene, authorities said.

Police have identified a 21-year-old man as the suspect.