BOULDER, Colo. - A man seen bloodied and limping as he was led away by police in handcuffs has been arrested on suspicion of killing 10 people, including a police officer, at a Colorado grocery store, marking America’s second fatal mass shooting in a week.

The gunman, who was not publicly identified, opened fire at a King Soopers outlet in Boulder, about 28 miles (45 km) northwest of Denver, in the late afternoon on Monday (March 22), sending panicky shoppers and employees scurrying for cover as hundreds of police officers converged on the area.