A gunman opened fire at a supermarket in Boulder, Colorado, on Monday, killing 10 people, including a police officer, before being arrested, marking the second deadly U.S. mass shooting in less than a week.
Police gave few immediate details of the shooting and no known motive for the violence, which unfolded at about 3 p.m. at a King Soopers grocery store in Boulder, a north-central Colorado city at the eastern foot of the Rockies, about 28 miles (45 km) northwest of Denver.
Frantic shoppers and employees fled for cover through the supermarket as law enforcement officers swarmed the scene, located about 2 miles from the University of Colorado's flagship campus.