Live Updates: 10 killed in mass shooting at Boulder, Colorado supermarket

A gunman opened fire in a Colorado supermarket Monday, killing 10 people, including a police officer, authorities said. One person was taken into custody at the scene in Boulder, where police said there was no ongoing threat to the public.

Boulder Police Chief Maris Herold identified the slain officer as 51-year-old Eric Talley, who had been with the department since 2010.  Boulder County District Attorney Michael Dougherty said Talley's life was "cut much too short," and said a "painstaking investigation is already underway."