'Tragedy, nightmare': Gunman kills 10 in Boulder, Colorado supermarket, including police officer; shoppers 'stampede' for cover

Multiple people were killed Monday, including a police officer, when a gunman opened fire at a supermarket in Boulder, Colorado.
Read more: https://www.usatoday.com/story/news/nation/2021/03/22/boulder-shooting-police-report-active-shooter-colorado-grocery-store/6956943002/?source=Snapzu