“Come out with your hands up,” the officers said.
One patient from the scene was being treated at Foothills Hospital in Boulder, according to a spokesman for the Boulder Community Health System, who said he was not able to release information on the patient’s condition.
Taylor Shaver, who works at Art Cleaners, a dry cleaning and laundry business near the supermarket, said that she heard at least 10 gunshots and saw people running from the grocery store.
“I’m in the bathroom hiding,” Ms. Shaver said. “I heard this loud boom. I instantly knew. There was a ton of shots. My stomach dropped.”
Ms. Shaver, 18, added that it was particularly unnerving because it was her first day working alone at the dry cleaning business. Jordan Crumby, a student at the University of Colorado at Boulder, said in an interview that she was about to get a tattoo with the word “warning” on her hip at Auspicious Tattoo, a shop across from the grocery store, when the shooting began.
Ms. Crumby, 31, said she stepped outside to record a video of the scene for her Instagram feed, when the police waved her away. In the videos, officers with tactical gear and rifles could be seen swarming the shopping center. People from the grocery store, she said, were being evacuated.
“They had their hands over their heads and they’re getting escorted out,” she said. “I said, ‘We should probably go inside.’”
Colorado has been the scene of a number of fatal mass shootings in recent years, including one at a crowded movie theater in Aurora during a midnight screening of a Batman film in 2012 that left 12 dead. At Columbine High School in Littleton in 1999, a teacher and 12 students were killed
Bryan Pietsch reported from Boulder, Neil Vigdor from Greenwich, Conn., and Will Wright from New York. Reporting was contributed by Erik Vance, Ali Watkins, Azi Paybarah, and Shawn Hubler.