BOULDER, Colorado — Ten people have been killed, including one police officer, after a gunman opened fire at a King Soopers grocery store Monday afternoon.
One person of interest was injured in the attack and taken into custody during a tense, hours-long response by law enforcement.
"This is a tragedy and a nightmare for Boulder County," District Attorney Michael Dougherty said at a press conference.
Police chief Maris Herold identified Eric Talley as the officer who was killed while responding to the standoff. Herold said Talley had been "heroic" and was one of the first officers on scene.
The names of the other nine victims would not be released until families were notified, Herold said.
Livestreams at the scene showed police in tactical gear attempting to enter the store, the windows of which were broken. In one livestream, a shirtless man was seen being led out in handcuffs.
A nearby resident told BuzzFeed News they had heard dozens of shots in one rapid-fire burst. Later, police could be heard ordering the suspect to surrender.
After first surrounding the supermarket building, police broadcast a message on a loudspeaker: "This is the Boulder Police Department. The entire building is surrounded. I need you to surrender now."
After the person of interest was taken into custody, police said they did not believe there was any additional threat to the area.
When shooting broke out around 3 p.m., shoppers and others scrambled to flee the scene.
"I was just at the Whole Foods right near there and was leaving and people were running from the scene," Alicia Miller, a woman who was in the area, told BuzzFeed News. "I talked to people who said they'd been inside the store and had rushed back in and tried to help people."
Neven and Quin Sloan were inside King Soopers when they first heard a loud bang that seemed to come from outside the store. The bangs began to sound closer, coming from inside the store, Neven told BuzzFeed News.
"I sprinted over to her and just shoved her out the door and was like, 'Hey, we've got to go,'" he said.
David Pendlebery told BuzzFeed News he hid in the store's bathroom, crouching behind a toilet when shots rang out. He stayed there for about 20 minutes until the noise quieted down and he felt he could safely escape through an emergency exit.
"I knew it was the time to get the fuck out of there," he said.
A livestream from ZFG Videography, a YouTube channel dedicated to covering the city of Boulder run by citizen journalist Dean Schiller, appeared to broadcast footage from the supermarket as the attack unfolded. In the video, two people can be seen lying in the parking lot as an empty Toyota SUV sits on a ramp.
"We've got injured parties on the ground," the livestreamer says in the video. "We don't know if there's an active shooter somewhere."
The video then showed another man gesturing that someone was still in the store and a third person lying next to a checkout area. "Oh my god, we've got people down inside King Soopers," says the man filming the video.
Two gunshots can then be heard from inside the supermarket. "Goddamnit," he says. "I'm fucking getting away, guys."
"There's a shooter! Active shooter!" he yells to people in the parking lot who have come to check on the injured. "Get away! Get back."
As police enter the supermarket, people can be heard telling officers, "Back of the store is where I last saw him!"
An hour after their initial warning for residents to stay away, police again told people to avoid the scene, which remained active.
Meanwhile, across the street, people who had been inside the store huddled with other concerned residents and waited for information about victims in the attack.
Around 5 p.m. local time, multiple officers were also seen running from the grocery store and driving to another location.
Boulder police then asked people near the residential area of 17th and Grove streets, about 3 miles from the King Soopers store, to shelter in place because of a report of an "armed, dangerous individual." Just over an hour later, authorities said the incident proved to be unrelated to the King Soopers shooting and lifted their shelter-in-place order.
Colorado Gov. Jared Polis said he was following the events as they unfolded.
"My heart is breaking as we watch this unspeakable event unfold in our Boulder community," he said. "We are making every public safety resource available to assist the Boulder County Sheriff's Department as they work to secure the store."
Brianna Sacks reported from Boulder. Salvador Hernandez reported from Los Angeles and David Mack reported from New York City.