carlballou/iStockBy EMILY SHAPIRO, IVAN PEREIRA and JEFFREY COOK, ABC News(BOULDER, Colo.) — At least 10 people, including a police officer, were killed in Boulder, Colorado, on Monday afternoon when a gunman opened fire at a King Soopers grocery store, police said.The slain officer has been identified by police as 51-year-old Eric Talley. He had been a member of the Boulder Police Department since 2010.A law enforcement source told ABC News that officers initially responded to a report of someone being shot in the parking lot of the supermarket and, when they arrived at the scene, a suspect carrying a long gun opened fire on them. Talley was the first officer to arrive on scene, where he was fatally shot.A suspect was wounded during the confrontation with police and taken into custody, according to Boulder Police Department Commander Kerry Yamaguchi, who did not immediately reveal the individual’s name or a motive for the deadly shooting.The suspect was transported to an area hospital to be treated for injuries. There are no additional suspects at this time, Yamaguchi said.Boulder Police Chief Maris Herold fought back tears at a Monday evening press conference, during which he praised Talley for his “heroic action” in responding to the incident after the police department received 911 calls of shots fired and of a “possible person with a patrol rifle.”“Our hearts … go out to the victims of this horrific incident,” Herold said. “Officer Talley responded to the scene, was first on the scene, and he was fatally shot.”Several other law enforcement agencies responded to the scene, including SWAT teams.“Without that quick response, we don’t know if there would have been more loss of life,” Yamaguchi told reporters at the press conference Monday evening.Matthew Kirsch, acting U.S. Attorney for the District of Colorado, pledged that “the full weight of federal law enforcement” will support the investigation. He said agents from the Federal Bureau of Investigation and the Bureau of Alcohol, Tobacco, Firearms and Explosives were at the crime scene.Both Yamaguchi and Boulder District Attorney Michael Michael Dougherty said they would be releasing more information on the deceased victims, including the exact number of victims, within the coming hours, after they notify families. The Boulder Police Department later posted an update on Twitter, saying the next press conference would be Tuesday at 8:30 a.m. local time and that “no new information will be released before then.”“Boulder has suffered a terrible and horrific mass shooting today,” Dougherty told reporters at the press conference Monday evening. “This is not the first mass shooting that we have had in the state of Colorado.”“My heart goes out to Eric Talley’s family, his loved ones and his colleagues,” the district attorney added. “His life was cut far too short. I also want to stress how incredibly sorry I am for all the victims killed today at King Soopers. These were people going about their day, shopping, and their lives were cut abruptly and tragically short by the shooter who is now in custody. I promise the victims and the people of Colorado that we will secure justice.”The Boulder Police Department tweeted a photo of Talley on Monday night, writing: “Rest In peace Officer Eric Talley. Your service will never be forgotten.”Rest In peace Officer Eric Talley. Your service will never be forgotten #BoulderShooting pic.twitter.com/FVximvhS2E— Boulder Police Dept. (@boulderpolice) March 23, 2021Talley’s father, Homer Talley, shared a statement to ABC News following his son’s death.“He took his job as a police officer very seriously,” Homer Talley said of his son in the statement. “He had seven children. The youngest is 7 years old. He loved his kids and his family more than anything.”Talley’s father said the late officer joined the police force when he was 40 years old and recently started training to be a drone operator so he could get a job to keep himself off of the front lines.“He didn’t want to put his family through something like this,” Homer Talley said, “and he believed in Jesus Chris.”Sen. Michael Bennet, D-Col., took to Twitter on Monday night to react to the deadly shooting.“My heart goes out to the families of the Coloradans, including a Boulder police officer, whose lives were tragically taken by a senseless act of gun violence,” Bennet tweeted. “I am deeply grateful for the swift response from law enforcement and first responders. Enough is enough.”U.S. Secretary of State Antony Blinken also addressed the shooting in his opening remarks at the NATO headquarters in Brussels on Tuesday morning.“I do want to start — before we actually begin — by expressing my own horror at the violence that occurred yesterday in Boulder, Colorado,” Blinken said, “and offer my deepest condolences to the loved ones of those who were killed, including a law enforcement officer.”The incident unfolded Monday afternoon, as the Boulder Police Department took to Twitter at 2:49 p.m. local time to warn residents of an “active shooter” and tell them to stay away from the area.ALERT: Active Shooter at the King Soopers on Table Mesa. AVOID THE AREA. PIO is en-route.— Boulder Police Dept. (@boulderpolice) March 22, 2021Then, at 4:10 p.m. local time, police tweeted out an alert telling people “to shelter in place” amid a report of an “armed, dangerous individual” about 3 miles away from the King Soopers grocery store. The shelter-in-place order was lifted at around 5:41 p.m. local time, and Yamaguchi told reporters that the incident was not related to the shooting.Eyewitnesses shared videos from the parking lot of the shopping center on social media on Monday afternoon, showing officers ordering a suspect to come out of the King Soopers grocery store with his hands up and surrender. Eyewitness videos from inside the supermarket show shoppers and employees trying to flee or hide.Andy Arellano, who works at the King Soopers grocery store in Boulder, told Denver ABC affiliate KMGH-TV that he was concerned for his colleagues and shoppers as gunshots rang out.“We were like sitting ducks, you know, and that’s one thing that I’m reliving it and looking at it in my head,” Arellano said. “And that, that bothers me, I’m still shivering, I’m still shaking.”Eyewitness Andrew Hummel told KMGH that he was at another store in the same shopping center when he heard the shots, prompting him and others to run out.“Everybody kind of sprinted toward the back of the store,” Hummel added.Hummel said his roommate works at the King Soopers grocery store where the shooting took place and hid in a storage room with some customers, texting updates to Hummel and others.“I think one of the biggest scary text[s] that he sent he just said, I love you guys, like thank you for everything, in case, like, things go bad,” Hummel said. “That was a really hard text … that’s something that I would never want to hear from any of my friends, because I knew the seriousness of what was going on and I was horrified. It was truly horrifying.”Sarah Moonshadow, another eyewitness, told KMGH that she was in the supermarket with her son when she heard four gunshots.“We were hiding down, kind of in the self-checkout area, and I just knew, like, this is a problem,” Moonshadow said. “And I started counting in between shots and then I just grabbed Nicholas, I said, ‘Move now.’”U.S. President Joe Biden has been briefed on the shooting, White House press secretary Jen Psaki told reporters Monday night.U.S. Attorney General Merrick Garland has also been briefed, an official with the U.S. Department of Justice told ABC News.Colorado Gov. Jared Polis tweeted out a statement Monday afternoon, saying he was “closely watching unfolding events at King Soopers in Boulder.”“My prayers are with our fellow Coloradans in this time of sadness and grief as we learn more about the extent of the tragedy,” Polis added.In another statement issued Monday evening, the governor asked for residents to have patience as the investigation continues.“Right now, the biggest priority is to let local law enforcement and the City of Boulder to do their work to ensure the safety of those involved,” he said.Polis released a third statement late Monday night, mourning the lives lost and showing his support for his community.“Today, ten lives were tragically lost, including Boulder Police Officer Eric Talley,” he said. “And tonight, the families of these victims, our fellow Coloradans, my neighbors, are hearing the devastating news that their loved one who simply woke up and went to work this morning, or who ran out to pick up eggs, won’t be coming home.”“This year we have all been surrounded by loss of life, illness and isolation,” he continued, referring to the impact of the coronavirus pandemic. “As spring sprung this weekend, and vaccines continue to get into arms, lightness creeped back in only for the darkness to descend on us again today. Today we saw the face of evil. I am grieving with my community and all Coloradans.”The King Soopers supermarket chain and its parent company, Kroger, released a joint statement Monday evening, offering “thoughts, prayers and support to our associates, customers, and the first responders who so bravely responded to this tragic situation.”“We will continue to cooperate with local law enforcement and our store will remain closed during the police investigation,” the statement added.The union that represents the store’s workers, United Food and Commercial Workers International Union, tweeted that it was monitoring the situation.Denver-based Major League Baseball team the Colorado Rockies also issued a statement Monday night in reaction to the deadly shooting.“The Colorado Rockies are devastated by today’s senseless tragedy in Boulder,” the team tweeted. “Our heart breaks for the lives needlessly lost and our thoughts are with everyone affected by this shooting. We are grateful for the brave heroes and first responders who acted quickly.”Copyright © 2021, ABC Audio. All rights reserved.