Suspect in custody after shooting in Colorado grocery store leaves 10 dead including a police officer

Ten people including a police officer were killed when a gunman opened fire inside a King Soopers grocery store in Boulder, Colorado Monday afternoon.

Boulder Police Commander Kerry Yamaguchi said a suspect was in custody and being treated for injuries. Yamaguchi added that investigators were still trying to determine a motive.

According to FOX 31 Denver, police initially received a report of a man shot in a car nearby the location. According to reports, someone then fired on officers who arrived at the scene. A witness told FOX 31 Denver they heard a sound like fireworks when leaving the store and saw a man in the parking lot holding an "AR-15 style weapon" and wearing tactical gear. The witness reportedly ran back into the store to alert people inside.

Another witness told KCNC-TV that a gunman shot someone waiting in line for a coronavirus vaccine inside the store's pharmacy. The witness told the outlet that his family ran into a closet and hid.

Colorado Democrat Governor Jared Polis said in a statement that, "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. I’m incredibly grateful to the brave men and women who have responded to the scene to help the victims of this senseless tragedy."

Colorado Republican Rep. Lauren Boebert said in a tweet, "My prayers are with the shoppers, employees, first responders & others affected by the shooting in Boulder. May God be with them. While we are still awaiting important information and details in this case, random public shootings & senseless acts of violence are never ok."

Following a standoff, police forced their way into the store. Officers were seen walking out with a handcuffed, shirtless man with a bloody leg. A short time later dozens of people who had been inside the grocery store emerged and approximately 100 first responder vehicles created a procession for the body of the fallen officer.

According to Fox News, authorities were also seen "leading at least one other person out of the store and pressing him against the exterior wall of the building before walking away with him."

Multiple state and county law enforcement agencies were assisting Boulder police as well as the Bureau of Alcohol, Tobacco, Firearms and Explosives and the FBI.

This is a developing story.