A 21-year-old man has been charged with 10 counts of first-degree murder following the mass shooting at the King Soopers supermarket in Boulder, Colorado, on Monday.

As reported by NBC News, Ahmad Al Aliwi Alissa was charged after being arrested at the scene following a stand-off with police.

Boulder police Chief Maris Herold confirmed in a morning press conference on Tuesday that the suspect was shot in the leg prior to being taken into custody.

The mass shooting resulted in the deaths of 10 people, including 51-year-old police officer Eric Talley - a father of seven children - who was the first officer to attend the scene yesterday afternoon.

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Colorado Gov. Jared Polis also told reporters at the press conference: "We will hold the evildoer responsible to the fullest extent of the law for his actions."

Herald also named the nine other victims who lost their lives yesterday; Denny Strong, 20, Neven Stanisic, 23, Rikki Olds, 25, Tralona Bartkowiak, 49, Suzanne Fountain, 59, Teri Leiker, 51, Kevin Mahoney, 61, Lynn Murray, 62, and Jody Waters, 65.

Per ABC News, Boulder District Attorney Michael Dougherty confirmed that Ahmad Al Aliwi Alissa will be taken to the Boulder County Jail once he is released from the hospital, which is expected to be later today.

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Speaking at a press conference yesterday following the initial arrest, Herold confirmed that the suspect was in custody and was receiving hospital treatment. "I want to reassure the community that they are safe," she said.

Herold also spoke about officer Talley, who had been with the Boulder police department since 2010.

"The heroic action of this officer when he responded to the scene... phone calls of shots fired in the area and a phone call about a possible person with a patrol rifle," Herold said, adding: "Officer Talley was the first on the scene and he was fatally shot."

On Twitter, the department paid its respects to the late officer, writing: "Rest In peace Officer Eric Talley. Your service will never be forgotten."

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In a follow-up statement on Twitter, the department said: "King Soopers spokesperson offers condolences, thoughts, and prayers to employees, customers, and first responders. Company will refer all questions to law enforcement."

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Polis also responded to the incident on social media, writing: "My prayers are with our fellow Coloradans in this time of sadness and grief as we learn more about the extent of the tragedy."

And per Sky News, Boulder County district attorney Michael Dougherty told reporters: "These were people going about their day, doing their shopping. I promise the victims and the people of the state of Colorado that we will secure justice."

Featured image credit: Boulder Police Department/Twitter

Man, 21, charged with 10 counts of first-degree murder after Colorado mass shooting