A gunman opened fire at a supermarket in Boulder, Colorado, killing 10 people, including a police officer, multiple news outlets reported Tuesday.

The attack on Monday ended with a handcuffed, bloodied and shirtless suspect being led away by police from the King Soopers supermarket.

The police officer who died was identified as 51-year old Eric Talley, an 11-year veteran on the Boulder force.

He was one of the first officers to respond to reports of gunfire and a man with a "patrol rifle" at the supermarket around 2:30 p.m., Boulder Police Chief Maris Herold said.

Video taken by an eyewitness to the supermarket shooting appeared to show individuals on the ground inside and outside the store, while gunshots are heard.

The suspected gunman used an AR-style rifle in the attack, law enforcement officials briefed on the investigation said.

Authorities did not disclose any motive for the shooting, which took place around two miles from the University of Colorado's main campus.

Matthew T. Kirsch, the First Assistant United States legal counsel for the District of Colorado, said the Federal Bureau of Investigation and other federal agents are helping in the case.

"My prayers are with our fellow Coloradans in this time of sadness and grief as we learn more about the extent of the tragedy," BBC News quoted Colorado Governor Jared Polis as saying in a tweet.

U.S. President Joe Biden was briefed on the shooting, according to White House press secretary Jen Psaki.

The bloodshed marked the second deadly mass shooting in the U.S. in a week, following a shooting rampage that left eight people dead, including six Asian women, at three locations in and around Atlanta last Tuesday. A 21-year-old man has been charged in the gun violence.

In July 2012, James Eagan Holmes killed 12 people during movie night in Aurora, around 35 miles southeast of Boulder. Holmes, who was later sentenced to 12 life terms in the murders, also injured 70 in the gun attack.