International Desk: At least 10 people have been killed in an attack by gunmen on the market of essential commodities in the US state of Colorado,. A police officer was also killed in the shooting. Local police officials and the country's media have confirmed the information. News from the BBC.

Boulder Police Chief Mary Herald told a news conference that 10 people, including a Boulder police officer, had been killed at the King Spurs supermarket. The police officer was seriously injured in the shooting.

Eyewitnesses showed the shooting live. Later it was also promoted on YouTube. The cause of the attack is still unknown. Not much is known about the suspected gunman. Police say the incident is being investigated. The sound of gunfire could be heard from far away.

Colorado Attorney General Phil Weisser said in a statement that he was outraged by Monday's attack. “I am deeply hurt and angry,” he said.

Boulder police tweeted of the incident. There, it is said, the gunman attacked Mess Messrs. King Shoppers Street. Two hours later, people were warned to avoid the area.

"I don't know what's going on here," said one eyewitness. "I heard gunshots. A gunman was firing on people."

Another eyewitness videotaped the shootings. There were bodies lying inside and outside the supermarket. Police have arrested a suspect from the spot.

In a tweet, Colorado Governor Jared Polish expressed his condolences. “I pray for the families of the victims in this time of mourning and grief,” he said.

Sun News