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A shooting at a Colorado supermarket killed multiple people Monday, including a police officer, and a suspect was in custody, authorities said.

Boulder police Cmdr. Kerry Yamaguchi said at a news conference that the suspect was being treated but didn’t give more details on the shooting or how many people were killed. Officers escorted a shirtless man with blood running down his leg out of the store in handcuffs but authorities would not say if that was the suspect.

Boulder County District Attorney Michael Dougherty said authorities know how many people were killed and suggested they are not releasing the number because they need to notify families of the victims.

Yamaguchi said police were still investigating and didn’t have details on motive.

A man who had just left the store in Boulder, Dean Schiller, told The Associated Press that he heard gunshots and saw three people lying face down, two in the parking lot and one near the doorway. He said he “couldn’t tell if they were breathing.“

Video posted on Youtube showed one person on the floor inside the King Soopers store and two more outside on the ground, but the extent of their injuries wasn’t clear. What sounds like two gunshots are also heard at the beginning of the video.

One person was taken from the shooting scene to Foothills Hospital in Boulder, said Rich Sheehan, spokesman for Boulder Community Health, which operates the hospital. Sheehan said he could not provide additional details but did say that “we have been notified we will not be receiving any additional patients.”

Law enforcement vehicles and officers massed outside the store, including SWAT teams, and at least three helicopters.