At least two people were killed Wednesday night during a shooting at a Walmart in the Denver, Colorado, suburb of Thornton, police said on Twitter.
The Thornton Police Department said one woman was taken to a hospital.
It was unclear whether anyone was in custody, but police said it was not an active shooter situation.
Video from CNN affiliates showed a Walmart Supercenter parking lot filled with emergency vehicles.
Thornton is just north of Denver.