Two men were shot dead at a Walmart store in Colorado on Wednesday (Nov 1) evening, police said, in the latest case of United States gun violence.
About an hour later they said it was "NOT an active shooter" situation.
Police said Ostrem walked into the south doors of the Walmart store at 9900 Grant St. around 6:10 p.m. Wednesday and "nonchalantly" opened fire.
Thornton police are searching for 47-year-old Scott Ostrem, who they say fled in a vehicle before officers arrived.
A police spokesman said: "This is a very heinous act", a police spokesman said.
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Avila says police received an anonymous tip that led them to the apartment, which is about 5 miles (8 kilometers) from the Walmart store where the shooting took place late Wednesday.
"We've got multiple parties down, we're still trying to ascertain what their conditions are", Officer Victor Avila of the Thornton Police Department told Reuters.
Police are conducting a sweep of both the store and the surrounding parking lot.
A spokesman for the Thornton Police Department could not be immediately reached by AFP. "Customers were screaming. They were running like insane, and I ran out too because I didn't want to get killed", he said.
Customers and employees hid or fled toward the exits after gunshots rang out in Thornton, a suburb of Denver.