A statement from police said 2 males were deceased and one woman was taken to a hospital. A little more than an hour later, they tweeted that there was not an active shooter "at this time".
Police say a man suspected of fatally shooting three people inside a suburban Denver Walmart tried to flee officers in his vehicle but was blocked by traffic.
Police are conducting a sweep of both the store and the surrounding parking lot. He is still at large and police are trying to identify him with video footage.
It happened at 9900 Grant Street in Thornton early Wednesday evening.
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He says the motive is unknown.
Two men died after the gunman opened fire in the store in Thornton, Colorado on Wednesday night. "Screaming and screaming, and my biggest fear is we're all bunched up there and this guy, who knows where he is, could come and just starting shooting people". "I ran out, too, because I didn't want to get shot".
Customers and employees hid or fled toward the exits after gunshots rang out in Thornton, which is a suburb of Denver.