Hundreds of emergency responders ringed the Thornton Town Centre shopping complex for hours after the shooting was reported around 5 am IST. The Walmart is part of the centre.
"Shooting just occurred at Walmart, 9900 Grant St, multiple parties down. Please stay away from the area," Thornton Police Department said in a tweet.
A large number of police vehicles were seen in the parking lot of the Walmart. No other details were immediately available.
Local news channels said a few ambulances were rushing to the Walmart, describing the scene as "chaotic".
A press conference by the police department was expected soon when the report last came in.
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