An unidentified gunman opened fire at a Walmart store in the US state of Colorado today, killing three persons including a woman.
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.
"Multiple parties" were down, Thornton police said in a tweet.
An hour later, the Thornton Police Department tweeted, "At this time this is not an active shooter".
The men died at the store, and the woman died at a hospital.
No arrests have been made.
Aaron Stephens, 44, was in the self-checkout line at the Walmart when he heard a single shot followed by two more bursts of gunfire before people started running for the exits.
"The employees started screaming. Customers were screaming. They were running like crazy, and I ran out too because I didn't want to get killed," he said.
Investigators, who have not released any details about the circumstances of the shooting, were reviewing security footage and interviewing witnesses to get a description of the shooter.
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