The attack took place on Wednesday evening in the suburban Denver store and the gunman was still at large, the New York Times reported.
The police released a photograph of a middle-aged white man in a black jacket leaving the Walmart in the city of Thornton.
"It's random as of right now," said a Thornton Police Department spokesman. "The person came in and just shot towards a group."
The spokesman said said that investigators did not know of a motive and said the suspect did not speak before opening fire with a handgun inside the store's south entrance.
Two men were pronounced dead at the scene and a woman later died at a hospital. The police did not find the weapon.
The incident came after Sayfullo Habibullaevic Saipov on Tuesday drove a pickup truck down a busy bike path in New York's Lower Manhattan area, killing eight and injuring 13. He was shot by police and then hospitalised.
US federal prosecutors have filed terrorism charges against Saipov.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.
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