There are "(3) confirmed dead," the Thornton Police Department said on Twitter, raising an earlier toll after a woman whom it earlier announced was transported from the scene died.

"There is currently NO one in custody," said the department, appealing for "anyone with information" to call. 

Last month, a gunman in Las Vegas killed 58 people in the country's worst mass shooting in recent history.

More than 33,000 gun-related deaths occur annually in the United States, according to a study released this month.

Thanks to @NRA lobbyists and lawmakers beholden to them, THIS is what America looks like. THIS is every city, every day.

Colorado Walmart pic.twitter.com/TgVgstLqBT

— Shannon Watts (@shannonrwatts) November 2, 2017

While US politicians are quick to enact sweeping policies, including military action, in response to "terrorism" attacks, authorities have taken little concrete action to address the far-deadlier epidemic of domestic gun violence.

The inaction is largely due to the powerful National Rifle Association gun lobby -- and Republicans who rely on it for funding and other support -- categorically rejecting gun control measures.

Another shooting, this time in a Colorado Walmart.

No thoughts.

No prayers.

Just utter DISGUST at the cowardice keeping NRA in business. pic.twitter.com/BH3OyxTP9c

— BrooklynDad_Defiant! (@mmpadellan) November 2, 2017

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