"From what we have right now it appears to be random. It's a crazy world we live in." Avila said.

"He walked in very nonchalantly with his hands in the pockets, raised a weapon and began shooting. Then he turns around and walks out of the store."

Avila confirmed that Ostrem had minor criminal history.

The Denver Post reported that court records show Ostrem was arrested in 2013 for driving while impaired and filed for bankruptcy two years later.

Avila also explained why it cost policemen 5 hours after the shooting to find out that the suspect was still at large, saying officers must keep safety of other people at the scene first, and then check the monitors' footage and use database to identify who is the shooter.

The Denver Post cited Avila's words as saying that when the gunman opened fire, most of shoppers inside the supermarket screamed and ran for cover, but others pulled out their own handguns.

There was no exchanging fires between the gunman and shoppers, but those who drew weapons delayed the investigation since authority had to identify the real assailant and make sure there was no more shooter.

The shooting incident triggered a new wave of advocate for gun control on social media.

A user named NyxSea tweeted "this is how mass shootings have become normal in the US. When I read that there was 1 death #ThorntonWalmartShooting I said thank God."

"Thank God it was only 1 death, There should be no death #ThorntonWalmartShooting. What to do about guns?" he retweeted three minutes later.

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