Story highlights Shooting victims identified

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(CNN) The man suspected of killing three people at random inside a Colorado Walmart was arrested Thursday, Thornton police said.

Scott Ostrem, 47, was taken into custody Thursday morning. But it's still not clear why he may have opened fire near a cash register at the Walmart Supercenter Wednesday night, killing two men and a woman.

"We believe as of right now that the shooting was random," Thornton Police Officer Victor Avila said. "There's nothing on motive as of yet."

#thorntonwalmartshooting Arrested: Scott Ostrem, 47, police requesting any video footage associated with the incident, call 720-977-5069 pic.twitter.com/ZCYYuEPt91 — Thornton Police Dept (@ThorntonPolice) November 2, 2017

The victims have been identified as Denver residents Pamela Marques, 52, and Victor Vasquez, 26, and 66-year-old Carlos Moreno of Thornton.

The gunman left the store with the same calm demeanor with which he entered, Avila told CNN affiliate KMGH . The suspect fled the store in a red Mitsubishi Mirage, police said. Authorities searched for him through the night.

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