Motive Unknown in Walmart Shooting That Killed 3 People

The suspect in the Walmart shooting

The suspect in the Walmart shooting

The seemingly random shooting Wednesday in Thornton, Colorado comes a month after a gunman killed 58 people in Las Vegas, the deadliest mass shooting in recent USA history.

The suspect was identified Thursday morning as 47-year-old Scott Ostrem, who was arrested near his home after Thornton Police received a tip from an observant citizen. InsideEdition.com's Leigh Scheps (http://twitter.com/LeighTVReporter) has more. Police also released a second photograph of a red hatchback they believed Ostrem fled in.

Court records show a resisting arrest charge against Ostrem was dismissed in 1999. Police said Ostrem walked into the south doors at the Walmart located at 9900 Grant St. around 6:10 PM Wednesday and "nonchalantly" began firing.

"We don't know exactly what the motive of the person was, but it was certainly a bad act".

Police say the three victims who died, were the only people who were shot during the incident.

Police said the fatalities were two men and a woman. Authorities used security video to help identify him.

Avila says police went to the apartment and didn't find Ostrem.

Suspect sought after shooting at University of Utah
Brophy said police believe Austin Boutain had killed the driver of a vehicle and fled the scene. An extensive search of upper campus and the hills above Red Butte Canyon is still on going.

Thornton Police said Wednesday night that the motive for the shooting remains under investigation.

"We had to discern what exactly was going on, whether that was a suspect or a citizen wondering what was going on and concerned by the sound of gunshots", Avila said.

"Detectives now reviewing security footage & witnesses being interviewed for assistance with the suspect (s)", police said on Twitter.

Police are asking anyone with information about Ostrem's whereabouts to come contact authorities.

"The shooting happened inside the store", said officer Victor Avila.

"The employees started screaming".

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