Three dead in brutal Walmart shooting; gunman still at large

A gunman today walked into a Walmart store in Colorado and opened indiscriminate fire, killing three persons including a woman before fleeing in a vehicle, police said.

According to authorities, two men were killed and a woman was taken to a nearby hospital where she later died.

A lone suspect was identified by police as 47-year-old Scott Ostrem.

Ostrem was arrested in north Denver early this morning.

Court records show a resisting arrest charge against Ostrem was dismissed in 1999. Police are warning civilians to consider Ostrem armed and risky.

Neighbors of the man suspected of fatally shooting three people at a suburban Denver Walmart say he was unfriendly and occasionally hostile toward them.

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

Thornton Police said Wednesday night that the motive for the shooting remains under investigation. The call came into dispatch at 6:10 p.m.to report a shooting inside the Grant Street Walmart location, police said.

"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.

An anonymous tipster spotted Ostrem's vehicle not far from his apartment at around 8 a.m. Thursday and notified police, who Avila says were nearly immediately on his tail. Thornton Police said they are now reviewing security camera footage and interviewing witnesses "for assistance with suspect (s) description/info". Authorities used security video to help identify him.

The names of the victims have not been released though Tiffany Wilson, Director of Walmart Communications, did confirm that all Walmart staff has been accounted for. Avila said there was no indication the shooting was an act of terrorism and no one had claimed responsibility. Avila says he doesn't know how many rounds were fired.

"The employees started screaming and the customers started screaming" as people began to flee, he said.