Three people are dead following a shooting rampage at a Colorado Walmart.
According to police, the lone gunman, Ostrem, walked into the Walmart "nonchalantly" and opened fire randomly on a group of people near the cash registers, according to a spokesperson for the Thornton Police Department. Two men were shot and died and a woman who was also shot was taken to the hospital and died soon afterwards.
The Thornton Police Department said on Twitter that Scott Ostrem, 47, had been taken into custody. Police had issued a warrant for his arrest the night before, and received an anonymous tip for his whereabouts.
A motive for the shooting was unknown.
Copter4 flew over the scene of Ostrem's arrest.
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Avila says police went to the apartment and didn't find Ostrem. Thornton Police said they are now reviewing security camera footage and interviewing witnesses "for assistance with suspect (s) description/info". Avila said there was no indication the shooting was an act of terrorism and no one had claimed responsibility.
"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. Authorities used security video to help identify the suspect. Authorities have not yet released information on victims' identities.
After an hour of fire, Thornton Police tweeted that the place is out of danger now when the Walmart was surrounded by police and fire crews.
"The employees started screaming and the customers started screaming" as people began to flee, he said.
Customers and employees hid or fled toward the exits after gunshots rang out in Thornton, which is a suburb of Denver.