Police in Colorado say multiple people have been shot at a Walmart.
"This is a very heinous act", said Avila.
Court records show a resisting arrest charge against Ostrem was dismissed in 1999.
Two men died after a gunman opened fire inside the store in Thornton, Colorado, on Wednesday night. "We don't know exactly what the motive of the person was, but it was certainly a bad act".
Thornton police are searching for Scott Ostrem, 47, who they say fled in a auto before officers arrived.
Police spotted the vehicle and followed it, eventually stopping Ostrem in his Mitsubishi Mirage and taking him into custody.
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Two men died inside the Walmart, which is about 10 miles (16 kilometers) north of Denver in a busy shopping center. A little more than an hour later, they tweeted that there was not an active shooter "at this time".
Police are conducting a sweep of both the store and the surrounding parking lot.
He says the motive is unknown. Authorities used security video to help identify the suspect.
Customers and employees hid or fled toward the exits after gunshots rang out in Thornton, a suburb of Denver. No information has been released about the circumstances of the shooting or who was responsible for the gunfire.
A spokesman for the Thornton Police Department could not be immediately reached by AFP.