The Bureau of Alcohol, Tobacco, Firearms and Explosives is still trying to trace the handgun. ATF agents have told the Deseret Morning News it was initially purchased out of state and changed hands several times. Burbank said police are still running down leads, including looking into some tips that Talovic may have been seen at local shooting ranges.

Items detectives seized from Talovic's car and home have given them no answers.

"We seized everything we could under the premise that in similar circumstances there are things like videos, books, writings, those type of things," Burbank said. "We've kind of come up with a dead end on that portion."

Police and FBI agents are relying heavily on interviews to help them reach any conclusions. Burbank acknowledged even those are providing little new information.

"It is a little frustrating. You would think that if somebody is going to do something that drastic, there would be some significant tell-tale signs of why he would do what he did," he said.

At some point, the chief said investigators will draw every conclusion they're able to and release the results. While the case will be technically closed, Burbank said detectives will still keep an open mind to any clues that lead them to a motive.

"He is a young man that was obviously disturbed," Burbank said. "That's apparent by his actions."

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E-mail: bwinslow@desnews.com