Reposting this article with information on the weapons.
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Police said Westman bought the weapons lawfully and they were "purchased recently."
At the scene of the crime, three shotgun shells were recovered, along with 116 rifle rounds. One live round of ammunition was recovered from a hand gun that appeared to malfunction while the shooter was using it, police said.
Additional firearms are also being recovered from the residences that are "related to the shooter," police said. No explosives were discovered at the scene, but a "smoke bomb" was located by officials, police said.
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Officials have identified the suspect who they say opened fire outside of a church at a Catholic school in Minneapolis, killing two children and injuring 18 others.
abcnews.go.com