Barnes said Tuesday identifying Rupnow’s motive is a top priority and that it appears to be a “combination of factors,” but declined to provide more information.
Authorities also said Rupnow had been in contact with a 20-year-old man in Carlsbad, California, who was plotting a mass shooting with the teenager and told her he was planning to attack a government building, the AP reported, citing court documents.
CNN has reached out to Carlsbad police and the FBI for information.
Rupnow’s parents are cooperating with police, Barnes said, as more details about the teen’s home life come to light. Court records obtained by CNN show Rupnow’s parents have been married to each other and divorced from each other twice, with court orders requiring the teen to split time between her mother’s home and her father’s.
It’s unclear whether Rupnow’s parents owned or possessed the gun used in the shooting, Barnes told CNN. Police, along with the district attorney’s office, will “want to look at if the parents may have been negligent,” he said.
Rupnow’s parents – Jeff and Mellissa Rupnow – have not responded to CNN’s repeated requests for comment.
Police are also talking to students to determine whether bullying was one of the factors, he said, and investigators are looking through the online presence of the shooter to try to learn new information.
Previously:
15-Year-Old Girl Identified as the Shooter in a Wisconsin School
Ms. Cat’s Chronicles 
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