As reported by The Associated Press (AP), Madison Police Chief Shon Barnes revealed that investigators are working to understand the reasons behind the attack. “Identifying a motive is our top priority, but at this time it appears that the motive is a combination of factors,” he said.

The shooter used a handgun in the attack, and police are working to determine how she obtained the weapon.

Barnes also confirmed that investigators are examining whether the firearm was owned or possessed by her parents.

“We also want to look at if the parents may have been negligent. And that’s a question that we’ll have to answer with our district attorney’s office,” Barnes said. “But at this time, that does not appear to be the case.”

Investigators believe Rupnow was already inside the school when the attack began and have confirmed that no security breach occurred.

According to the AP, the attack injured six people, including two students currently in critical condition. CNN also reported that a substitute teacher was among the injured, and a full-time teacher was one of the two killed.

When asked if Rupnow deliberately targeted her victims, Barnes said, “We don’t know if there would be a reason to target a (substitute) teacher, in this case, who doesn’t have significant ties to the school.”

Besides talking to Runpow’s parents, police are analyzing her electronic devices, which have been turned over to FBI technicians, to determine if she communicated her plans or warned anyone about the attack. “There are always signs of a school shooting before it occurred. We’re looking into her online activity,” Barnes said.

The tragedy has left the Abundant Life Christian School community in shock. The nondenominational school, serving prekindergarten through high school, has about 420 students.

Outside the school, community members have begun paying tribute to the victims. Mackenzie Truitt, whose brother graduated from Abundant Life, placed a red poinsettia at the entrance. “My heart sunk because I know how awesome a lot of these kids are,” Truitt shared.

As the police continue to investigate the motives behind the Abundant Life Christian School shooting, the grieving community is seeking answers while healing.