MADISON, Wis. — The shooter who killed a student and teacher at a religious school in Wisconsin brought two guns to the school and was in contact with a man in California who authorities say was planning to attack a government building, according to authorities and court documents that became public Wednesday.

Police were still investigating why the 15-year-old student at Abundant Life Christian Christian School in Madison shot and killed a fellow student and teacher on Monday, before shooting herself, Madison Police Chief Shon Barnes said. Two other students who were shot remained in critical condition on Wednesday.

“We may never know what she was thinking that day, but we we’ll do our best to try to add or give as much information to our public as possible," Barnes said.

A California judge, meanwhile, issued a restraining order Tuesday under California’s gun red flag law against a 20-year-old Carlsbad man. The order requires the man to turn his guns and ammunition into police within 48 hours unless an officer asks for them sooner because he poses an immediate danger to himself and others.

According to the order, the man told FBI agents that he had been messaging the Wisconsin shooter about attacking a government building with a gun and explosives. The order doesn't say what building he had targeted or when he planned to launch his attack. It also doesn't detail his interactions with Rupnow except to state that the man was plotting a mass shooting with her.

Police, with the assistance of the FBI, were scouring online records and other resources and speaking with her parents and classmates in an attempt to determine a motive for the shooting, Barnes said.

Police don't know if anyone was targeted in the attack or if the attack had been planned in advance, the chief said.

“I do not know if if she planned it that day or if she planned it a week prior,” Barnes said. “To me, bringing a gun to school to hurt people is planning. And so we don’t know what the premeditation is.”

While the shooter had two handguns, Barnes said he does not know how she obtained them and he declined to say who purchased them, citing the ongoing investigation.

No decisions have been made about whether shooter's parents might be charged in relation to the shooting, but they have been cooperating, Barnes said.

Online court records show no criminal cases against her father, Jeffrey Rupnow, or her mother, Mellissa Rupnow. They are divorced and shared custody of their daughter, but she primarily lived with her father, according to court documents. Divorce records indicate that the shooter was in therapy in 2022, but don’t say why.

The school shooting was the latest among dozens across the U.S. in recent years, including especially deadly ones in Newtown, Connecticut; Parkland, Florida; and Uvalde, Texas.

But it stands out because school shootings by teenage females have been extremely rare in the U.S., with males in their teens and 20s carrying out the majority of them, said David Riedman, founder of the K-12 School Shooting Database.

Emily Salisbury, an associate professor of social work at the University of Utah, studies criminology and gender. She said that females typically turn their anger on themselves because American culture has taught them that women don’t hurt people, resulting in eating disorders, self-harm and depression. It’s difficult to speculate without knowing all the facts in the suspect's case, Salisbury said, but a girl resorting to the level of violence she displayed suggests she experienced severe trauma or suffered violence herself.

“It takes more provocation, more instigation for girls and women to become violent,” Salisbury said. “It’s a very high probability she experienced some sort of violence in her life that can lead to serious mental illness.”

Abundant Life is a nondenominational Christian school — prekindergarten through high school — with approximately 420 students.

Salisbury said the public shouldn’t assume that the school’s religious teachings mean its students are above bullying and ostracizing each other.

“They’re children,” Salisbury said. “As much as those [religious] values may be taught or discussed in the classroom in the culture of that school, kids are online all the time. Kids create their own culture through social media.”

Madison Police have shared a facts and questions page regarding the shooting. You can find that, here.