Abundant Life Christian School shooting latest: Motive under investigation

Officials are trying to figure out why a 15-year-old girl allegedly opened fire at her school, Abundant Life Christian School, on Monday, killing a fellow student and teacher in a heinous crime that shocked the community of Madison, Wisconsin.

The suspect, Natalie Rupnow, who went by Samantha, died from a self-inflicted gunshot wound, police said. Officers did not fire their weapons.

Two students were hospitalized in critical condition with life-threatening injuries, police said, while another three students and a teacher suffered non-life-threatening injuries.

Police have not yet suggested any motive for the attack nor said whether they believe the victims were specifically targeted.

The suspect's parents are cooperating with the investigation, Madison Police Chief Shon Barnes told ABC News on Tuesday.

"They were cooperative. Despite this tragedy, they still lost a child. They still lost a member of their family," Barnes said. "It is certain that they have probably more questions than anyone because they knew her. They lived with her and so we wanted to get an account from them of what kind of child she was."

Her father is being questioned by investigators, Barnes said. He said he didn’t know whether the mother had been questioned, noting that she’s been out of town.

Students in kindergarten through 12th grade attend the Christian school. Police said the shooting was in a classroom during a study hall "full of students from multiple grade levels."

"I was in the hallway, and I was changing from my shoes to my boots to go to lunch because I have recess after, but then I heard the shooting and screams," a girl in second-grade told Chicago ABC station WLS.

A second-grader also made the 911 call, Barnes said.

"Let that soak in for a minute," Barnes added. "A second-grade student called 911 at 10:57 a.m. to report a shooting at school."

In the wake of Monday's shooting, President Joe Biden and Vice President Kamala Harris are urging elected officials to combat gun violence.

Biden in a statement called the shooting "shocking and unconscionable," and he mentioned his administration's efforts to combat the gun violence epidemic in the U.S., including the implementation of the White House Office of Gun Violence Prevention.

Biden asked Congress to pass "commonsense" gun safety laws, including universal background checks, a national red flag law, and a ban on both assault weapons and high-capacity magazines.

"It is unacceptable that we are unable to protect our children from this scourge of gun violence," Biden said, adding, "We cannot continue to accept it as normal."

"It’s another school shooting, another community being torn about and torn apart by gun violence," Vice President Kamala Harris said in remarks Tuesday. "And of course, our nation mourns for those who were killed, and we pray for the recovery of those who are injured and for the entire community."

Harris, who played a role in the Biden administration's efforts to combat gun violence, stressed, "We as a nation must renew our commitment to end the horror of gun violence, both mass shootings and everyday gun violence that touches so many communities in our nation."

"We must end it, and we must be committed to have the courage to know that solutions are in hand, but we need elected leaders to have the courage to step up and do the right thing," she said.

ABC News’ Briana Stewart and Molly Nagle contributed to this report.