Authorities in Madison, Wisconsin, on Monday identified the teenage student who opened fire at a private Christian school, killing two people and injuring several others.

Madison Police Chief Shon Barnes said 15-year-old Natalie Rupnow, who went by Samantha, was responsible for the shooting at Abundant Life Christian School. Evidence suggests the teenager died by a self-inflicted gunshot wound, although the official cause of death had yet to be released by the Dane County Medical Examiner’s Office late Monday.

Law enforcement arrived at the school at 11 a.m., three minutes after receiving a 911 call from a second-grade student, police said.

Two victims were killed – a teacher and teenage student – while six others – five students and a teacher – were injured, authorities said. Two students who were listed in critical condition, police said. Three students and a teacher were hospitalized with non-life-threatening injuries, police said.

Two of those people had been released from the hospital as of Monday evening.

Barnes said the shooting was confined to a classroom, where a study hall consisting of students in various grades was taking place. A handgun was recovered at the scene.

Detectives were in the process of interviewing witnesses and obtaining search warrants as police “worked to find out as many answers as we can,” the chief said.

The shooter’s family was cooperating with investigators following the shooting, the police chief said.

“Please understand, there are many things that we cannot share with you right now,” County Executive Melissa Agard said. “This is an active investigation. This is an active case.”

In the hours following the shooting, a reunification center was set up at the nearby SSM Health Dean Medical Group, 1821 S. Stoughton Rd.

MORE: What we know so far about Abundant Life Christian School shooting in Madison, Wisconsin

Madison Mayor Satya Rhodes-Conway, speaking at a news conference, offered condolences to victims and their families, who support will be provided to in the days ahead.

“This is an incredibly sad day for our community,” the mayor said. “As you’ve heard, there is no danger to our community at this time, but our entire community has been impacted by this tragic incident.”

Rhodes-Conway urged anyone who needs mental health support as a result of the shooting and the ensuing coverage to reach out to 988 — the Suicide and Crisis Lifeline — by phone or text.

“It is incredibly important that we take care of our community in this very difficult time,” she said. “We all have a role in preventing gun violence. Our entire community needs to be part of the solution here.”

The other person deceased was the suspected shooter, according to the Madison Police Department.

This story has been updated to reflect the Madison Police Department’s latest information on the number of victims.