MADISON, Wis. (WFRV) - A teacher and a teenage student were killed in a shooting at the Abundant Life Christian School in Madison, Wisconsin, police said Monday afternoon. Six others were injured and being treated at the hospital, including two students who were in critical, life-threatening condition. "But these are just the physical injuries we know about," said Madison Police Chief Shon F. Barnes. "There will be other injuries that we have to face for a very, very long time." During an earlier press conference, police initially said five people had been killed. However, they later clarified that was a mistake. Police received a call from the school reporting an active shooter just before 11 a.m. on Monday. When officers arrived, they found multiple gunshot wound victims. The suspected shooter was dead when they arrived, Barnes said. He said officers not fire their weapons when they rushed into the school. Barnes suggested the shooter died by suicide. “They found the person responsible who was down, deceased," the chief said. The shooter was a 17-year-old female student, a law enforcement official told The Associated Press. The official was not authorized to discuss the ongoing investigation and spoke to the AP on the condition of anonymity. Police recovered a handgun at the scene, Barnes added. With a few rare exceptions, a 17-year-old can't legally possess a gun in Wisconsin. Authorities said the investigation is active and ongoing. Emergency vehicles are parked outside the Abundant Life Christian School in Madison, Wis., where multiple injuries were reported following a shooting, Monday, Dec. 16, 2024. (AP Photo/Scott Bauer)Emergency vehicles are parked outside the Abundant Life Christian School in Madison, Wis., where multiple injuries were reported following a shooting, Monday, Dec. 16, 2024. (AP Photo/Scott Bauer)Emergency vehicles are parked outside the Abundant Life Christian School in Madison, Wis., where multiple injuries were reported following a shooting, Monday, Dec. 16, 2024. (AP Photo/Scott Bauer)Emergency vehicles are parked outside the Abundant Life Christian School in Madison, Wis., where multiple injuries were reported following a shooting, Monday, Dec. 16, 2024. (AP Photo/Scott Bauer) Investigators did not immediately know a motive for the shooting, Barnes said. “I don’t know why, and I feel like if we did know why, we could stop these things from happening,” he said. Barnes said detectives were, “working hard to find as many answers as we can.” Abundant Life Christian School has 420 students from kindergarten to 12th grade, according to school administrators. This was the last week of school scheduled for the year ahead of the Christmas vacation. In a statement, President Joe Biden cited the tragedy in calling on Congress to pass universal background checks, a national red flag law and certain gun restrictions. “We can never accept senseless violence that traumatizes children, their families, and tears entire communities apart,” Biden said. Wisconsin Gov. Tony Evers said it's “unthinkable” that a child or teacher would go to school and never return home. It was the latest among dozens of school shootings across the U.S. in recent years, including especially deadly ones in Newtown, Connecticut; Parkland, Florida; and Uvalde, Texas. The shootings have set off fervent debates about gun control and frayed the nerves of parents whose children are growing up accustomed to doing active shooter drills in their classrooms. But school shootings have done little to move the needle on national gun laws. Firearms were the leading cause of death among children in 2020 and 2021, according to KFF, a nonprofit that researches health care issues. The Associated Press contributed to this report.