A gun-toting young student at a Christian school in Madison Wis., shot dead two people on Dec. 16, police said. The juvenile shooter then killed themself, authorities said. The gunfire broke out just before 11 a.

Madison police learned of a mass shooting at a private school Monday from a second grader who called 911 for help.

The girl also wounded six others in Monday’s shooting at Abundant Life Christian School, authorities say, including two students who were in critical condition.