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.

A 15-year old female student has been identified as a key suspect with police waiting for hours to release more information.