The Columbine massacre

On April 20th 1999 a mass shooting in the USA shocked the world and started a devastating trend of violence in American schools. 13 people were killed and more than 20 were injured by two armed school students. Ashley Byrne has been speaking to Craig Scott, who survived the Columbine massacre but whose sister Rachel was killed that day. Photo: Students from Columbine High School run under cover from police, following a shooting spree by two masked teenagers. April 20th 1999. Credit: Mark Leffingwell/AFP/Getty Images.