Connecticut school shooting: America's worst school shootings March 24, 1998: Mitchell Johnson, 10, and Andrew Golden, 8, pulled a fire alarm and began shooting as everyone exited a school in Jonesboro, Arkansas, killing four students and one teacher and injuring nine others. April 20, 1999: Eric Harris, 18, and Dylan Klebold, 17, walked into Columbine High School in Colorado and in a rampage of gunfire and homemade bombs killed 12 students and a teacher and then themselves. March 21, 2005: Jeffrey Weise, 17, went on a shooting spree at Red Lake High School on the Red Lake Indian Reservation in Minnesota. He killed nine people, including his grandfather, and wounded five others before killing himself. Oct 2, 2006: Charles Carl Roberts IV, 32, a milk-van driver, killed five girls ages 7 to 13 execution-style, then turned the gun on himself, in a one-room Amish schoolhouse in Nickel Mines, Pennsylvania. April 16, 2007: Seung-Hui Cho, 23, a student at Virginia Tech University in Blacksburg, Virginia., shot and killed 32 people in attacks two hours apart in two campus buildings. Cho, who was diagnosed with mental illness, killed himself. April 2: One L Goh, 43, a former nursing student at private Oikos University in California, sprayed gunfire around a classroom, killing seven people.