German kid killed 16 people
Who: Tim Kretschmer
When: 11/03/09
Where: Winnenden, Germany.
Why : He was a member of the shooting club, he also had a big fascination for guns and knew a lot about them.
What: A student from the school started shooting students and 3 policemen that tried to stop him he also shoot a person that was walking by.

Columbine High School massacre.
Who: Eric Harris and Dylan Klebold
When: 20/04/99
Where: Columbine high school
Why: They built up resentment against the people that lived next to them, then started to have special interest in how to use and make dangerous artefacts.
What: These 2 students killed 12 of their classmates, and injured 23 other people before committing suicide.

Korean senior kills
Who: Seung-Hui Cho
When: 16 /04/07
Where: Virginia
Why: He had anxiety disorders. Then he was declared a mentally ill person for stalking two girls.
What: He killed 32 people and injured many more. Then he committed suicide.

Girl Shoots
Who: Elizabeth Bush
When: 07/03/01
Where: Bishop Neumann, High School in Pennsylvania
Why: she was kind of jealous about her, because she was the head cheerleader, besides they were having a big discussion.
What: She shoot Kimberly Marchese the head cheerleader while they were discussing.

Shooting in “El Cajon”
Who: Jason Hoffman
When: 22/03/01
Where: Granite Hills High School, El Cajon, California
Why: Before this happened he was diagnosed as clinically depressed and that he needed treatment. He declared that he had opened fire in order for a police officer has a reason to kill him.
What: He injured 2 teachers: Priscilla Murphy & Fran Zumwalt, he also injured some classmates: Billy Ditzler, Toby Halstead, Shaunda Hughes, Carina Scribellito, Jennifer Strom, & Andy Yafuso .He suicided after that in 0ctober 29.