School Violence in USA

A man killed his wife along with 30 elementary kids using bombs along with 8 other victims.
http://upload.wikimedia.org/wikipedia/commons/f/f8/Bath_Consolidated_School.jpg

Two students and one teacher killed, one other wounded when 14-year-old Barry Loukaitis opened fire on his algebra class.
http://www.murderpedia.org/male.L/images/loukaitis_barry/loukaitis_002.jpg

Four students and one teacher killed, ten others wounded outside as Westside Middle School emptied during a false fire alarm. Mitchell Johnson, 13, and Andrew Golden, 11, shot at their classmates and teachers from the woods.
http://www.johnmonty.com/cotw/arkiller.jpg

One student killed in the parking lot at Lincoln County High School three days before he was to graduate. The victim was dating the ex-girlfriend of his killer, 18-year-old honor student Jacob Davis.
http://murderpedia.org/male.D/images/davis_jacob/davis-011.jpg

Two students killed, 22 others wounded in the cafeteria at Thurston High School by 15-year-old Kip Kinkel. Kinkel had been arrested and released a day earlier for bringing a gun to school. His parents were later found dead at home.
http://www.cbsnews.com/2302-201_162-0.html

14 students (including killers) and one teacher killed, 23 others wounded at Columbine High School. Eric Harris, 18, and Dylan Klebold, 17, had plotted for a year to kill at least 500 and blow up their school. At the end of their hour-long rampage, they turned their guns on themselves.
http://blog.cleveland.com/nationworld_impact/2009/04/large_Columbine-shooters-Apr20-1999.jpg

One teacher, Barry Grunow, shot and killed at Lake Worth Middle School by Nate Brazill, 13, with .25-caliber semiautomatic pistol on the last day of classes.
http://projets.rsight.net/Supercolumbine/Fort_worth_files%20/Grunow_Heading_01_B.jpg

James Sheets, 14, killed principal Eugene Segro of Red Lion Area Junior High School before killing himself.
http://extras.mnginteractive.com/live/media/site515/2008/1011/20081011__web_101108-jp-segro-run_500.jpg

A 15-year-old student shot and killed Weston School principal John Klang.
http://shemovesinherownway91.files.wordpress.com/2012/09/cartoon326large.jpg

This was the deadliest gun massacre by a single man in U.S. History. 32 were killed and 17 were wounded.
http://upload.wikimedia.org/wikipedia/en/a/a2/ChoSh.jpg