· columbine was a major school shooting on at columbine high school in littleton, colorado. History until december 2012. [d][e] it is still … The columbine massacre was the deadliest mass shooting at a k–12 school in u. s. · on , eric harris and dylan klebold killed 12 fellow students and one teacher at columbine high school in littleton, … · columbine high school shootings, massacre that occurred on , at columbine high school in littleton, colorado, … · the facts about the columbine high school shooting of april 20,1999 from the oldest columbine archive. Information and …
