What is Columbine High School massacre?
{{Infobox civilian attack |title = Columbine High School massacre {{Location map | USA Colorado # USA | float = center | width = 250 | label = Columbine | background = | coordinates = {{coord|39.603333|-105.074722}} }} |location = [[Littleton, Colorado]], U.S. |coordinates = {{Coord|39|36|12|N|105|04|29|W|region:US-CO_type:event|display=inline,title}} |target = Students and staff at [[Columbine High School]]; and [[first responders]] |date = {{start date and age|1999|04|20}} |time = {{nowrap|11:19&nbsp;am – 12:08&nbsp;pm}} |timezone = [[Mountain Time Zone|MDT]] ([[UTC−06:00|UTC−6]]) |type = [[School shooting]], [[mass murder]], [[murder–suicide]], [[arson]], [[improvised explosive device|attempted bombing]], [[shootout]], [[terrorism]] |fatalities = 15 (including both perpetrators) |injuries = 24 (21 by gunfire) |perps = [[Eric Harris and Dylan Klebold|Eric Harris<br />Dylan Klebold]] |weapons = {{bulleted list|[[TEC-9|Intratec TEC-DC9]]|[[Hi-Point Carbine|Hi-Point 995 Carbine]]|[[Savage Arms|Savage 67H pump-action shotgun]]|[[Savage Arms|Stevens 311D double barreled sawed-off shotgun]]|99 [[explosives]]|7 [[knife|knives]] (not used)}}<ref>{{cite web |title=Weapons |url=https://www.acolumbinesite.com/weapon.php |website=A Columbine Site |accessdate=13 May 2019}}</ref> |motive = Unknown, but it looked like Harris had [[psychopathy]], Klebold had [[Major depressive disorder|depression]], and possibly [[terrorism]] }} The '''Columbine High School massacre''' was a [[school shooting]] and [[attempt]]ed [[improvised explosive device|bombing]] at Columbine High School in [[Littleton, Colorado]], near [[Denver, Colorado|Denver]], that happened on April 20, 1999. 18-year-old [[Eric Harris]] and 17-year-old [[Dylan Klebold]] carried out the massacre and were both students at the school. They [[mass murder|murdered 12]] students and one teacher using [[firearm|guns]]. Ten of the [[murder]]s happened in the school's [[library]], where t