ABC News(LITTLETON, Colo.) When 12 students and one teacher were gunned down in a mass shooting at Columbine High School in 1999, the tragic event marked a turning point for America.Twenty five years later, some survivors recall how they have dealt with the physical and mental impact of PTSD, anxiety and depression."It s a big part of my identity and who I am and not necessarily that day, but more who I ve become," Heather Martin, a Columbine survivor, told ABC News Live. "And a large part of that is because of the aftermath overcoming."America endured school shootings before Columbine, but never one quite like the April 20, 1999, shooting."We didn t have any context for a school shooting, couldn t name a school shooting," teacher Kiki Leyba a survivor, said.According to an ABC News review of the Gun Violence Archive, a website that tracks all shootings in the United States, 415 people have been killed in school shootings since the Columbine attacks. As
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