April 20, 1999 Massacre at Columbine high school FEATURED The victims of the Columbine massacre (Photo: Associated Press) Post author By Phil Gurski Post date April 19, 2021 No Comments on April 20, 1999 Massacre at Columbine high school FEATURED By Phil Gurski Phil Gurski is the President and CEO of Borealis Threat and Risk Consulting Ltd. Phil is a 32-year veteran of CSE and CSIS and the author of six books on terrorism. View Archive → Leave a Reply Cancel replyYou must be logged in to post a comment.