article_snippet: student Karl Pierson had intended to target debate coach Tracy Murphy (right)
article_snippet: This comes following criticism last year that Colorado school district did not act on warnings that they received indicating that student Karl Pierson was dangerous.
article_snippet: Prior to the attack, student Karl Pierson was identified as a potential threat and in school documents it was revealed that administrators were aware student had the emotional capacity to carry out a plan to murder a teacher he was upset with, according to KDVR.
article_snippet: And police later revealed that Karl had intended to target Karl debate coach Tracy Murphy - months after Karl had already shouted a death threat against the coach in a school hallway.
article_snippet: On December 13, 2013, 18-year-old Pierson, armed with a shotgun, ammunition strapped to Karl body, Molotov cocktails and a machete, entered the school and headed toward the library, seemingly intent on killing Mr Murphy.
article_snippet: On December 13, 2013, 18-year-old Pierson, armed with a shotgun, ammunition strapped to Karl body, Molotov cocktails and a machete, entered the school and headed toward the library, seemingly intent on killing Mr Murphy (above Law enforcement officers escort students, with Law enforcement officers hands raised, out of Arapahoe High School on December 13, 2013)
article_snippet: Pierson threw one of the petrol bombs into the library where Mr Murphy, who is also the school's librarian, worked.
highlights_snippet: On December 13, Pierson, 18, armed with a shotgun had intended to target Arapahoe High school debate coach Tracy Murphy .
  