The student spent three months planning his attack, starting a diary on his computer in September 2013 to detail his plans. There he wrote that he wanted to choose a day during final exams so that the largest number of students would be present.
NCIER®
2013 attacker planned three months in a diary, targeting final exams
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APA
U.S. Secret Service National Threat Assessment Center. (2018). Enhancing School Safety Using a Threat Assessment Model: An Operational Guide for Preventing Targeted School Violence (p. 19). Claim p019-12, NCIER Claim Map. https://www.ncier.org/research/claim-maps/k12-threat-assessment-model/claims/p019-12
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U.S. Secret Service National Threat Assessment Center. (2018). Enhancing School Safety Using a Threat Assessment Model: An Operational Guide for Preventing Targeted School Violence (p. 19). Claim p019-12, NCIER Claim Map. <a href="https://www.ncier.org/research/claim-maps/k12-threat-assessment-model/claims/p019-12">https://www.ncier.org/research/claim-maps/k12-threat-assessment-model/claims/p019-12</a>Link to https://www.ncier.org/research/claim-maps/k12-threat-assessment-model/claims/p019-12 from your own pages; it resolves to this claim and its highlighted source passage.
License: CC BY 4.0. Free to reuse with attribution: credit NCIER Claim Map and link to the claim.
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