Police uncovered a shotgun with ammunition, fireworks, and an arsenal of other materials for making bombs at the teen’s home in Thurmont, Maryland.
They say 18-year-old Nichole Cevario, a Catoctin High student, intended on carrying out an attack at the high school. Police say Cevario had been planning the attack for months.
“There is no doubt in our minds that we averted a disaster up there,” said Charles Jenkins of the Frederick County Sheriff’s Office.
Police say Cevario’s father foiled his daughter’s deadly plot after he found her diary which listed details of the attack, including a date next week she planned on carrying it all out.
Investigators say the teen had also recorded the school’s emergency procedures, and had specifically referenced the Sandy Hook and Columbine massacres.