parent found and took to police, foiling a plot to replicate the columbine massacre. two 15-year-olds have been charged as adults, two more as juveniles for their role in a conspiracy to carry out a mass casualty attack on dunmother high school. dunmore high school on columbine s 25th anniversary when two student shooters killed 12 class a mates and 1 teacher in colorado classmates. this pennsylvania is community is horrified by what could have been. i was like, no,ment isn t be real. it s terrible for 15-year-olds to actually plan on murdering people it s just beyond. reporter: according to our fox affiliate, the group planned to, quote, shoot up the school and specifically target three faculty members. a search of one home uncovered a stockpile of homemade explosives, plans for making pipe bombs, a list of guns and ammo needed and writings on