In Colorado, the mother of a student at STEM School Highlands Ranch says she tried to warn school officials last year about the potential for violence at the Denver-area high school but was ignored. The school was the site of a mass shooting Tuesday, when a pair of students armed with handguns went on a shooting spree, killing 18-year-old student Kendrick Castillo and injuring eight others. CNN reports the mother, who’s remaining anonymous, called the school board in December warning of a crushing academic workload leading to violence, sexual assault and bullying on campus. She said, “[T]hose are the elements that we need for the perfect storm, for something like a Columbine, or some kind of imminent threat to our children’s safety in the school, whether it be a bomb or an active shooter, or a suicide.” STEM school officials disputed the claim and even filed a lawsuit against the unnamed mother in January over what they called “defamatory statements.”